Circuit/System Verification

If any other AIR DTCs are set, perform those diagnostics first.
With the ignition ON and the engine OFF, observe that the AIR pump is not operating.
- If the AIR pump is operating, test for the following:
  - A short to voltage in the AIR pump voltage supply circuit
  - A faulty AIR pump relay
  - A short to ground in the AIR pump relay control circuit
  - A faulty control module
With the ignition ON, the engine OFF, and the AIR pump enabled with a scan tool, observe that the AIR pump is operating.
- If the AIR pump is not operating, test for the following:
  - Resistance greater than 2 ohms in the AIR pump voltage supply or ground circuits
  - High resistance or a short to ground in either AIR pump relay voltage supply circuit
  - High resistance or a short to voltage in the AIR pump relay control circuit
  - A faulty AIR pump relay
  - A faulty AIR pump
  - A faulty control module
With the engine running, enable the AIR pump with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 20-25 kPa above barometric pressure (BARO).
- If not equal to approximately 20-25 kPa above BARO, proceed with Circuit/System Testing.
With the engine running, enable the AIR solenoid with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 8-10 kPa above BARO.
- If not equal to approximately 8-10 kPa above BARO, proceed with Circuit/System Testing.