Circuit/System Verification
- If DTCs P0641 or P0651 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
- Engine running, observe that the AIR Pressure Sensor parameter approximately equals BARO.
- Engine running, enable the AIR pump relay and observe that the AIR Pressure Sensor parameter increases from approximately BARO to approximately 10-20 kPa above BARO.
- If less than the specified range, verify that the AIR pump is activating.