How or what is the cause of Engine back firing

How or what is the cause of engine back firing.

Model: Elantra MD

Year model: 2012

Displacement: 1.8 cc

How or what is the cause of engine backfiring.

= This case for the Elantra new model first time for me to trouble shoot. i make road test to confirm the problem & for the engine to get the normal temperature. after a half an hour of engine running turn off the engine.immediately the problem occured means the customers problem confirm. check with the GDS ( Global Diagnostic System ) for the trouble code but there is no trouble code found then all current data also they are in good condition.

= I will try to barrow one good ECU and fixed then make another road test after half an hour turn off the engine. then the problem disappear.

=Replace new ECU.

How to Check a Trouble Code P0237?

How to Check a Trouble Code P0237?

Model: Hyundai Auto

Gasoline : Diesel

 

How to  Check a Trouble Code P0237?

P0237 Boost Press. Sensor - Circuit Low Input

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Study Guide and Component Location Study Guide and General Description Study Boost Pressure Sensor(BPS) is installed in intake manifold and senses the pressure of air inside of intake manifold which is compressed by turbo charager. Study Measuring mass air flow accurately with the information of intake mainfold pressure, mass air flow and intake air temperature, ECM performs actuating correction of EGR and VGT. Study When excessive intake manifold pressure is detected, engine power generation is limited to protect engine because too highly compressed pressure due to turbo charger may harm engine. Study Guide and DTC Description Study P0237 is set when the voltage below 0.2V - mimimum output voltage of BPS - is detected for more than 2 sec.. Study This code is due to open in power circuit or short to ground in signal circuit. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause   DTC Strategy Study • Voltage monitoring • BPS circuit • BPS component Study Enable Conditions • IG KEY "ON" Study Threshold Value • Output signal below minimum value(below 200mV) Study Diagnostic Time • 2 sec. Study Fail Safe Fuel cut NO • Boost pressure is fixed at 1000 hpa. EGR Off YES Fuel Limit YES Check Lamp OFF Specification Pressure [Kpa] 20 100 190 250 Outpur voltage [V] 0.4±0.077 1.878±0.063 3.541±0.063 4.650±0.077 Diagnostic Circuit Diagram Signal Waveform & Data Fig1). This is the waveform of BPS as accelerating from idle state. Signal voltage rises as accelerating. Study Guide , Study Guide , Study Guide , Study Guide , Study Guide , Study Guide , Study Guide

How Geometric Turbocharger Works?

How Geometric Turbocharger Works?

 

How Geometric Turbo charger Works?

Model: Hyundai Engine

2011  D 2.0 CRDI  Engine  Engine Control  P0234 Turbocharger/Supercharger Overboost Condition

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Study Guide and Component Location Study Guide and General Description Study VGT(Variable Geometric Turbocharger) is the device which increases the efficiency of turbocharger at low rpm and lasts optimum turbo efficiency at high rpm as varying the cross sectional area through which exhaust gas passes turbocharger impeller. It relieves turbo lag at low speed and increse engine power generation. Study Engine speed, APS signal, MAFS and Boost pressure sensor data are inputted to ECM. Study ECM actuates vacuum diafragm which controls exhaust gas line as controlling VGT actuator duty to maintain optimum state of air compression. Study Guide and DTC Description Study P0234 is set when real boost pressure is much lower than target boost pressure for more than 15 sec. at above 1750RPM and 10~22mg/hub of fuel injection quantity. Study This code is due to poor connection of VGT solenoid valve vacuum hose, vacuum leakage, clogging, VGT turbo charger component failure. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Signal monitoring • VGT solenoid component • VGT vacuum line • VGT turbo charger component Study Enable Conditions • Engine running (at above 1750RPM and 10~22mg/hub of fuel injection quantity) Study Threshold Value • Real boost press. is much lower than target boost press. Study Diagnostic Time • 15 sec. Study Fail Safe Fuel cut NO • - EGR Off YES Fuel Limit YES Check Lamp ON Specification VGT Actuator Component Resistance VGT Actuator Operating Hz VGT Actuator Operating Duty 14.7 ~ 16.1Ω (20°C) 300Hz 76% at idle, decreases as accelerating Signal Waveform & Data Fig.1) VGT actuator output waveform at 79% duty( (-)duty ). Duty decreases as boost pressure increases. Fig.2) VGT actuator duty( (-)duty ) decreases as accelerating.

