How to Repair the Automatic Transmission Not Shifting

How to repair the automatic transmission not shifting.

Model: Centennial LZ

Year Model: 2006

Fuel: Gasoline

Displacement: 3500cc

Subject: Automatic Transmission not shifting.

1) Condition

1. Automatic transmission moving on drive position.
2. excessive shock shifting in reverse position.

2) Cause

1. Trans axle Switch.

3) Diagnosis

1. Scan tool check
   = P0705 Transaxle range switch.
   
   The TCM monitors this voltage,which corresponds to the position of the transaxle gear shift lever to determine desired gear and electronic pressure control pressure. The transaxle range switch is located on the top of the transaxle ,and also contains the neutral/start circuit.
2. Check the transaxle range switch service data
   a) connect G_Scan to data link connector.
   b) Check the transaxle range switch output when at its position.
   IS there Continuity? 
   NO or YES=Problem is intermittent check the transaxle control cable.
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     V
3. Check the transaxle range switch connector.
   a)Turn the ignition switch off and disconnect the transaxle range switch connector.
   b) Check that the transaxle range switch connector for loosed, poor connection,bent ,corrosion,contamination, deterioration or damage.
   Is there continuity? 
   YES  or NO= repair or replace as necessary.
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     V
4. Check the transaxle range switch continuity
   1) Disconnect the transaxle range switch connector.
   2) Check for continuity between terminal 3 and terminal 8,9,10 when the shift lever position “ P”
   3) Check for continuity between terminal 7 and terminal 8when set the shift lever position to “R”
   4) Check the continuity between terminal 4 and terminal 8,9,10 When set the shift lever position “N:
   5) Check for continuity between terminal 1 and terminal 8 when set the shift lever position “D”
   6) Check for the continuity between terminal 5 and terminal 8 when set the shift lever position ‘3’.
   7) Check for continuity between terminal 2 and terminal 8  when the shift lever position 2.
   8) Check for continuity between terminal6 and 8 when set the shift lever position” L”
   
   Is there continuity?
   YES        NO= Repair or replace as necessary.
     |
     V
5. Check the transaxle range switch harness.
   1) Turn the ignition switch off and disconnect the transaxle range switch connector.
   2) Turn the ignition switch ON.
   3) Measure the voltage between the transaxle range switch connector terminal 8 and body ground.
   Is there voltage?
   YES         NO=Repair or replace as necessary.
     |
     V
6. Check the transaxle range switch harness
   1)Turn the switch off and disconnect the transaxle range switch connector and TCM connector.
   2) Check the continuity between the transaxle range switch connector terminal 1 and the TCM harness connector terminal D2/C17.
   3) Check the continuity between the transaxle range switch connector terminal 2 and the TCM harness connector terminal D22/C18.
   4) Check the continuity between the transaxle range switch connector terminal 3 and the TCM harness connector terminal D1/C5.
   5) Check the continuity between the transaxle range switch connector terminal 4 and the TCM harness connector terminal D21/C6.
   6) Check the continuity between the transaxle range switch connector terminal 5 and the TCM harness connector terminal D9/C7.
   7) Check the continuity between the transaxle range switch connector terminal 6 and the TCM harness connector terminal D10/C8.
   8) Check the continuity between the transaxle range switch connector terminal 7 and the TCM harness connector terminal D8/C16.
   Is there continuity?
     YES         NO= Repair or Replace as Necessary
       |
       V
7. Replace The TCM
   1) Disconnect the battery (-) terminal and disconnect the TCM connector.
   2) Replace the TCM.
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How to Repair the Automatic Transmission Not Shifting

How to repair the automatic transmission not shifting.

Model: Centennial LZ

Year Model: 2006

Fuel: Gasoline

Displacement: 3500cc

Subject: Automatic Transmission not shifting.

1) Condition

1. Automatic transmission moving on drive position.
2. excessive shock shifting in reverse position.

2) Cause

1. Trans axle Switch.

3) Diagnosis

1. Scan tool check
   = P0705 Transaxle range switch.
   
   The TCM monitors this voltage,which corresponds to the position of the transaxle gear shift lever to determine desired gear and electronic pressure control pressure. The transaxle range switch is located on the top of the transaxle ,and also contains the neutral/start circuit.
2. Check the transaxle range switch service data
   a) connect G_Scan to data link connector.
   b) Check the transaxle range switch output when at its position.
   NO or YES=Problem is intermittent check the transaxle control cable.
     |
   V
3. Check the transaxle range switch connector.
   a)Turn the ignition switch off and disconnect the transaxle range switch connector.
   b) Check that the transaxle range switch connector for loosed, poor connection,bent ,corrosion,contamination, deterioration or damage.
   YES  or NO= repair or replace as necessary.
     |
   V
4. Check the transaxle range switch continuity
   1) Disconnect the transaxle range switch connector.
   2) Check for continuity between terminal 3 and terminal 8,9,10 when the shift lever position “ P”
   3) Check for continuity between terminal 7 and terminal 8when set the shift lever position to “R”
   4) Check the continuity between terminal 4 and terminal 8,9,10 When set the shift lever position “N:
   5) Check for continuity between terminal 1 and terminal 8 when set the shift lever position “D”
   6) Check for the continuity between terminal 5 and terminal 8 when set the shift lever position ‘3’.
   7) Check for continuity between terminal 2 and terminal 8  when the shift lever position 2.
   8) Check for continuity between terminal6 and 8 when set the shift lever position L
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How to Repair the Abnormal Noise Chime Bell During Driving

How to Repair the Abnormal Noise Chime Bell During Driving.
Model: Hyundai Azera (TG)

Year Model: 2008

Fuel : Gasoline

Displacement:3300cc

Subject: Abnormal Noise During Driving – Chime bell

1) Condition

1. Abnormal noise comes from the chime bell during driving.

2) Cause

1. Malfunction of ETACSCM.

3) Diagnosis

1. Check the waveforms of the door warning buzzer – Abnormal signal.
2. Inspect the M34 connector #1 terminal signal using GDS oscilloscope – Abnormal waveform(Control line).
3. Replace the ETACS then test the problem gone

4) Parts Replace

1. Replace the ETACS Assembly.

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How to Repair the Heater Blows Cold Air when Warm Air is Expected.

How to repair the heater blows cold when warm air is expected.

