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.
NOTE:
If you were sent here from DTC P0068, P0101, P0106, P1101 - Refer to: Circuit/System Testing.
- Ignition - On / Vehicle - In Service Mode
- Verify DTC P0601-P0606, P06A3, P16F3 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 DTC P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, P2135 is not set.
- If only DTC P0122, P0123, P0222, P0223, P2135 is set
Replace the component: Q38 Throttle Body
- If DTC P16A0, P16A1, P016A2 and one or more of the DTCs P0122, P0123, P0222, P0223, P2135 is set
Refer to: Circuit/System Testing
- Go to next step: If none of the DTCs are set
- If only DTC P0122, P0123, P0222, P0223, P2135 is 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
Replace the component: Q38 Throttle Body
- Go to next step: If the specified state
- If not the specified state
- Verify DTC P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, P2135 is not set.
- If any of the DTCs are set
Refer to: Circuit/System Testing
- Go to next step: If none of the DTCs are set
- If any 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: DTC P0106, P0107, or P0108
- Go to next step: If in the specified range
- If not in the specified range
- Engine - Running
- Verify the scan tool parameter: MAP Sensor = 22 to 52 kPa (3. 2 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
- If not in the specified range or does not change
- Observe the scan tool parameter: MAF Sensor & Engine Speed.
- Increase the engine speed slowly to 3, 000 RPM and then back to idle.
- Verify the scan tool parameter: MAF Sensor = The value should change smoothly and gradually as the engine speed is increased and decreased.
- If the value does not change smoothly and gradually
Refer to: DTC P0101-P0103
- Go to next step: If the value changes smoothly and gradually
- If the value does not change smoothly and gradually
- 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
- If the DTC sets
- All OK.