Circuit/System Verification

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

NOTE:

If you were sent here from DTC P0068, P0097, P0106, P0121, P1101 - Refer to: Circuit/System Testing.

Ignition - On / Vehicle - In Service Mode
Verify DTC P0641, P0651, P0697, P06A3, P06D2 is not set.
- If any of the DTCs are set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If none of the DTCs are set
Verify the scan tool parameter: Throttle Body Idle Air Flow Compensation = Less than 90%
- If greater than 90%
  Refer to: Throttle Body Inspection and Cleaning
- Go to next step: If less than 90%
Perform the scan tool control function: Throttle Sweep - Start
Verify the scan tool parameter: Throttle Position Sensors 1 and 2 = Agree
- If not the specified state
  Refer to: DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135
- Go to next step: If the specified state
Verify the scan tool parameter: MAP Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
- If not in the specified range
  Refer to: DTC P0106, P0107, or P0108
- Go to next step: If in the specified range
Engine - Idling - At normal operating temperature
Verify the scan tool parameter: MAP Sensor = 26 to 52 kPa (3. 8 to 7. 5 PSI) - The value should change with accelerator pedal input.
- If not in the specified range or does not change
  Refer to: DTC P0106, P0107, or P0108
- Go to next step: If in the specified range and changes
Verify the scan tool parameter: MAF Sensor = 2. 5 to 5. 5 g/s
- If not in the specified range
  Refer to: Circuit/System Testing
- Go to next step: If in the specified range
Increase the engine speed slowly to 3k RPM and then back to idle.
Perform the scan tool function: Review Stored Data
Observe the scan tool parameter frame by frame with a scan tool: MAF Sensor
Verify the scan tool parameter: MAF Sensor = The value should not spike or drop out.
- If the value spikes or drops out
  Refer to: Circuit/System Testing
- Go to next step: If the value does not spike or drop out
Ignition/Vehicle & All vehicle systems - Off
Verify the following conditions do not exist:
- B74 Manifold Absolute Pressure Sensor - Leaking@O-Ring - Missing/Visible Damage
- B75C Multifunction Intake Air Sensor - Contamination of the measuring element/Cracked/Loose Clamps/Water intrusion
- Q38 Throttle Body
  - Coking/Loose Clamps/Visible Damage
  - Restricted - Moisture/Ice
- Air Cleaner Element - Dirty/Restricted
- Engine - Mechanical Condition - Refer to: Symptoms - Engine Mechanical
- Exhaust System - Leaking/Restricted/Visible Damage - Refer to: Symptoms - Engine Exhaust
- Intake Air Duct - Collapsed/Loose Clamps/Restricted/Visible Damage
- Intake Manifold - Cracked/Loose Clamps/Visible Damage - Refer to: Intake Manifold Cleaning and Inspection
- Positive Crankcase Ventilation System
  - Leaking@O-Ring - Missing/Visible Damage
  - Restricted - Moisture/Ice
  - Incorrect connection - Leaking/Restricted - Refer to: Crankcase Ventilation System Inspection/Diagnosis
- Vacuum Hoses - Incorrect connection/Kinked/Leaking/Restricted
- Vacuum leak@Engine - Oil Level Indicator and Tube/Oil Filler Cap
- 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 is set
  Refer to: Circuit/System Testing
- Go to next step: If the DTC is not set
All OK.