 

Model: Hyundai Azera (TG)

Year Model: 2007

Fuel : Gasoline

Displacement: 2700cc

Subject: Heater aspirator hose(heating problem).

1) Condition

1. The HVAC(Heating Ventilation and Air-conditioning) unit blows cold air when warm/hot air is expected.

2) Cause

1. The linked aspirator hose is placed behind the the control panel.
2. The kink in the aspirator hose prevents the in car sensor to detect the cabin air temperature accurately.

3) Diagnosis

1. Remove the center facia  panel and audio.
2. Inspect the aspirator hose condition.
   = If the aspirator is kinked or is not clamped by the weld clip, route the hose properly and clamp the hose with the weld clip then install all removed components
   = If the aspirator hose is kinked permanently replace the hose properly.
3. Removed the heater control panel.
4. Install the new aspirator hose and then clamp the aspirator hose using the weld clip.
5. Reinstall all removed components and check the heater for proper operation

4) Repair Guides

1. Inspect the aspirator hose condition and replace the hose properly.

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How to Repair the Abnormal Tachometer

How to Repair the Abnormal Tachometer
Model: Hyundai Terracan(HP)

Year Model: 2004

Fuel: Gasoline

Displacement: 2500cc

Subject: Abnormal tachometer-Crank Angle Sensor.

1) Condition

1. Intermittent engine stalling.
2. During driving,intermittently the tachometer fails to operate.

2) Cause

= The result of NP sensor connector inspection is revealed that the connector has been in abnormal condition.

3) Diagnosis

1. Scan tool check.
   = Diagnostic trouble code
   a) P1127 – Control sleeve position sensor malfunction.
   b) P0120 =- Accel position sensor malfunction..
   c) P1120 – Electric Governor malfunction.
2. Check the contact of EE04 connector (near the starter) because the present state of DTC related to EE04 is in the trouble code.
3. The poor contact of EE04 connector is found.

4) Parts Repair

1. Repair the GE connector and NP sensor pin.(at the same location beside the starter)

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How to Repair Poor Operation of Speed Meter Gauge

How to repair poor operation of speed meter.

 

Model: Hyundai Grandeur (XG)

Year Model: 2004b

Fuel: Gasoline

Displacement: 3000cc

Subject: Poor operation of speed meter gauge.

1) Condition

1. Speed meter gauge does not operate(Not related to drive speed).

2) Cause

1. The connector pin is pushed during when connecting the VSS signal to install a navigation system.

3) Diagnosis

1. When performing driving test , speed signal is inputted in G-Scan:Normal
   = Vehicle speed sensor: Normal,ECU signal input line: Normal.
2. Actuate the speed meter by force using VSS mode in G-Scan simulator.
   = No change of speed gauge.
3. Inspect the VSS signal of connector after removing the instrument cluster in inspection #2 condition: No signal.
4. When checking the VSS(Vehicle Speed Sensor) signal input wiring a pushed connector wiring is found that connects with passenger compartment junction box.

4) Repair Parts or Replace.

1. Replace the connector pin

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What is the Problem if Engine Hard to Start in Morning

What is the Problem if Engine Hard to Start in Morning.?
How to check of this problem?
Model: Hyundai Sonata (FL).
Year Model: 2010
Fuel: Gasoline
Displacement: 2400cc
Subject: Engine Hard starting especially in the morning.
1) Condition

1. Engine hard starting in morning, at the same time after driving the car and park after a few minute try to start it cannot start immediately.

2) Cause

1. immobilizer key.

3) Diagnosis

1. Scan tool check
   Trouble Code.
   a) P1693 – Immobilizer Transponder.
   
   Almost all Hyundai model are built in with anti theft gadget that what we call immobilizer system. consist of ECM, the SMARTRA3 and the ignition keys with built in transponder.
      The ECM carries out the check of ignition key by especial encryption algorithm with SMARTRA3 and transponder. the encryption algorithm (between ECM and SMARTRA3) is used one offered from Bosch. the encryption algorithm (between ECM and Transponder) is Hitag2 type witch is high level.when ignition ON, the ECM executes the key authentication. The engine can be started in case of the success in SMARTRA3 and key Authentication.
      The Key teaching procedure start with ECM request of pin from scanner. The ‘virgin’ ECM stores the pin and the key learning can be started. the '”learnt” ECM compares the PIN from tester with the vehicle password in transponder. If the data is correct, the learning can be started. Scanner request the learning of the first key, the SMARTRA3 is registered at first and then first key is registered by ECM. If the SMARTRA3 status is learnt and pin number is different , the SMARTRA3 will return the incorrect pin data to the ECM. in this case, the ECM can’t execute the key learning process.
   
2. Observation the key indicator from control takes a second to appear this abnormal. the normal is takes 3 second only.
   
3. Check and reprogram with new key.
   
4. The indicator normalize = Ok

4) Replace Parts

• Immobilizer Key

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What is the Problem if Engine Hard to Start in Morning

What is the Problem if Engine Hard to Start in Morning.?
How to check of this problem?

Model: Hyundai Sonata (FL).

Year Model: 2010

Fuel: Gasoline

Displacement: 2400cc

Subject: Engine Hard starting especially in the morning.

1) Condition

1. Engine hard starting in morning, at the same time after driving the car and park after a few minute try to start it cannot start immediately.

2) Cause

1. immobilizer key.

3) Diagnosis

1. Scan tool check
   Trouble Code.
   a) P1693 – Immobilizer Transponder.
   
   Almost all Hyundai model are built in with anti theft gadget that what we call immobilizer system. consist of ECM, the SMARTRA3 and the ignition keys with built in transponder.
      The ECM carries out the check of ignition key by especial encryption algorithm with SMARTRA3 and transponder. the encryption algorithm (between ECM and SMARTRA3) is used one offered from Bosch. the encryption algorithm (between ECM and Transponder) is Hitag2 type witch is high level.when ignition ON, the ECM executes the key authentication. The engine can be started in case of the success in SMARTRA3 and key Authentication.
      The Key teaching procedure start with ECM request of pin from scanner. The ‘virgin’ ECM stores the pin and the key learning can be started. the '”learnt” ECM compares the PIN from tester with the vehicle password in transponder. If the data is correct, the learning can be started. Scanner request the learning of the first key, the SMARTRA3 is registered at first and then first key is registered by ECM. If the SMARTRA3 status is learnt and pin number is different , the SMARTRA3 will return the incorrect pin data to the ECM. in this case, the ECM can’t execute the key learning process.
2. Observation the key indicator from control takes a second to appear this abnormal. the normal is takes 3 second only.
3. Check and reprogram with new key.
4. The indicator normalize = Ok

4) Replace Parts

• Immobilizer Key

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How to Check Automatic Transmission not Shifting

How to Check Automatic Transmission not Shifting

Model: Hyundai Sonata (YF)

Year Model: 2011

Fuel: Gasoline

Displacement: 2400cc

Subject: Automatic Transmission Shock Shifting.