How to Check the Secondary Fuel Pump of CRDI?

How to Check the Secondary Fuel Pump of CRDI?

 

How to Check the Secondary Fuel Pump of Fuel Pump?

 

Model: Hyundai Cars

Fuel: Diesel

Year of Model:2011

Displacement: 2000cc

2011  D 2.0 CRDI  Engine  Engine Control P0231 Fuel Pump Secondary Circuit Low

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Study Guide and Component Location Study Guide and General Description Study Vain pump type fuel pump which is driven by electric motor is applied to this vehicle. Study Fuel pump which is installed inside of fuel tank supplies fuel to high pressure pump. Study ECM controls Fuel pump relay to supply power to low pressure fuel pump. Study The relay operates for 1.5 sec. for the diagnosis fuel pump relay at IG KEY ON, then if engine speed above 45rpm is detected by CKPS, relay turns ON and fuel is supplied to high pressure pump. Study Guide and DTC Description Study the P0231 is set when no current or excessively low current is detected in fuel pump relay control circuit for more than 1 sec. Study at Fuel pump relay ON condition. This code is due to open or short to ground in glow relay control circuit or internal open in Fuel pump relay component. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Voltage monitoring • Fuel pump relay control circuit • Fuel pump relay component Study Enable Conditions • IG KEY "ON" (monitoring only performed within relay operating condition) Study Threshold Value • Short to GND • Wiring open Study Diagnostic Time • 1.0 sec. Fail Safe Fuel cut NO • - EGR Off NO Fuel Limit NO Check Lamp OFF Specification Relay Coil Resistance Motor Type Pumping Pressure 75±10Ω(20°C) Electric motor type vein pump 4 - 5 bar Study Guide , Study Guide , Study Guide , Study Guide , Study Guide , Study Guide

How to Repair my Sonata Engine not Start.

How to Repair my Sonata Engine not Start.

 

How to Repair my Sonata Engine not Start.

Model: Hyundai Sonata YF

Year of Model: 2011

Fuel: Gasoline

Displacement: 2400cc

 

1) Study Guide and Condition:

• Study Engine not Starting unless shake the shifting lever.
• Study Intermittent Shock Shifting During Driving.

2) Study Guide and Cause:

• Due to Transmission Range Switch Internal Loose Contact.

3) Diagnosis :

1. Study Scan tool Check
   = Transmission Range Switch.
2. Study Check Shifting lever 3x then the problem occurs.
3. Study Replace with Goo TR switch the make testing.= OK

4) Study Guide and Repair Parts

1. Replace TR switch

How Code P0101 Sets a Trouble?

How Code P0101 Sets a Trouble?

 

2011  D 2.0 CRDI  Engine  Engine Control  P0101 Mass or Volume Air Flow Circuit Range/Performance

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Component Location Study guide and General Description Study Mass Air Flow Sensor (MAFS) is digital sensor. Study Measuring mass of air flow, signal is outputted as frequency(Hz). ECM performs EGR system feed back control with the information of measured mass air flow. Study (The role of MAFS in diesel engine is different from gasoline engine. Fuel injection quantity is decided by MAFS signal in gasoline engine.) Study When the amount of EGR gas(contains no oxygen) flowing into combustion chamber increases, the air passing through MAFS(contains oxygen) decreases. Study Thus, with the output signal change of MAFS accompanied by EGR actuator actuation, ECM determines the amount of recirculated EGR gas quantity. Study Guide Notice Study NOx is produced in the reaction of nitrogen and oxygen. Study If least intake air required for complete combustion flows into combustion chamber by controlling EGR gas(contains no oxygen) Study which is recirculated to combustion chamber, NOx decreases because there is no supplementary oxygen to react with nitrogen. Study Guide and DTC Description P0101 is set 1)Study when Air mass ratio(real/threshold) above 1.5 or below 0.85 is detected for more than 10 sec.. or 2) short to battery or ground in MAFS or IATS signal circuit is detected for more than 0.58 sec. or 3) short to low or high voltage line in IATS signal circuit is detected for more than 0.6 sec. DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Voltage monitoring • MAFS circuit • MAFS component Study Enable Conditions • Engine running Study Threshold Value • Air mass ratio(real/threshold) above 1.5 or below 0.85 - 12 sec. • Short to low or high voltage line in IATS signal circuit - 0.6 sec. • Shrot to battery or ground in MAFS or IATS circuit - 0.58 sec. Study Diagnostic Time • Refer to threshold Value. Study Fail Safe Fuel cut NO • - Study EGR Off YES Study Fuel Limit YES Study Check Lamp OFF

How CRDI Engine & Code P0182 Works?

