Circuit/System Testing
WARNING: This page is about a different car, the 2006 Saturn Ion 3 and 2006 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.
- With the ignition ON, the engine OFF, and the AIR solenoid substituted with a test lamp, observe that the test lamp is not illuminated.
- If the test lamp is illuminated then test for the following:
- A short to voltage in the AIR solenoid valve voltage supply circuit
- A short to ground in the AIR solenoid valve relay control circuit
- A faulty AIR solenoid valve relay
- A faulty control module
- With the engine RUNNING, the AIR solenoid substituted with a test lamp, and the AIR solenoid enabled with a scan tool, observe that the test lamp is illuminated.
- If the test lamp is not illuminated then test for the following:
- High resistance or a short to ground in the AIR solenoid voltage supply circuit or either AIR solenoid relay voltage supply circuit
- High resistance in the AIR solenoid ground circuit
- A faulty AIR solenoid relay
- High resistance or a short to voltage in the AIR solenoid relay control circuit
- A faulty control module
- If the test lamp is not illuminated then test for the following:
- With the engine RUNNING, the AIR pump outlet hose disconnected from the AIR solenoid inlet, and the AIR pump enabled with a scan tool, observe pressurized airflow at the hose outlet.
- If pressurized airflow is not detected then test the AIR pump inlet and outlet hoses/pipes for a restriction or a faulty pump.
- Test the AIR solenoid outlet pipe for a restriction.
- If a restriction is detected then remove the restriction or replace the pipe.
- If all other circuits and components test OK then replace the AIR solenoid.