1) Condition

1. Engine not Cranking Totally Power Block out
2. Automatic Transmission cannot shift to ‘R’ ,’N’ & ‘D’.

2) Cause

1. Engine not cranking totally power block out due to Alternator main fuse busted  cause of battery electric current drain.
2. Automatic transmission cannot shift due to shift lock solenoid not functioning.

3) Diagnosis

1. Recharge battery and visually check all fuses = the main fuse from alternator confirm busted = Replace new fuse.
2. Start the engine and confirm the battery voltage by using GDS or Voltmeter( at the same time i use GDS).
3. Check all the system, lights and gear = confirm the automatic transmission cannot shift.due to shift lock solenoid not working.
4. Check with schematic diagram for shift lock solenoid.
   = From the brake switch check for the power
   disconnect the socket and check, Switch on the key = Ok (B+) 
   = Check the switch = OK
   = Pull out the console box assembly where in the shifting lever mounting under it.
   = Check the wire connector of shift solenoid.
   =Disconnect the socket and check if there is power from brake switch and ground from ECU = Ok
   = Direct with power and ground the solenoid wire to check if this will functioning = No, confirm that solenoid busted.

4) Repair Guide

1. Replace alternator main fuse.
2. Replace shift lock solenoid.

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How to Check if Air bag Warning Light On

How to check if airbag warning light on always.
What may be the cause of airbag indicator light on always.

Model: Hyundai Azera

Year Model: 2009

Fuel: Gasoline

Displacement: 3300cc

1) Condition

1. Esp/Airbag warning light is “On” when driving.

2) Cause

1. Internal fault of steering angle sensor.

3) Diagnosis

1. Scan tool check.
   = Trouble code ( C1260 – Steering Angle Sensor Signal.
   =General Description.
   =The steering angle sensor (SAS) joined to the multifunction switch and using a CAN communication.The SAS is composed of main gear,serve gear 1 and serve gear 2 to determine the turning direction. If main gear is rotated according to the rotation of the steering wheel gear serve 1 serve gear 2, which is contact with main gear, will be rotated.
   =The HECU detects the absolute angle by using magnetic MR effects and the different gear ratio of each serve gear and then send to the  CAN communication line.
   =The HECU detects the steering wheel’s operating wheel speed and operating wheel angle by using absolute angle , and this signal is used as input signal of anti-roll control.
   = If the SAS signal is different from calculated value by Yaw-rate sensor and wheel speed sensor,mechanically impossible  SAS signal is detected , there is a different between SAS signal and driving condition of the vehicle calculated from the Yaw-rate sensor and later G-sensor , a failure is detected.
2. Possible cause.Short of steering angle sensor,Faulty steering angle sensor,Faulty HECU.
3. Current data monitoring
   Steering angle sensor ( 0 ) degrees always.
4. Replace Steering angle sensor. then calibrate with GDS or G-Scan.
   =the problem disappeared.

4) Repair Guides

• Replace with new Steering angle sensor.

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How to Check the Automatic Transmission Hold in 3rd Gear

How to Check the Automatic Transmission Hold in 3rd Gear
Model: Hyundai Santa Fe
Year Model: 2004
Fuel: Diesel
Displacement: 2000cc
Subject: ATM 3rd Gear Hold – Solenoid Valve
1) Condition

1. Automatic transaxle 3rd gear hold during driving.
2. Excessive shock shifting when shifting into the "’R’ position.

2) Cause

1. Solenoid valve connector(# 10 pins) is not fitted completely.

3) Diagnosis

1. Scan tool check
   = Diagnostic trouble code
   1) P0703 = LR Solenoid valve short/ open circuit(LR-low & reverse)
   2) P0743 = DCC Solenoid valve short/open circuit (DCC – Damper clutch control.
2. Inspect the solenoid valve power supply wiring(ATM: Automatic transmission).
   = The solenoid valve connector pin has not been fitted completely.
3. # 10 terminal does not supply power voltage to the solenoid valve.

4) Repair Guides

1. Repair the solenoid valve connector.

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How to Check if Engine Jerking when Accelerating

How to Check if Engine Jerking when Accelerating = This is the one of simplest trouble but some technician didn’t know it.
Model: Hyundai Elantra(XD)
Year Model: 2004
Fuel: Gasoline
Displacement: 2000cc
Subject: Engine Jerking when Accelerating.
1) Condition

1. Engine jerking during driving sometimes.
2. More severe problem when quick accelerating the pedal.

2) Cause

1. Spark fire leaks from spark plug cable(engine side)
2. Cable crack and white color of the cable.

3) Diagnosis

1. Scan tool check
   =Diagnosis trouble code.
   a) P0300 – Random misfire detected.
   b) P0301 – Cylinder #1 misfire detected.
2. Change the material of the spark cable.
3. Extend the length of the cable guide

4) Repair Guides

1. Replace the spark plug cables.

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How to fix the inaccurate water temperature gauge

How to fix the inaccurate water temperature gauge.
Model: Hyundai Santa Fe
Year Model: 2002
Fuel: Diesel
Displacement: 2000cc
1) Condition

1. Coolant temperature gauge indicates different level whenever the ignition key is turned ‘ON’ and ‘OFF’
   =The gauge indicates lower level than normal.

2) Cause

1. Malfunction of engine coolant temperature sensor.\

3) Diagnosis

1. Check the coolant temperature sensor ground condition and the circuit
   =Trouble not found.
2. Check the coolant temperature sensor output voltage.
   =Turn the key ‘ON’ and ‘OFF’ repeatedly.
   signal voltage shows 1.2 volts(if normal,2.5 voltage).
3. After replacing the coolant temperature sensor, the gauge operates normally.

4) Repair Guides

• Replace the coolant temperature sensor.