How CRDI Engine & Code P0182 Works?

 

2011  D 2.0 CRDI  Engine  Engine Control

How CRDI Engine & Code P0182 Works?

P0182 Fuel Temp Sensor A Circuit Low Input

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Study Guide and Component Location Study Guide and General Description Study Fuel Temperature Sensor is NTC thermistor installed in fuel supplying line. It Study senses the temperature of fuel supplied to high pressure pump. Study Fuel temperature is limited (engine power is limited) to keep fuel temperature from reaching at 120°C. This Study limit is to protect fuel line such as high pressure pump and injectors from damages due to rapid deterioration by vapor-lock phenomenon which can occur at high temperature or destruction of oil membrane. Study Guide and DTC Description P0182 is set when the voltage below 0.053V - minimum voltage of FTS output - is detected for more than 2.0 sec.. This code is due to short to ground in FTS signal circuit. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy   • Voltage monitoring • FTS circuit • FTS component Study Enable Conditions • IG KEY "ON" Study Threshold Value • When output signal is below the minimum value.(below 0.053V)   Study Diagnostic Time • 2.0 sec. Fail Safe Fuel cut NO • Fuel temp. fixed at 85°C EGR Off NO Fuel Limit NO MIL OFF Specification Tmeaueeprtr -3°C 0 -2°C 0 -0-0 00 2°C0 Resistance 22.22~31.78kΩ 13.24~18.10kΩ 8.16~10.74kΩ 5.18~6.60kΩ 2.27~2.73kΩ Temperature 40°C 50°C 60°C 70°C   Resistance 1.059~1.281kΩ 0.748~0.904kΩ 0.538~0.650kΩ 0.392~0.476kΩ   Diagnostic Circuit Diagram

How to Know the Defective Airflow?

How to know the Defective Airflow?

 

How to Know the Defective Airflow?

Model: Hyundai I30

Year of Model: 2011

2011  D 2.0 CRDI  Engine  Engine Control

Fuel: Diesel

Displacement: 2000cc

P0101 Mass or Volume Air Flow Circuit Range/Performance

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Study Guide and Component Location Study Guide and General Description Study Mass Air Flow Sensor (MAFS) is digital sensor. Measuring mass of air flow, signal is outputted as frequency(Hz). Study ECM performs EGR system feed back control with the information of measured mass air flow. (The role of MAFS in diesel engine is different from gasoline engine. Study Fuel injection quantity is decided by MAFS signal in gasoline engine.) Study When the amount of EGR gas(contains no oxygen) flowing into combustion chamber increases, the air passing through MAFS(contains oxygen) decreases. Thus,with the output signal change of MAFS accompanied by EGR actuator actuation, ECM determines the amount of recirculated EGR gas quantity. Study NOx is produced in the reaction of nitrogen and oxygen. Study If least intake air required for complete combustion flows into combustion chamber by controlling EGR gas(contains no oxygen) which is recirculated to combustion chamber, NOx decreases because there is no supplementary oxygen to react with nitrogen. Study Guide and DTC Description P0101 is set 1) when Air mass ratio(real/threshold) above 1.5 or below 0.85 is detected for more than 10 sec.. or 2) short to battery or ground in MAFS or IATS signal circuit is detected for more than 0.58 sec. or 3) short to low or high voltage line in IATS signal circuit is detected for more than 0.6 sec. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Voltage monitoring • MAFS circuit • MAFS component Study Enable Conditions • Engine running   Study Threshold Value • Air mass ratio(real/threshold) above 1.5 or below 0.85 - 12 sec. • Short to low or high voltage line in IATS signal circuit - 0.6 sec. • Shrot to battery or ground in MAFS or IATS circuit - 0.58 sec. Study Diagnostic Time • Refer to threshold Value. Fail Safe Fuel cut NO • - EGR Off YES Fuel Limit YES Check Lamp OFF Specification Intake air quantity (Kg/h) Output frequency ( KHz ) Deviation [ % ] 20°C 80°C 8 1.97 ± 3 10 2.01 2.01 ± 2 40 2.50 2.50 ± 2 105 3.20 3.20 ± 2 220 4.30 ± 2 480 7.80 7.80 ± 2 560 9.50 ± 3 Study , Study , Study , Study , Study , Study , Study , Study , Study , Study , Study

How SJB Affects the Head Light of Sonata Code B2510.

