Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the Secondary Air Solenoid.
- Ignition OFF for 2 minutes and the scan tool powered OFF, test for less than 5 Ω between the ground circuit terminal 4 and ground.
- If greater than the specified range, repair the ground circuit for an open/high resistance.
- Connect a test lamp between the Air Solenoid ignition voltage circuit terminal 5 and ground.
- Ignition ON, command the Air Solenoid ON and OFF with a scan tool. The test lamp should respond to the scan tool commands.
- If the test lamp is always OFF, test the ignition circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the Air Solenoid relay.
- If the test lamp is always ON, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the Air Solenoid relay.
- Disconnect the Air hose/pipe from the Air Solenoid.
- Ignition ON, command the Air Pump ON with a scan tool. Verify airflow to the Air Solenoid.
- If there is limited or no airflow to the Air Solenoid, inspect for the following:
- Hoses/pipes for a restriction or blockage
- Hoses/pipes for being disconnected
- The Air Pump ground circuit for high resistance
- The Air Pump ignition voltage circuit for high resistance
- If a condition is located, repair as necessary.
- If a condition is not located, and the AIR pump operates with no pressure change, replace the Secondary Air Injection Pump.
- If all circuits test normal, test or replace the Air Solenoid.