Please leave a comments or Email me if you need help

How to check the automatic transmission shock shifting

This is the first case we have on Genesis (BH) 4.6 litters shock shifting. since this kind of model for example if the gear box has a problem the only thing we do is to diagnose where does the problem and there are only three option to replace to Mechatronics E module + valve body,check the engine system and to replace the automatic gear box assembly.

How to check automatic transmission shock shifting

Model: Genesis (BH)

Year Model: 2009

Fuel: Gasoline

Displacement: 4600cc

Subject: Shock shifting  then car cannot be move forward,you have to off the  engine then restart and shift to drive to move.

1) Condition

1. Automatic transmission shock shifting during driving.
2. Automatic transmission not shifting.

2) Cause

• Mechatronic e module + valve body.
• Transmission assembly.

3) Diagnosis

1. Scan tool check
   = P0729 Gear 6 incorrect ratio.
   TCM sets this code if the value of input speed (Turbine speed) is not equal to the value of output speed,when multiplied by the 1st gear ratio, while the transaxle is engaged in 1st gear. if this code is outputted,check the engine system first
   Possible Cause
   1) Engine System
   2) Mechatronic E module + valve body
   3) Transmission assembly.
2. since we have no part available for this transmission.and it is not advice sable overhaul replace transmission with assembly.

3) Replace Guides

• Replace transmission with assembly.

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How to check why my car head light weak.

There are some causes why your car head light weak unless you accelerate the accelerator to rise up the RPM. Due to weak battery, poor contact of battery post to cable, defective alternator.

How to check why my car head light weak?

Model: Hyundai Sonata NF

Year Model: 2009

Fuel: Gasoline

Displacement: 2400cc

Subject: Weak a/c blower and weak lights unless accelerate to make bright.

1) Condition

1. A/C blower
2. Weak lights

2) Cause

1. Due to weak alternator charging.

3) Diagnosis

1. Scan tool check = No trouble code.
2. Check for current data = battery voltage is only 12 volt.
3. Check battery with battery tester = Good battery.
4. Check for wire connection,poor contact or corroded.= Ok
5. Check alternator pull out and put new one.
6. Check again with scan tool = Ok 13.7 Volt

4) Repair Guides

• Replace alternator assembly.

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How to check ECTS (Engine coolant temperature sensor).

Hyundai coolant temperature sensor is also one of the most important in you car today, it control fuel and serve as switch for cooling system.

How to check ECTS( Engine coolant temperature sensor)

The engine coolant water temperature sensor is located in the engine coolant passage of the cylinder head. it detects the water temperature and relay signal to the ECU. it employs a thermistor, which i sensitive to changes in temperature. The electric resistance of a thermistor decreases in response to temperature  rise. The ECU judges engine coolant temperature by the sensor output voltage and provides optimum fuel enrichment when the engine is cold.

 Troubleshooting Hints

When idling speed is not appropriate or blacksmoke arises it is likely to be a defect of water temperature sensor.

Wiring harness inspection     

Refer to P0117, P0118

USING SCAN

Check item                   Data display            Check conditions            coolant temp.    set valve

water temperature       sensor temp.         ignition switch:on or        -20*c               -20*c
sensor                                                 engine running                   0*c                0*c
                                                                                              20*c                20*c
                                                                                              40*c                4o*c
                                                                                               80*c               80*c

Using multitester

1. Removed the water temperature from the engine coolant passage of the cylinder head.
2. With temperature sensing portion of the engine coolant temperature sensor immersed in the hot water check resistance.
   
   1) WTS Sensor.
   
   Temperature (*C)                                            Resistance (Kilo Ohms) 
          -40                                                        48.14
          -20                                                        14.13~16.83
            0                                                         5.790
           20                                                        2.31~2.59
           40                                                        1.148
           60                                                        0.5865
           80                                                        0.3222
          100                                                       0.1884
          110                                                 0.1451~0.1491
          120                                                      0.1163
   
   2) Gauge Unit
   
   Temperature (*C)                                          Resistance(ohms)
              60                                                       125
            85                                                   42.6~54.2
           110                                                  22.1~26.2
           125                                                      15.2
3. If the resistance deviates from the standard value greatly, replace the sensor.

Installation:

1. Apply sealant loctite 962T or equivalent to threaded portion.
2. Install water temperature sensor and tighten it to specified torque.
   Tightening torque : 3.0~4.0 kg.m
3. Connect the harness.

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How to check if automatic transmission shock shifting.

This day i have trouble shooting regarding on Hyundai accent 2010 automatic transmission shock shifting.

Model: Hyundai Accent

Year Model: 2010

Fuel : Gasoline

Displacement: 1400cc

Subject: How to check if automatic transmission shock shifting in 1st gear.

1) Condition.

1. Automatic gear box delayed shifting.
2. Shock shifting on 1st to 2nd gear.

2) Cause.

1. Due to low level of Automatic oil.
2. Automatic transmission oil pan bolt loosed.

3) Diagnosis.

1. Scan tool check.
   = No trouble found by GDS (Global Diagnostic System)
2. Perform road test to confirm the problem = confirmed delayed and shock shifting.
3. Check for current data
   = solenoid valve one is delayed to switch on.
4. Check for automatic oil = the level is lower than empty.
5. Lift up the car by to check oil leaking = oil leaking from the oil pan bolt.
6. Repair loosed bolt and clean then add oil.
7. 2nd time to road test = The problem was gone. 

4) Repair Guides

• Retightened bolt, Add oil and clean oil leak underneath.

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How Air Flow Sensor Works?

Learn how to does air flow sensor works in your car, Its really really help full to every one who have car even you have no idea about technical but reading and reading a booklet about it someday you can tell ah.ah.ah.ah.ah.ah.ah.ah.ah.ah its easy. all car especially electronic today built in a airflow sensor.

How air flow sensor works and how to check it?

Air flow sensor (AFS)

MAF uses the features of sensor heater, after HOT FILM units calculate the intake air quantity, then send the signal to ECU. ECU decides the fuel quantity and ignition timing, and recognizes up hills and helps fuel quantity and over run air conditioner compensation , idle speed actuator MAF might be combined to measure the intake air temperature.