How SBJ Affects the Head Light of Sonata Code B2510

 

How SBJ (Smart Junction Box) Affects the Head light of Sonata Code B2510.

2011  G 2.4 DOHC  BCM  Smart Junction Box  B2510 Right Headlamp High Circuit Short to Ground

General Description Study Once BCM receives head lamp high switch working signal, it sends the signal to SJB by CAN communition. SJB turns on headlamp high. Study Guide and DTC Description Study This code is set when head lamp high right circuit is shotted to ground for more than 150ms during right head lamp high operating. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Load Mornitoring • Poor connection • Short to ground in head lamp high right circuit • Faulty right head lamp high • Faulty SJB Study Enable Conditions • IG KEY ON. Study Threshold Value • It is abnormal if output voltage is 0V. • Head Lamp High right Circuit Short To Ground Study Diagnostic Time • Immediately Study DTC Erasing Time • DTC is erased immediately after trouble fixed.

How to Replace and Check CVVT.

How to Replace and Check CVVT.

 

How to Replace and Check CVVT.

Model: Hyundai Genesis BH

Year of Model: 2010

Fuel: Gasoline

Displacement: 4600cc

How to Replace and Check CVVT.

2011  G 4.6 DOHC Engine  Engine Control  P0085 Exhaust Valve Control Solenoid Circuit Low (Bank 2)

Study Guide and Component Location Study Guide and General Description Study The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. Study This system controls the intake camshaft to provide the optimal valve timing for every driving condition. Study The ECM controls the Oil Control Valve(OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. Study The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, Study the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under overall driving conditions. Study guide and DTC Description Study When ECM detects short to ground in OCV(Bank 2-EX) control circuit, ECM sets DTC P0085. Study guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Power stage diagnosis(Exhaust) • Poor Connection • Open or Short to ground in power circuit • Open in control circuit • OCV Enable Conditions • - Study Threshold value   • Short circuit to ground Diagnosis Time Study • Continuous MIL On Condition • 2 Driving Cycles Study Specification Item Specification Resistance (Ω) 6.7 ~ 7.7 at 20°C(68°F) Study Signal Waveform & Data Fig.1) Normal waveform of OCV at idle. Fig.2) Normal waveform of OCV at acceleration.

How to Replace Output Sensor?

How to Replace Output  Sensor?

 

2010  G 1.6 DOHC  Transmission  Automatic Transaxle  P0722 A/T Output speed Sensor Circuit - Open or Short(GND)

Study Guide and Component Location Study Guide and General Description Study The Output Speed Sensor outputs pulse-signals according to the revolutions of the output shaft of the transmission. Study The Output Speed Sensor is installed in front of the Transfer Drive Gear to determine the Transfer Drive Gear rpms by counting the frequency of the pulses. Study This value, together with the throttle position data, is mainly used to decide the optimum gear position. Study Guyide and DTC Description Study The TCM sets this code if the calculated value of the pulse-signal is noticeably different from the value calculated, using the Vehicle Speed Sensor output, when the vehicle is running faster than 30 km/h. Study The TCM will initiate the fail safe function if this code is detected. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause DTC Strategy Study ● Speed rationality check ● Signal circuit is open or short. ● Sensor power circuit is open ● Sensor ground circuit is open ● Faulty OUPUT SPEED SENSOR ● Faulty PCM Study Enable Conditions ● Battery Voltage ≥ 10V ● Lever position : D,3,2,L ● State of brake : OFF Study Threshold Value ● Output speed = 0 Study Diagnostic Time ● More than 1sec Study Fail Safe ● Locked into 3rd or 2nd gear. ● Manual shifting is possibe(2 nd → 3 rd ,3 rd → 2 nd) Study Specification Input shaft & Output shaft speed sensor ● Type : Hall sensor ● Current consumption : 22mA(MAX) ● sensor body and sensor connector have been unified as one. Signal Waveform

