Possible causes – Faulty mass air flow sensor – Intake air leaks – Dirty mass air flow sensor – Dirty mass air filter – Mass air flow sensor harness is open or shorted – Mass air flow sensor circuit poor

Possible causes – Faulty mass air flow sensor – Intake air leaks – Dirty mass air flow sensor – Dirty mass air filter – Mass air flow sensor harness is open or shorted – Mass air flow sensor circuit poor

Possible causes – Faulty mass air flow sensor – Intake air leaks – Dirty mass air flow sensor – Dirty mass air filter – Mass air flow sensor harness is open or shorted – Mass air flow sensor circuit poor

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 harness is open shorted – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection – Heated

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 harness is open shorted – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection – Heated

Possible causes – Faulty Intake Valve Timing Control Solenoid Valve – Intake Valve Timing Control Solenoid Valve harness is open or shorted – Intake Valve Timing Control Solenoid Valve circuit poor electrical connection – Faulty Camshaft Position Sensor – Camshaft

Possible causes – Air Fuel Ratio Sensor 1 Bank 2 harness is open or shorted – Air Fuel Ratio Sensor 1 Bank 2 circuit poor electrical connection – Faulty Air Fuel Ratio Sensor 1 Bank 2 When is the code

Possible causes – ECM Harness power supply circuit is open or shorted – ECM Harness ground supply circuit is open or shorted – ECM may be faulty When is the code detected? ECM back-up RAM system does not function properly.

Possible causes – Faulty Intake Valve Timing Control Solenoid Valve Bank 1 – Intake Valve Timing Control Solenoid Valve Bank 1 harness is open or shorted – Intake Valve Timing Control Solenoid Valve Bank 1 circuit poor electrical connection Tech

Possible causes – Faulty Electric Throttle Control Actuator – Electric Throttle Control Actuator harness is open or shorted – Electric Throttle Control Actuator circuit poor electrical connection When is the code detected? Electric throttle control actuator does not function properly

Possible causes – Faulty Electric Throttle Control Actuator – Electric Throttle Control Actuator harness is open or shorted – Electric Throttle Control Actuator circuit poor electrical connection Tech notes Start by performing the “Idle Air Volume Learning Procedure”, if the

Possible causes – Fualty Throttle Control Motor relay – Throttle Control Motor relay harness is open or shorted – Throttle Control Motor relay circuit poor electrical connection When is the code detected? Engine Control Module (ECM) detect the throttle control

Possible causes – Fualty Throttle Control Motor relay – Throttle Control Motor relay harness is open or shorted – Throttle Control Motor relay circuit poor electrical connection When is the code detected? Engine Control Module (ECM) detects a voltage of

Possible causes – Faulty Throttle Control Motor – Throttle Control Motor harness is open or shorted – Throttle Control Motor circuit poor electrical connection When is the code detected? Engine Control Module (ECM) detects short both circuits between ECM and

Possible causes – Faulty Front Heated Oxygen Sensor Bank 1 – Intake air leaks – Front Heated Oxygen Sensor Bank 1 harness is open or shorted – Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection – Fuel pressure

Possible causes – Faulty Front Heated Oxygen Sensor Bank 1 – Front Heated Oxygen Sensor Bank 1 harness is open or shorted – Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection – Inappropriate fuel pressure – Faulty fuel

Possible causes – Faulty heated oxygen (O2) sensor 2 (rear) – Intake air leaks – Heated oxygen (O2) sensor 2 (rear) harness is open or shorted – Heated oxygen (O2) sensor 2 (rear) circuit poor electrical connection – Inappropriate fuel

Possible causes – Faulty heated oxygen (O2) sensor 2 (rear) – Intake air leaks – Heated oxygen (O2) sensor 2 (rear) harness is open or shorted – Heated oxygen (O2) sensor 2 (rear) circuit poor electrical connection – Inappropriate fuel

Possible causes For Models before 2005: – Faulty Heated Oxygen Sensor 1 Bank 1 – Heated Oxygen Sensor 1 Bank 1 circuit is open or shorted – Heated Oxygen Sensor 1 Bank 1 circuit electrical connection When is the code

Possible causes – Front Heated Oxygen Sensor Bank 2 – Front Heated oxygen sensor 1 heater – Fuel pressure – Injectors – Intake air leaks Tech notes If there are no intake air leaks, the most likely cause of the