HOT FILM AFS OUTPUT FEATURES

Mass air flow (kg/h)                                                   Output voltage(V)
            10                                                                        1.2226~1.2398
            15                                                                        1.3552~1.3778
            30                                                                        1.6783~1.7146
            60                                                                        2.1619~2.2057
          120                                                                        2.7215~2.7762
          250                                                                        3.4388~3.5037
          370                                                                        3.8796~3.9511
          480                                                                        4.1945~4.2683
          640                                                                        4.5667~4.6469

TROUBLE SHOOTING HINT

1. When ignition switch is turned on, if AFS output voltage is not 0(Engine stops), inspect the malfunction of AFS and ECU.
2. Even though AFS output voltage is abnormal, if engine is at idle, inspect the following condition. 
   1) Heck the poor attachment of airflow, cut the air duct, and air cleaner filter branched from AFS.
   2) Bad combustion in the cylinder or fault injector.
3. Even if no AFS malfunction occurs , check the mounting direction of AFS.
   Note:
   = Use correct voltmeter.
   = Before inspection, warming up the engine till the engine coolant temperature is up to 80 ~90*c

trouble study

What is the cause of engine rough idling and how to check it.

The is one of engine problem occurs on your car.

What is the cause of engine rough idling and how to check it?

Model : Hyundai Santa Fe (SM)

Year Model : 2002

Fuel : Gasoline

Displacement: 2000cc

Subject : Engine rough idling – Injector.

1) Condition

1. Engine RPM becomes rough and vibration occurs at idle speed.
2. Poor engine acceleration during driving.

2) Cause

1. Malfunction of injector ( Cylinder # 3).

3) Diagnosis

1. Scan tool check
   = No diagnosis trouble code.
2. Check the high and low pressure line – Normal condition.
3. Check the amount of returned injection fuel.
   = Lots of returned fuel in the line # 3 injector.
   = The returned amount of fuel in the # 3 injector is much more than other cylinder.
   = Normal amount of returned fuel for 3 minutes in warm engine is approximately 18~20 cc.

4) Repair Guides

1. Replace the # 3 injector assembly.

more study

How to check fuel smell occurs inside the car.

How to check fuel smell occurs inside the car at the same time engine hesitation and rough idling in hot condition.

Model : Hyundai Azera (TG)

Year Model: 2008

Fuel : Gasoline

Displacement: 3300cc

Subject: Fuel smell occurs inside the car and engine hesitation and rough idling in hot condition.

1) Condition

1. Fuel smell occurs inside the car during hot condition.
2. Engine hesitation occurs when acceleration in hot condition.

 2) Cause

1. Due to purge control solenoid valve malfunctioning.

3) Diagnosis

1. Scan tool check = fail safe throttle body & oxygen sensor.
2. Check current data for purge control solenoid valve= Not working
3. Manually check if the purge valve is working or not.
   = hold the purge and accelerate, you can feel if its working.

4) Repair Guides

• Replace purge control valve
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How to Check if Engine Hesitate when Acceleration?

Field Case Study of Hyundai Trajet due to spark plug wire the engine will hesitate when accelerate.

How to check if engine hesitate when acceleration?

Model: Hyundai Trajet V6

Year Model : 2004

Fuel : Gasoline

Displacement: 2700cc

Subject: engine hesitation – Spark plug wire.

1) Condition

1. Engine hesitation when starting in cold condition.
2. Poor engine power in warm condition.

2) Cause

• Number 1 spark plug wire is cracked.

3) Diagnosis

1. Scan tool check (DTC)
   = No trouble code
2. Inspect the engine condition with spark plug cable removed one by one.
   ( in  engine starting condion)
3. Inspect wave form using scan tool.
   = Abnormal wave form in # 2 cylinder.
4. Check the spark plug wires.
   = Abnormal condition (Number 1 wire is cracked).
   = After replacing the spark plug wire, the engine operates normally.

4) Repair Guides

• Replace the spark plug wire with new one.

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How to Fixed Engine Hard Starting?

These is the case I encountered today.the problem occurs due to pressure control valve clogging, with foreign materials.

How to Fixed Engine Hard Starting?

Model: Hyundai Santa Fe (SM)

Year Model: 2004

Displacement: 2000CC

Fuel: Diesel 

T/A: Auto

Subject: Engine Hard Starting – Pressure Control Valve.

1) Condition

1. Hard starting of CRDI diesel engine.

2) Cause.

1. Foreign material in the fuel pressure control valve.

3) Diagnosis

1. Scan tool check.
   = Diagnostic Trouble Code (No Trouble Code)
   = Inspect current data: Rail pressure is abnormal.
2. Inspect high pressure pump.
   = Separate the high pressure pipe that connects with common rail.
   = Detach the rail pressure from common rail.
   = Connect the separated high pressure pipe to rail pressure sensor.
   = Crank engine and check the fuel pressure: 1480 bar (Normal)
   
   Standard Value: 1500 bar
   
3. Inspect the injector.
   = Detach the high pressure pipe that is connected from common rail to injector.
   = Inspect the vacuum leakage (#1~#4) using hand vacuum pump: Normal.
4. Inspect the rail pressure control valve.
   = Remove the rail pressure control valve from common rail
   = Inspect the vacuum leakage using hand vacuum pump.
   = Foreign material is found inside the common rail.

4) Repair Guides

1. Replace the fuel pressure control valve.

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How to Check if Sometimes Engine Hard Starting?

This case probably intermittent engine hard starting.

How to Check if Sometimes Engine Hard Starting?

Model: Hyundai Santa Fe (SM)

Year Model: 2004

Fuel: Diesel

Displacement: 2000cc

T/A : Auto

Subject: Intermittent Hard Starting = Fuel Filter

1) Condition:

1. Intermittent hard starting and hesitation occur when initial engine starting
2. Starting is possible after cranking for 2~3 times.
3. After starting, severe engine hesitation happens..

2) Cause:

1. Faulty check valve in the fuel filter.

3) Diagnosis

1. Scan tool check
   = No trouble found
2. Current data shows abnormal fuel pressure during starting.
3. Check the high pressure line – lower than normal pressure.
   
   Specification : Max 1,350~1,500 bar
   
4. Check the low pressure line – Normal
   = Tips for pressure test : Connect the rail pressure sensor with fuel line from high pressure pump.
5. Check the high pressure pump = Normal.
6. Check the pressure regulator in the fuel filter
   = The valve is stuck.
   = After replacing the fuel filter ( pressure regulator ), the engine operating normally.
7. The arrow high sign
   = Green: fuel return line
   =  Red : High pressure pump line.
   = Blue : Low pressure pump line.