2010  G 1.6 DOHC  Transmission  Automatic Transaxle  P0722 A/T Output speed Sensor Circuit - Open or Short(GND)

Study Guide and Terminal and Connector Inspection 1. Study Many malfunctions in the electrical system are caused by poor harness and terminals. Faults Study can also be caused by interference from other electrical systems, and mechanical or chemical damage. 2. Study Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. 3. Study Has a problem been found?   YES 1) Repair as necessary and go to "Verification Vehicle Repair" procedure   NO 1) Go to "Signal Circuit Inspection" procedure Study Guide and Signal Circuit Inspection 1. Study Ignition "ON" & Engine "OFF". 2. Study Disconnect the "OUTPUT SPEED SENSOR" connector 3. Study Measure voltage between terminal "2" of the OUTPUT SPEED SENSOR harness connector and chassis ground. A. Specification : Approx. 5V 4. Study Is voltage within specifications ?   YES 1) Study Go to "Power Circuit Inspection" procedure   NO 1) Study Check for open or short in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure 2) Study If signal circuit in harness is OK, Go to "Check PCM/TCM" of the "Component Inspection" procedure. Study Power Supply Circuit Inspection 1. Study Ignition "ON" & Engine "OFF". 2. Study Disconnect the "OUTPUT SPEED SENSOR" connector 3. Study Measure voltage between terminal "3" of the OUTPUT SPEED SENSOR harness connector and chassis ground. A. Specification : Approx. B+ 4. Study Is voltage within specifications ?   YES 1) Study Go to "Ground Circuit Inspection" procedure   NO 1) Study Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure Study Guide and Ground Circuit inspection 1. Study Ignition "ON" & Engine "OFF". 2. Study Disconnect the "OUTPUT SPEED SENSOR" connector 3. Study Measure resistance between terminal "1" of the OUTPUT SPEED SENSOR harness connector and chassis ground. A. Specification : Approx. 0 Ω 4. Study Is resistance within specifications ?   YES 1) Study Go to "Component Inspection" procedure   NO 1) Study Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure 2) Study If ground circuit in harness is OK, Go to "Check PCM/TCM" of the "Component Inspection" procedure

How Body CAN Communication Control B1602.

How Body CAN Communication Control B1602.

 

How Body CAN Communication Control B1602.

Model: Hyundai Sonata YF

Year of Model: 2011

Fuel: Gasoline

Displacement: 2400cc

2011  G 2.4 DOHC  BCM  Smart Junction Box  B1602 CAN Error

Study Guide and Component Location Study Guide and General Description Study This is DTC which is related with communication error between SJB and other units. ※ Body CAN communication Control Units : Study BCM(Body Control Module), CLU(Cluster), PDM(Power Distribution Module), SMK(Smart Key), SJB(Smart Junction Box). *¹ CAN (Controller Area Network) : Study CAN is serial bus communication type which links not only communication system but also control units each other. DTC Description Type Condition Remark 1 Study CANH Circuit Open B1602 is presented when IC detects one of errors among 7 types under normal communication condition. According to operation condition, some of module which are connected to CAN line may not detect B1602.Also, B1603 can be detected together. 2 Study CANL Circuit Open 3 Study CANH Circuit Short to Power 4 Study CANL Circuit Short to Power 5 Study CANH Circuit Short to Ground 6 Study CANL Circuit Short to Ground 7 StudyCANH and CANL Short to each other DTC Detecting Condition Item Detecting Condition Possible Cause DTC Strategy Study • CAN Communication Check • SJB are not Sleep condition 1. CAN High Line short to battery 2. CAN Low Line short to battery 3. CAN High Line short to ground 4. CAN Low Line short to ground 5. CAN High and Low line short to each other 6. CAN High Line short to 5V power 7. CAN High L Study Enable Conditions • SJB power on (Under normal communication) Study Threshold Value • CAN high : 0V or B+ • CAN low : 0V or B+ Study Diagnostic Time • 2 sec Study DTC Erasing Time • DTC is erased immediately after trouble fixed

How to Repair Code B1603 of BCM?

How to repair Code B1603 of BCM?

 

Model: Hyundai Sonata YF

Year of Model: 2011

Fuel : Gasoline

Displacement: 2400cc

How to Repair Code B1603 of BCM?

