Circuit/System Verification
- If any Secondary Air Injection System Pressure Sensor Circuit DTCs are set then perform those diagnostics first.
- Inspect the AIR hoses/pipes between the pump and the shut-off valve for leaks.
- With the engine RUNNING, enable the AIR pump and observe that the AIR Pressure Sensor parameter increases to approximately 20-25 kPa above BARO.
- If the AIR pressure sensor parameter does not transition correctly then proceed with Circuit/System Testing.