4) Repair Guides

1. Replace the fuel filter assembly including check valve.

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How To Check The Hyundai Elantra Not Cranking?

This trouble hard to think but if you found out the problem it is easy.

 How To Check The Hyundai Elantra Not Cranking.

Model: Hyundai Elantra (HD)

Year Model: 2011

Fuel : Gasoline

Displacement: 1600cc

Subject: Engine not Cranking and immobilizer indicator Off – EM 11 Connector disconnected.

1) Condition

1. Engine not cranking.
2. Immobilizer indicator Off.

2) Cause

1. Due to disconnected wiring at EM11 connector located at front passenger under the glove box

3) Diagnosis

1. Check by Scan tool.
   = Trouble found.
2. Check voltage = Ok
3. Starter relay not working or clicking when turn the ignition key to start position.
4. Check all fuses = OK
5. Visually check.
   = Since the car is brand new only 3026 km i don’t think that there are shorted wire.but the plastic carpet that put from other workshop got my attention to think of it
6. Check for I/P fuse box connector = OK no problem.
7. Check the connector from under glove box one wire connector loosed not properly connected. EM11

4) Repair Guides

1. Reconnect EM 11 connector  and try to start = immediately start the engine.

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How to Diagnose The Genesis Poor Acceleration?

Hyundai Genesis (BH) During driving press the accelerator but no response

Model : Hyundai Genesis (BH)

Year Model: 2009

Fuel: Gasoline

T/A: Auto

Subject: Engine poor acceleration at idle and during driving.

1) Condition

1. Engine poor acceleration at idle and during driving .

2) Cause

1. Due to clogged intake air cleaner.

3) Diagnosis

1. Scan tool check = No trouble code found.
2. Visually check the engine if something sensor or other parts replace from other workshop. NO sign Engine cover full of sand soil.
3. Check for the intake air cleaner full of sand soil.
Pull out and return the air duck then run the engine the problem disappeared.

4) Repair Guides

1. Replace Air Cleaner.

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How To Diagnose The Intermittent RPM Rising?

This trouble case occurs intermittently during driving, As a technician you have to give attention by road testing to probe the problem at the same time you got an idea where you begin to trouble shoot the problem.
Model: Hyundai Santa Fe (SM)
Year Model: 2002
Fuel: Gasoline
T/A : Auto
Displacement: 2000cc
N Code : Rough Idling
C Code: Poor Contact & Short Open Circuit
Subject: Intermittent RPM Rising – APS (Acceleration Position Sensor)
1) Condition:

1. Intermittently the engine RPM increases ( 750>1,300RPM) While Braking.

2) Cause:

1. APS (Acceleration Position Sensor) malfunction.

3) Diagnosis:

1. The APS signal is 899 mV at idle.
   
   Specification 0.6~0.75 Volt.
   
2. Check the Power  which is inputted to APS sensor, ground line,signal power – normal.
   Specification
   - Sensor power: 4.5~5.5 volt(Disconnect the connector)
   - Sensor ground: 0 volt
   - Sensor signal: idling 0.6~.75 volt, Full throttle 3.6~4.6 volt
   
3. Inspect the terminal of APS connector – Normal.
   
4. Supply power source (0.6v) to APS signal line using simulation mode in GDS
   = Normal operation of engine.
   = Replace the APS.
   = After replacing the APS, the sensor data and all system operate normally.

4) Repair Guide

• Replace the Acceleration Position Sensor.

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How To Diagnose Engine Poor Acceleration.

HYUNDAI AZERA,This case probably occurs to the car due to human error.Car car was engine overhaul last to months. Due to engine overheating Radiator fan not working we found out that has an accident at the front and the fan module damage. it is not covered by warranty, we make total estimate for all the damage, after finish the owner take his car. then after two months again come and the problem is poor acceleration.
Model: Hyundai Azera
Year Model: 2009
Mileage: 40715km
Fuel: Gasoline
Displacement: 2700cc
T/A : Auto
Subject: Engine suddenly  poor acceleration – Engine compartment Junction box.
1) Condition:

1. Suddenly engine poor acceleration.
2. Engine excessive vibration.

2) Cause:

1. internal engine compartment fuse box.

3) Diagnosis:

1. Scan tool check
   = Fail safe ( limp home of throttle body, oxygen sensor, Oil control valve, Camshaft position sensor.)
2. Visually Check up
   = lift up the car by lifter to check if there is a damage. Front damage due to accident. and fix from outside workshop but some front harness wire dislocation from the original position.
3. Check the engine compartment fuse box if damage only  scratch.
4. pull out and check the wire connector – Ok
5. Re-fixed again the engine fuse box then connect the GDS(Global Diagnostic System) the trouble code is different from the first trouble code.
6. So replace the engine fuse box with good fuse box then start.
7. The problem disappeared.

4) Repair Guide

1. Replace engine compartment fuse box.

more azera study? | more info?
Hyundai Cars Elantra

How to Diagnose a Hyundai Elantra not Starting?

Model: Hyundai Elantra

Year Model: 2009

Mileage: 37012km

Fuel : Gasoline

Displacement : 1600cc

T/A : All

1) Condition:

1. Engine Not Cranking
2. GDS(Global Diagnostic System) Cannot communicate to ECU(Engine Control Unit.
3. Engine Cranking But Not Starting

2) Cause:

1. Due to weak Battery
2. Due to inside passenger fuse box.
3. ECU

3) Diagnosis

1. Recharge Battery
2. Check Data link connector power and Ground at same time check for CAN communication = Failed.
3. Visual inspection = ECU sealed broken due to other workshop attemp to open and repair.
4. Replace ECU But still not communicating.
5. Replace inside passenger fuse box.
6. Reprogram immobilizer key = Communication now OK .

4) Repair Guides

1. Recharge Battery.
2. Replace Inside passenger fuse box.
3. Replace ECU.

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How to Fix a Engine RPM Up and Down?

Model: Hyundai Grandeur

Year Model: 2001

Displacement: 3000cc

Fuel : Gasoline

T/A : Auto

Subject: RPM Up and Down on Stop Light When the Engine is in Hot Condition.

1) Condition

1. RPM Up and Down on Stop Light When The Engine is in Hot Condition.
2. Cut on Engine Idling.

2) Cause

1. Due to the EGR hose leaking.
2. Failure sensor malfunctioning.

3) Diagnosis

1. Check Scan tool
   =Trouble Code (P1191 & P1193 = Related on Throttle Body)
   In relation to the trouble code.
   1) Ignition system.
   2) Fuel System.
   3) Air leaking.
   4) Poor contact of socket pin and terminals.
2. Check by road testing to confirm the problem = Confirmed
3. Check the Spark plug and High tension wire = OK
4. Check for fuel pressure with Gauge = OK
5. Check and repair vacuum hose from EGR = OK
6. Clean all wiring terminal from engine = Ok
   = Test again but the problem still occurs.
7. Check for current data
   = Engine RPM very low reading.
   = Air and Fuel mixture out of Specification.
8. Check for wiring diagram of MFI.
   = failure sensor is connected to the tachometer.
   Check the terminal wiring = current OK
9. Check with good failure sensor and Adjust the RPM to the TPS and Acceleration position sensor. then road test = the problem disappear.

4) Repair Guides

Replace Failure sensor.

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How to Fix an Engine Not Starting?

Model: Hyundai Santa Fe (SM)

Year Model: 2002

Mileage: 137500km

Displacement: 2000cc

Fuel: Diesel

T/A : Auto

Subject: Impossible to Start The Engine – Diesel Fuel

1) Condition:

1. Impossible to start the engine.
2. Cranking ids possible.

2) Cause:

1. Fuel line is clogged with contaminated diesel fuel.

3)  Trouble Diagnosis:

1. Scan tool check.
   = Current data: fuel pressure is lower than 44 bar during cranking.
   Specification : Higher than 150 bar.
2. Check the low pressure fuel line – The fuel pump does not operate.
3. After replacing the fuel pump, Start the engine is possible but hesitation still occurs.
4. Check the service data.
   = No trouble found.
   = The amount of fuel injection is 24 cc in the idle condition.
5. Check the amount of returned fuel to find poor injectors.
6. The color of diesel fuel is different from normal fuel.

4) Repair Guides:

1. Replace all the related parts.
   (Diesel fuel, low pressure pump ,fuel tank, fuel sender, fuel filter.
2. Clean the fuel system.
   = Diagnosis tips : Engine hesitation and/ or stalling problems on  CRDI diesel engine
   = If DTC code regarding sensor or fuel pressure is displayed, check the related to control engine idle.
3. Check method of fuel injectors
   = Check the amount of returned fuel from injectors and compare it each other.
   = Check the injection power balance.
   = Disconnect the injector connector one after another in idle condition.

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New Model H1 (TQ) Stalling And Cut Off

Model: Hyundai H1(TQ)

Year Model: 2009

Mileage: 39325km

Displacement: 2400cc

Fuel: Gasoline

T/A: All

Subject: Engine stalling at the same time cut off during driving – Spark plug & Fuel pump.

1) Condition:

1. Sudden acceleration engine stall and cut off during driving especially on hot condition.

2) Cause:

• Abnormal spark plug gap.
• Malfunctioning fuel pump and it occurs during driving at engine hot condition.

3) Diagnosis

1. Scan tool check = no trouble found.
2. Replace with good condition spark plug.
3. Check for fuel pump pressure with gauge = out of specification after an hour.

4) Repair Guides

• Replace spark plug.
• Replace Fuel pump motor.

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Does Engine Stalling When You Accelerate?

Model: Hyundai Santa Fe
Tear Model: 2002
Mileage: 126345km
Displacement: 2000cc
Fuel : Diesel
T/A : All
Subject: Engine Stalling When Accelerating in Cold Condition – Fuel Tube
1) Condition

1. Engine Stalling in Cold Condition When Accelerating Suddenly.
   = Normal In Idling Condition.
   = Engine stalls more frequently in cold condition than in heat condition.
2. Engine stalls intermittently when driving in heating condition.
   = Normal in idling condition, but the engine stalls when driving on hilly road or decelerating suddenly.

2) Cause

1. Due to the fluctuation of low pressure tube, the fuel is not supplied enough so the engine stalls when accelerating.

3) Diagnosis

1. Scan tool check.
   = Diagnostic trouble code( P1181 = Fuel pressure monitoring fail.
   = Current data = Normal in cold and idling condition.(WGT).
   = The fuel pressure control valve increases abnormally when accelerating the engine suddenly.
2. Inspect the rail pressure(from low pressure to high pressure).
   = Check the pressure after stalling the fuel pressure gauge to low pressure line( The line between the low pressure pump and fuel filter)
   = The pressure is measured by 2.8 in idling condition.
   ( STANDARD VALUE 2.5~2.8 bar)
   = The pressure after installing the fuel pressure gauge between the filter and high pressure pump.
   = Normal pressure in idling condition.
   = The fuel pressure decreases rapidly when decelerating after the fuel pressure gauge is installed.
3. Inspect the fuel filter.
   = Drain the water from the fuel filter.
   = Check if there are remains in fuel filter after discharging the fuel.
4. Check the line from fuel filter to high pressure pump.
   = The tube near by fuel filter has been damaged.

4) Repair Guides

1. P1181 (C010) is related to fuel pressure. This is a basis of diagnosis.
2. Damage of tube may be occurred when producing the tube.
   The engine stalls in cold condition frequently because the fuel tube is contracted  in cold condition more than in heating condition. Therefore the fuel is not supplied enough to high pressure pump. Compared with this, in heating condition, the amount of contraction is small so the problem is not occurred.
3. If the fuel pressure malfunction is suspected, inspect the fuel pressure data and fuel pressure regulator  data in G- Scan with below condition.
4. P1181 (C010) fuel pressure monitoring fail ( fuel pressure high idle ) code
   = this code is displayed when abnormal fuel pressure is detected.

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Clicking Noise From Sunroof Sonata YF?

Model: Hyundai Sonata YF
Year Model: 2011
Displacement: 2400cc
Mileage: 10247km
Fuel: Gasoline
Subject: Clicking Noise From Sunroof.
1) Condition:

1. Unusual clicking noise from sunroof while driving.

2) Cause:

• Due to Sunroof linkage.

3) Diagnosis:

1. Road test to probe if the problem occurs = Noise occurs.
   
2. Pull out the Sunroof and check some linkage loosened.

4) Repair Guide:

• Repair and Retightened all parts

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Is Your Hyundai Santa Fe Has Engine Problem?

