Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the affected ignition coil/module.
- Ignition OFF for 90 seconds, disconnect the ECM connector X2.
- Test for an open, a high resistance, a short to ground and for a short to voltage between the ignition coil/module IC circuit terminal 3 or C and the appropriate ECM connector X2 terminal listed below:
- IC 1 circuit: terminal 22
- IC 2 circuit: terminal 26
- IC 3 circuit: terminal 23
- IC 4 circuit: terminal 24
- If a fault is found, repair the circuit as needed.
- Connect the ECM.
- Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
- Start the engine and observe the scan tool.
- If the DTC or the misfire transfers with the suspect ignition/coil module, replace as needed.
- If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM.