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Home >> Saturn >> 2006 >> Ion Red Line >> Repair and Diagnosis >> External Pages >> Different car >> Section 251 (Engine Controls - 2.2L - DTC P0136 To DTC P0442) >> DTC P0412 >> Circuit/System Testing

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.
  1. With the ignition ON, the engine OFF, and the solenoid enabled with a scan tool, observe the relay and the solenoid while manipulating all related wiring and connectors.
    • If manipulation does affect the relay or the solenoid then repair the harness or connector.
  2. With the ignition ON, the engine OFF, and the solenoid relay removed, connect a test lamp from the relay coil voltage supply circuit to ground and observe that the lamp illuminates.
    • If the lamp does not illuminate then test the voltage supply circuit for high resistance or a short to ground.
  3. With the ignition ON, the engine OFF, and the solenoid relay removed, connect a test lamp from the relay coil voltage supply circuit to the relay control circuit and observe that the lamp does not illuminate.
    • If the lamp illuminates then test the control circuit for a short to ground or a faulty control module.
  4. With the ignition ON, the engine OFF, the solenoid relay removed, a test lamp connected from the relay coil voltage supply circuit to the relay control circuit, and the AIR solenoid enabled with a scan tool, observe that the test lamp illuminates.
    • If the lamp does not illuminate then test the relay control circuit for high resistance, a short to voltage, or a faulty control module.
  5. If all circuits and the control module are OK then replace the solenoid relay.
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