Let me Give you Some Field Case Study So That If Ever This Problem Occurs On Your Hyundai Santa Fe Car You Have Knowledge About It.

Model: Hyundai Santa Fe

Displacement: 2000cc

Year Model: 2002

Mileage: 123895km

Fuel: Diesel

T/A : Auto

Subject: Engine Rough Idling – Injector

1) Condition:

1. Engine RPM becomes rough and vibration occurs at idle speed.
2. Poor engine acceleration during driving.

2) Cause:

1. Malfunction of injector (Cylinder # 3).

3) Diagnosis:

1. Scan Tool Check
   = No trouble code
2. Check the low and high pressure line – Normal Condition.
3. Check the amount of returned injection fuel.
   = Lots of returned fuel in the # 3 injector.
   = The returned amount of fuel in the # 3 injector much more than other cylinder.
   = Normal amount of returned fuel for 3 minutes in warm engine is approximately 18~20cc.

4) Repair Guide:

1. Replace the injector # 3 assembly.

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Can Accelerator Cable Create Abnormal Noise?

Model: Hyundai Grandeur (XG)
Year Model: 2000
Mileage: 130276km
Displacement: 2500cc
Fuel: Gasoline
T/A: Auto
1) Condition:

• Noise is Heard from the instrument panel and heater duct when the RPM is 1,500~1,800.

2) Cause:

1. The trap of power steering high- pressure hose and accelerator cable are tightened too hard.

3) Diagnosis:

1. Check the instrument panel and the heater area – Trouble not found.
   
2. Check the engine room area.
   = The strap of the power steering high-pressure hose and the accelerator cable are tightened too hard
   = The noise travels through the accelerator cable into instrument panel.
   = After loosening the strap, the symptom has disappeared.

4) Repair Guide:

• Loosen the Strap of the accelerator cable and the high pressure hose.

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Unusual Engine Noise

Knocking noise usually from internal parts of engine.but this knocking sound is different from normal noise.

Model: Grandeur (XG)

Displacement: 3000cc

Year Model: 2003

Mileage: 128354km

Fuel: Gasoline

T/A : Auto

1) Condition:

1. Engine noise in cold condition or accelerating.

2) Cause:

• Damage Damper pulley.

3) Diagnosis:

1. The tension of Drive belt is normal.
2. The symptom disappears after dismounting the drive belt.
3. Damper pulley  vibrates after re-installing the drive belt.= Pulley is Cracked.

4) Repair Guide:

• Replace the Damper pulley

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Poor Engine Acceleration and Hesitation

Model: Hyundai Grandeur (XG)

Displacement: 3000cc

Model Year: 2004

mileage: 120430 km

Fuel: Gasoline

T/A : All

1) Condition:

1. Poor engine acceleration and hesitation.

2) Cause:

1. Surge tank is misassembled after the spark plug are replaced which cause air leaking.

3) Diagnosis:

1. Scan tool check
   = Diagnosis Trouble Code(P0100 – Airflow sensor malfunction.
2. Current data shows the injection time from injector which is longer than spec. at idling(4ms).
3. AFS output signal is 1567 mV at ignition on. This data is higher than specification.
4. After changing the AFS, poor acceleration is disappeared, but there are still unstable engine and air leaking noise at idling.
5. Cleaning spray(WD 40) is sprayed toward surge tank for leaking test, Engine RPM is charged when spraying , which indicates air leakage.

4) Repair Guide

• Reinstall the surge tank and replace the AFS.

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Passenger fuse box affects Hazard and Signal Light?

Field Case Study

Model:Hyundai Elantra (HD)

Year Model: 2009

Mileage: 79251km

Displacement: 1600cc

T/A: All

Fuel: Gasoline

1) Condition:

1. Intermittent Turn and Signal light not Working.

2) Cause:

1. Due to the hazard and signal light fuse busted
2. Overheating Car Stereo.

3) Diagnosis:

1. Scan toll check = No trouble code found.
2. Check the fuse and relay from engine compartment fuse box = Hazard fuse busted (Replace fuse)
3. Check the fuse and relay from the passenger fuse box = signal or turn light fuse busted(Replace fuse)
   
   = Test the car with all lights on to see if the problem still occurs.After an hour = Ok All are working
   = Then  all lights switch off except signal light, then the Car stereo switch On After a minute suddenly the signal light block out.
4. Check for the Electrical Trouble Manual of Hazard and Signal light and Car Stereo = there is no wire connected to the Car stereo, but their only joint together on the electronically passenger fuse box.
5. Check for the diagram of Car stereo and check the wire connection = the power memory wire is seems like burnt from the passenger fuse box to the stereo terminal.
6. visually check the fuse box, power memory terminal corroded.
7. Check for wire shorted = OK all wire good.
8. Found out that the Car stereo overheating.

4) Repair Guide

1. Replace passenger fuse box and Car Stereo.

More Field Study

Auto Transaxle Diode Corrosion

Model:Hyundai H100 Truck (HR)

Year model: 2004

Mileage: 130956 km

Displacement: 2000cc

Fuel: Gasoline

T/A: All

Subject: Automatic Transmission Diode Corrosion in the Wiring Control

1) Condition;

1. Harsh Shift and Trans axle Hold in 3rd gear fail safe.

2) Cause:

1. Corrosion of the ATM diode pins in the control wiring.

3) Diagnosis:

1. Scan tool Check
   = Diagnostic Trouble Code
   1) P0707 – Transaxle range switch – open circuit.
   2) P0708 – Transaxle range switch – short circuit.
   3) P1529 – TCM error – Invalid message
   4) P1586 – Encoding signal circuit not rational.
2. Remove the control wiring grommet.
3. Locate the ATM diode that is wrapped up yellow tape loose yellow tape from the control wiring.
4. Disconnect the ATM diode using long nose pliers.
5. Clean the diode connector (Female side) using solvent.
6. Apply contact grease in each opening of the diode connector terminal (Contact grease (P/No. : 08970 – 00010)).
7. Insert the new ATM diode into the diode connector.
8. Reinstall the wiring and water proof tape around the control wiring within the range as shown.

4) Repair Guide:

1. Replace the Auto TM diode.
   = Do not replace auto TM or control wiring harness.

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