2011  G 2.4 DOHC  BCM  Cluster Module  B1603 CAN Communication Bus Off

Study Guide and Component Location Study Guide and General Description his is DTC which is related with communication error between CLU and other units. ※Study Body CAN communication Control Units : BCM(Body Control Module), CLU(Cluster), PDM(Power Distribution Module), SMK(Smart Key), SJB(Smart Junction Box). *¹Study CAN (Controller Area Network) : CAN is serial bus communication type which links not only communication system but also control units each other. Study Guide and DTC Description Study This is DTC which is related with communication error between IPM and other units. (※Study Guide Control Units : IPM(Inter Panel Module), FAM(Front Area Module), PDM(Power Distribution Module), DDM(Drive Door Module), ADM(Assist Door Module), ECW(Electronic Control Wiper), CLU(Cluster), MFSW(Multi Function Switch), PSM(Power Seat Module), SCM(Steering Control Module), PTM(Power Trunk Lid Module), FBWS(Front Back Warning System)) Case1: Study After short between CLU CAN Low Line and High Line, short to ground together. Case2: Study After short between CLU CAN Low Line and High Line, short to power together. ※Study This code is occurred when It is not possible to transmit data by CAN Line in those way of Software and Hardware. But, It is possible to receive data by CAN Line. Study This code reports BUS OFF status when data transmit error count number is over 255. The purpose is to verify the status of CAN controller and CAN communication line when error is detected. Study According to operation condition, some of module which are connected to CAN line may not detect B1603. Also, B1602 coincides with B1603 at all times. Study Guide   Difference between CAN ERROR and CAN BUS ERROR CAN Error : MIL On, CAN Bus Error : No MIL Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause DTC Strategy Study • CAN Communication Check • BCM, CLU are not Sleep condition 1. CAN High and Low Line short to ground coincident 2. CAN High and Low Line short to battery coincident Enable Conditions Study • BCM, CLU power on Threshold Value Study • CAN High/Low : 0V or B+ Diagnostic Time Study • Immediately DTC Erasing Time Study • DTC is erased immediately after trouble fixed

How P0075 Code Works?

How P0075 Code Work?

 

How P0075 Code Works?

Model: Hyundai Genesis & Equus VI

Year of Model:2011

Fuel: Gasoline

Displacement: 4600cc

 

P0075 Intake Valve Control Solenoid Circuit (Bank 1)

Component Location P0075 Intake Valve Control Solenoid Circuit (Bank 1)     Study Guide and Component Location Study and General Description Study Guide The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. Study This system controls the intake camshaft to provide the optimal valve timing for every driving condition. Study The ECM controls the Oil Control Valve(OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. Study The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV. Study As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under overall driving conditions. DTC Description When ECM detects open in the OCV(Bank 1-IN) control circuit, ECM sets DTC P0075. DTC Detecting Condition Item Detecting Condition Possible Cause DTC Strategy • Circuit continuity check, open • Poor Connection • Open or Short to ground in power circuit • Open in control circuit • OCV Enable Conditions • - Threshold value • Open Diagnosis Time • Continuous MIL On Condition • 2 Driving Cycles Specification ITEM Specification Resistance (Ω) 6.7 ~ 7.7 at 20°C(68°F) Diagnostic Circuit Diagram Signal Waveform & Data Fig.1) Normal waveform of OCV at idle. Fig.2) Normal waveform of OCV at acceleration. Study and General Description The Study of CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. This Study system controls the intake camshaft to provide the optimal valve timing for every driving condition. The Study of ECM controls the Oil Control Valve(OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. Study The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV. Study As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under overall driving conditions. Study and DTC Description Study When ECM detects open in the OCV(Bank 1-IN) control circuit, ECM sets DTC P0075. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause DTC Strategy Study • Circuit continuity check, open • Poor Connection • Open or Short to ground in power circuit • Open in control circuit • OCV Enable Conditions Study • - Threshold value Study • Open Diagnosis Time Study • Continuous MIL On Condition Study • 2 Driving Cycles Study Guide Specification ITEM Specification Resistance (Ω) 6.7 ~ 7.7 at 20°C(68°F) Study Guide and Signal Waveform & Data Fig.1) Normal waveform of OCV at idle. Fig.2) Normal waveform of OCV at acceleration.