Circuit/System Verification
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On / Vehicle - In Service Mode
- Verify DTC P0106, P0107, P0108, P2227, P2228, P2229, P2230 is not set.
- If any of the DTCs are set
- 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 90% or greater
Refer to: Throttle Body Cleaning
- Go to next step: If less than 90%
- If 90% or greater
- Verify the following conditions do not exist:
- Loose clamps, cracks, or other damages to the intake system.
- Clogged air cleaner.
- Clogged catalyst.
- Vacuum hoses with kinks, leaks, or improper connections.
- Leaking or restricted positive crankcase ventilation.
- Leaks at the intake manifold or throttle body.
- Leaking, missing, or damaged O-ring on the components listed below:
- B17 Barometric Pressure Sensor
- B74 Manifold Absolute Pressure Sensor
- If a condition exists
Repair or replace as necessary.
- Go to next step: If no condition exists
- Verify the scan tool parameter:
- BARO Sensor = Altitude Versus Barometric Pressure - The value should be within the range listed in the table.
- MAP Sensor = Altitude Versus Barometric Pressure - The value should be within the range listed in the table.
- If not in the specified range
- {BARO Sensor} Refer to: DTC P2227-P2230 .
- {MAP Sensor} Refer to: DTC P0106, P0107, or P0108 .
- Go to next step: If in the specified range
- All OK.