Circuit/System Testing
WARNING: This page is about a different car, the 2008 Pontiac G8. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connectors at the ECM.
- Ignition OFF, and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit terminals listed below and ground.
- Terminal 1 X2 (3.6L)
- Terminal 2 X2 (3.6L)
- Terminal 4 X2 (3.6L)
- Terminal 73 X1 (6.0L)
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition On, verify that a test lamp illuminates between the IGN/B+ circuit terminals listed below and ground:
- Terminal 4 X2 (3.6L)
- Terminal 5 X2 (3.6L)
- Terminal 6 X2 (3.6L)
- Terminal 54 X2 (3.6L)
- Terminal 56 X2 (3.6L)
- Terminal 19 X1 (6.0L)
- Terminal 20 X1 (6.0L)
- Terminal 47 X1 (6.0L)
- If the test lamp does not illuminate, test the IGN/B+ circuit for a short to ground or an open/high resistance.
- If all circuits test normal, replace the ECM.