How to repair auto trans. shock shifting

How to repair auto trans. shock shifting.

Model: Hyundai Accent (MC)

Year Model: 2010

Fuel: Gasoline

Displacement: 1400cc

Subject: Automatic transmission shock shifting

 

1) Condition

1. Shock is occurs “P” to “R” from “N” to “D”

2) Cause

1. Due to valve body harness disconnected.
2. Due to TPS #2 wire disconnected.

3) Diagnosis

1. Scan tool check
   = Trouble code is set inrelation to valve body solenoid.
   = P0122 –Throttle/Pedal Position Sensor/Switch A Circuit Low Input.
2. Check Scan tool monitoring from GDS
   =TPS is abnormal Reading.
3. Visually check for the TPS Disconnect the socket.
   =Pin # 2 disconnected.
4. Visually check for the harness from valve body
   =The socket was also disconnected.

4) Repair Parts.

1. Repair for the harness disconnected from TPS socket and Harness valve body.

2010  G 1.4 DOHC  Engine  Unleaded EOBD = P0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Input

Component Location

General Description

The Throttle Position Sensor (TPS) is mounted on the throttle body and detects the opening angle of the throttle plate.

The TPS has a variable resistor (potentiometer) whose characteristic is the resistance changing according to the throttle angle. During acceleration, the TPS resistance between the reference 5V and the signal terminal decreases and output voltage increases; during deceleration, the TPS resistance increases and TPS output voltage decreases.

The ECM supplies a reference 5V to the TPS and the output voltage increases directly with the opening of the throttle valve. The TPS output voltage will vary from 0.2~0.8V at closed throttle to 4.3~4.8V at wide-open throttle.

The ECM determines operating conditions such as idle (closed throttle), part load, acceleration/deceleration, and wide-open throttle from the TPS. Also The ECM uses the Mass Air Flow Sensor (MAFS) or Manifold Absolute Pressure Sensor (MAPS) signal along with the TPS signal to adjust fuel injection duration and ignition timing.

DTC Description

If the sensor input voltage is lower than the minimum threshold value during 0.08 sec under normal driving condition, PCM sets DTC P0122.

DTC Detecting Condition

Item
Detecting Condition
Possible Cause

DTC Strategy
● Signal check, low
● Poor connection
● Open or short to ground in power circuit
● Short to ground in signal circuit
● TPS
● ECM

Enable Conditions
● Engine speed  600 rpm

Threshold Value
● Calculated signal from sensor voltage  3.1%

Diagnostic Time
● 0.08 sec

MIL ON Condition
● 2 driving cycle

Specification

ITEM
Specification

TPS Resistance (kΩ)
2kΩ ± 20% (20°C)

Schematic Diagram

Signal Waveform

2010 > G 1.4 DOHC > Engine > Unleaded EOBD > P0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Input

Terminal and Connector Inspection

1.

Many malfunctions in the electrical system are caused by poor harness and terminals.

Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

3.

Has a problem been found?

YES

1)

Repair as necessary and go to "Verification of Vehicle Repair" procedure.

NO

1)

Go to "Power circuit inspection" procedure.

Power Supply Circuit Inspection

1.

Key "OFF".

2.

Disconnect TPS connector.

3.

Key "ON".

4.

Measure the voltage between terminal 2 of TPS harness connector and chassis ground.

A.

Specification : Approx. 5V

5.

Is the measured voltage within specifications ?

YES

1)

Go to "Signal circuit inspection" procedure

NO

1)

Check for Open or Short to ground in TPS circuit. Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Signal Circuit Inspection

1.

Key "OFF".

2.

Disconnect TPS connector.

3.

Key "ON".

4.

Measure the voltage between terminal 1 of TPS harness connector and chassis ground.

A.

Specification : Approx. 5V

5.

Is the measured voltage within specification ?

YES

1)

Go to "Component inspection" procedure.

NO

1)

Repair Short to ground in signal circuit and go to "Verification of Vehicle Repair" procedure.

 

MORE CASE & LEAVE AS COMMENTS

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.

more study

How to Test the Electronic Voltage Regulator.

