Circuit/System Verification

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

Ignition - On/Vehicle - In Service Mode
Verify there are no DTCs set related to the following component/system:
- B23 Camshaft Position Sensor
- B34 Engine Coolant Temperature Sensor
- B52 Heated Oxygen Sensor
- B66 Intake Air Temperature Sensor
- B74 Manifold Absolute Pressure Sensor
- B75C Multifunction Intake Air Sensor
- Q17 Fuel Injector
- Q38 Throttle Body
- Engine Misfire
- Evaporative Emission (EVAP) System
- Fuel Trim System
- If a related DTC is set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If a related DTC is not set
Engine - Idling - At Operating Temperature
Verify the scan tool parameter: MAP Sensor = 19 to 42 kPa (2.7 to 6 PSI)
- If not between 19 and 42 kPa (2.7 and 6 PSI)
  Refer to: DTC P0068, P0101, P0106, P0121, P0236, or P1101
- Go to next step: If between 19 and 42 kPa (2.7 and 6 PSI)
Ignition - On/Vehicle - In Service Mode
Verify the following conditions do not exist:
- Exhaust System - Leaking/Missing components/Restricted - Refer to: Symptoms - Engine Exhaust
- Fuel - Contaminated/Poor Quality - Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
- Fuel Injectors - Leaking/Restricted - Refer to: Fuel Injector Diagnosis
- Ignition System - Malfunction - Refer to: Electronic Ignition System Diagnosis
- Intake Air Duct - Loose Clamps/Leaking/Restricted/Visible Damage
- Intake Manifold - Leaking
- Mass Airflow Sensor - Contamination of the measuring element/Water intrusion
- Mechanical Condition@Engine - Altered air flow
  For example:
  - Cylinder Head@Intake PortorExhaust Port - Restrictions/Casting Flash
  - Intake Manifold - Restrictions/Casting Flash/Vacuum leak
  - Intake Valve or Exhaust Valve - Stuck/Leaking
  - Lock Pin@Valve Rocker Switching Arm - Broken/Stuck
  - Valve Rocker Switching Arm - Binding or Sticking/Mechanically stuck/Visible Damage/Worn
- Positive Crankcase Ventilation System - Incorrect connection/Leaking/Restricted
- Vacuum Hoses - Incorrect connection/Kinked/Leaking/Restricted
- If a condition exists
  Repair or replace as necessary
- Go to next step: If no condition exists
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
  A condition with the system still exists - Repeat the procedure starting at step 3
- Go to next step: If no DTC is set
All OK.