Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Ignition ON.
Verify the manifold absolute pressure sensor is within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure
- If not within the specified range
  Refer to DTC P0106
- If within the specified range
Engine running at the operating temperature.
Verify the Long Term Fuel Trim parameter is between -21% and +38.5%.
- If greater than +38.5%
1. Ignition OFF.
2. Inspect for the conditions listed below:
  - Mass air flow (MAF) sensor signal skewed-If the Short Term Fuel Trim parameter changes greater than 20% when the MAF sensor is disconnected, refer to DTC P0101: Mass Air Flow (MAF) Sensor (LEA) .
  - Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
  - Missing, restricted, or leaking exhaust components-Refer to Symptoms - Engine Exhaust .
  - Malfunctioning fuel injectors-Refer to Fuel Injector Solenoid Coil Test .
  - Vacuum hoses for splits, kinks, and improper connections
  - Insufficient fuel in the tank
  - Low fuel pressure-Refer to Fuel System Diagnosis .
  - Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.
  - Leaks in the air induction system and the air intake ducts
  - Leaks in the components of the vacuum operated engine mount system
  - Missing air filter element
  - Cracked EVAP canister
  - Evaporative pipes obstructed or leaking
  - The crankcase ventilation system for leaks-Refer to Crankcase Ventilation System Inspection/Diagnosis (Without Turbocharger) .
    - If a condition is found, repair as necessary.
    - If no condition is found, inspect the engine for a mechanical condition. Refer to Symptoms - Engine Mechanical .
- If less than -21%
1. Ignition OFF.
2. Inspect for the conditions listed below:
  - Mass air flow (MAF) sensor signal skewed-If the Short Term Fuel Trim parameters for both banks changes greater than 20% when the MAF sensor is disconnected, refer to DTC P0101: Mass Air Flow (MAF) Sensor (LEA) .
  - Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
  - Missing, restricted, or leaking exhaust components-Refer to Symptoms - Engine Exhaust .
  - Malfunctioning fuel injectors-Refer to Fuel Injector Solenoid Coil Test
  - Collapsed or restricted air intake duct
  - Excessive fuel pressure - Refer to Fuel System Diagnosis
  - Dirty or restricted air filter
  - Objects blocking the throttle body
  - Improper operation of the evaporative emissions control system
  - Excessive fuel in the crankcase-Change the engine oil as necessary.
- If a condition is found, repair as necessary.
- If no condition is found, inspect the engine for a mechanical condition. Refer to Symptoms - Engine Mechanical .
- If between -21% and +38.5%
All OK.