This the continuation of Regulated Voltage Test Study 4.
TEST:

1. Turn On the Ignition switch and check to see the voltage indicates the following value.
   
   Voltage: Battery Voltage.
   
   If reads 0V, there is an open circuit in the wire between the alternator “B” terminal and the battery and the battery (-) terminal.
2. Start the engine. keeps all light and accessories off.
3. Run the engine at the speed of about 2,500 rpm and read the voltmeter when the alternator output current drops to 10A or less.

RESULT:

1. If the voltmeter reading agrees with the value listed  in the regulating voltage table below, the voltage regulator is functioning correctly. If the reading is other than the standard value, the voltage regulator or alternator is faulty.
   
   REGULATING VOLTAGE TABLE:
   Voltage regulator ambient                              Regulating Voltage
       temperature *c(*F)                                                         
       -30 (-22)                                                 14.2~ 15.3
        25(77)                                                   14.2 ~ 14.8
        135(275)                                                13.3 ~ 14.8
   
2. Upon completion of the test, reduce the engine speed to idle, and turn off the ignition switch.
3. Disconnect the battery ground cable.
4. Remove the voltmeter and ammeter and the engine tachometer.
5. Connect the alternator output wire to the alternator “B” terminal.
6. Connect the battery ground cable.
   READ MORE PAGE #3

Study 4 of Engine Charging System

= Now we Study the Regulated Voltage test=
= The purpose of this test is to check that the electronic voltage regulator control voltage correctly.
Preparation:

1. Prior to test, check the following items and correct as necessary.
   Check that battery installed on the vehicle is fully charged. The battery checking method is described in the section inspect “Battery”.
   Check the alternator drive belt tension. the belt tension check method is described in the section “Inspect drive belt”
2. Turn ignition switch to off.
3. Disconnect the battery ground cable.
4. Connect the digital voltmeter between the “B” terminal of the alternator and ground. Connect the (+) lead of the voltmeter to the “B” terminal of the alternator. Connect the (-) lead to the good ground or the battery (-) terminal.
5. Disconnect the alternator output wire from the alternator “B” terminal.
6. Connect the DC ammeter (0 to 15A) in series between the “B” terminal and disconnected output wire. Connect the (-) lead wire of the ammeter to the disconnected output wire.
7. Attach the engine tachometer and connect the battery ground cable.

Read more Study 3

Charging Sytem of an Auto bile Study 3

= Output Current Test=
(Click here to Study 2)
* This test determines whether or not the alternator gives an output current that is equivalent to the normal output.
PREPARATION:

1. Prior to the test, check the following items and correct as necessary. Check the battery installed in the vehicle to ensure that is good condition. the battery checking method is described in the section “Battery”. The battery that is used to test the output current should be that has been partially discharged. With a fully charge battery, the test may not be conducted correctly due to an insufficient load. Check the tension of the alternator drive belt”.
2. Turn off the ignition switch.
3. Disconnect the battery ground cable.
4. Disconnect the alternator output wire from the alternator “B” terminal.
5. Connect a DC Ammeter () to 15A) in series between the “B” terminal and disconnected output wire. Be sure to connect the (-) lead wire of the Ammeter to the disconnected output wire.
   
   NOTE:
   = Tightened its connection surely, as a heavy current will flow.
6. Connect a volt meter(0 to 20V) between the “B” terminal and ground. Connect the (+) lead wore to the alternator “B” terminal and (-) lead wire to a good ground.
7. Attach an engine tachometer and connect the battery ground cable.
8. Lead the engine hood cable.

TEST:

1. Check to see that the voltmeter reads as the same value as the battery voltage. If the voltmeter read 0V, and the open circuit in the wire between alternator “B” terminal and battery (-) terminal or poor grounding is suspected.
2. Start the engine and turn on the headlamps.
3. Set the headlamps to high beam and the heater blower to high, quickly increase the engine speed to 2,500 rpm and read the maximum output current value indicated by the ammeter.
   
   NOTE:
   After the engine start up, the charging current quickly drops.
   Therefore, the above operation must be done quickly to read the maximum current value correctly.

RESULT:

1. The ammeter reading must be higher than the limit value. If it is lower but the alternator output wire is in good condition, remove the alternator from the vehicle and test it.
   Limit value: 91A min.(130A alternator.
   
