Circuit/System Verification

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

NOTE:

If you were sent here from DTC P00C7, P0068, P0097, P0121, P1101, P2227 - Refer to: Circuit/System Testing.

Ignition - On / Vehicle - In Service Mode
Verify DTC P0641, P0651, P0697, P06A3 is not set.
- If any of the DTCs are set
  Refer to: DTC P0641, P0651, P0697, or P06A3
- Go to next step: If none of the DTCs are set
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: Circuit/System Testing
- Go to next step: If in the specified range
Verify the scan tool parameter: Throttle Body Idle Air Flow Compensation = Less than 90%
- If 90% or greater
  Refer to: Throttle Body Inspection and Cleaning
- Go to next step: If less than 90%
Verify DTC P0068, P0101, P0106, P0121, P1101 is not set.
- If any of the DTCs are set
  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 / Visible Damage/Water intrusion
- Q38 Throttle Body
  - Coking/Loose Clamps /Visible Damage
  - Restricted - Moisture/Ice
- Air Cleaner Element - Dirty / Restricted
- Catalytic Converter - Blocked / Restricted/Visible Damage
- Engine - Mechanical Condition - Refer to: Symptoms - Engine Mechanical
- Exhaust System - Leaking /Restricted/ Visible Damage - Refer to: Symptoms - Engine Exhaust
- Intake Air Duct - Cracked / Loose Clamps / Restricted / Visible Damage
- Intake Manifold - Cracked / Loose Clamps / Restricted / Vacuum leak/Visible Damage
- Positive Crankcase Ventilation System
  - Leaking @ O-Ring - Missing / Visible Damage
  - Restricted - Moisture/Ice
  - Incorrect connection /Leaking / Restricted
- Vacuum Hoses - Kinked / Leaking / Incorrect connection / 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 none of the DTCs are set
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
Engine - Idling - At normal operating temperature
Accessories - Off
Verify the scan tool parameter:
- MAP Sensor = 26 to 52 kPa (3. 8 to 7. 5 PSI)@Idle Speed
- MAP Sensor = The value should change with accelerator pedal input.
- If not between 26 and 52 kPa (3. 8 and 7. 5 PSI) or does not change
  Refer to: Circuit/System Testing
- Go to next step: If between 26 and 52 kPa (3. 8 and 7. 5 PSI) and changes
Verify the scan tool parameter: MAP Sensor = The value should not spike or drop out.
Perform the action while monitoring the parameter:
- Wiggle the harness and connector: B74 Manifold Absolute Pressure Sensor
- Wiggle the harness and connector: K20 Engine Control Module
- If the value spikes or drops out
  Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)
- Go to next step: If the value does not spike or drop out
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: DTC P0101-P0103
- Go to next step: If the value does not spike or drop out
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
  Refer to: Circuit/System Testing
- Go to next step: If the DTC does not set
All OK.