   NOTE: 1) The nominal output current value is shown on the nameplate affixed to the alternator body.
   2) The output current value changes with the electrical load and the temperature of the alternator itself.
   Therefore, the nominal output current may not be obtained. if such is the case, keeps the headlamps on the cause discharge of the battery, or use the lights of the another vehicle to increase the electrical load.
   The nominal current may not be obtained if the temperature of the alternator irself or ambient temperature is too high.
   In such a case, reduce the temperature before testing again.
2. Upon completion of the output current test, lower the engine speed to idle and turn off the ignition switch.
3. Disconnect the ground cable.
4. Remove the voltmeter and the ammeter  and tachometer.
5. Connect the alternator output wire to the alternator “B” terminal.
6. Connect the battery ground cable.

 

Charging Sytem of an Auto bile Study 2

Now Study on how to check the battery terminals and fuses.
(Click here to #1)

1. Check the battery terminals are not loosed or corroded.
2. Check the fuses for continuity.

Inspect Drive Belt:
= Visually check the belt for excessive wear, frayed cords ect.
   If any defect has been found replace the drive belt.

Note:
Cracks on the rib side of a belt are considered acceptable. If the belt has chunks missing from the ribs, It should be replace.
Visually Check Alternator Wiring and Listen for Abnormal Noise:

1. Check that the wiring is in good condition.
2. Check that there is no Abnormal noise from the alternator while the engine is running.

Check Discharge Warning Light Circuit:

1. Warm up the engine and then turn it off.
2. Turn off all accessories.
3. Turn the ignition switch “ON” check that the discharge warning light is lit.
4. Start the engine. Check that the lights lit. If the light does not go off as specified , troubleshoot the discharge light circuit.

Inspect Charging System
Voltage Drop Test of Alternator Output Wire.
= This test determines whether or not the wiring between the alternator “B” and the battery (+) terminal is good by the voltage drop method.
Preparation:

1. Turn the ignition switch to off.
2. Disconnect the out put wire from the alternator “B” terminal. Connect the (+) lead wire  of ammeter to the “B” terminal of alternator and the (-) lead wire of ammeter to the output wire. Connect the (+) lead wire of voltmeter to the “B” terminal of alternator and the (-) lead wire of voltmeter to the (+) terminal of battery.

Test:

1. Start the engine.
2. Turn on the headlamps and blower motor. and set the engine speed until the ammeter indicates 20A. And then, read the volt meter at this time.

Result:

1. The volt meter may indicates the standard value.(Standard value: 0.2V max)
2. If the value of the voltmeter is higher than expected (above 0.2V max). poor wiring is suspected. In this case check the wiring from the alternator “B” terminal to the battery (+) terminal. Check for loosed connections, color change due to an overheated harness, ect. Correct them before testing again.
3. Upon completion of the test, set the engine speed at idle. Turn off the headlamps, blower motor and the ignition switch.

Charging Sytem of an Auto bile Study 1

Description:
The charging system included a battery , an alternator with a built-in regulator , and the charging indicator light and wire.
The Alternator has built in diodes, rectifying AC current to DC current.
Therefore , DC current appears at alternator ,”B” terminal. In addition , the charging voltage of this alternator is regulated by the battery voltage detection system. The main component of the alternator are the rotor, rectifier, capacitor brushes, bearing and V-ribbed belt pulley. The brush holder contains a built in electronic voltage regulator.
On Vehicle Inspection:
CAUTION:

• Check that the battery cables are connected to the correct terminals.
• Disconnect the battery cables when the battery is given a quick charge.
• Never disconnect the battery while the engine is running.

Check the Battery Voltage

1. If 20 minutes have not passed since the engine was stopped , turn the ignition switch On and turn On the electrical system(head lamp, blower motor, rear defogger ect.) for 60 seconds to removed the surface charge.
2. Turn the ignition switch Off and turn Off the electrical system.
3. Measure the battery voltage between the negative (-) and the positive(+) terminals of the battery.

Standard Voltage: 12.5~ 12.9V at 20 degrees Celsius (68 “F) 
= If the voltage is less than specification, charge the battery.