Circuit/System Testing
WARNING: This page is about a different car, the 2010 Chevrolet Malibu. 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 ohms between the appropriate ground circuit terminal listed below and ground.
- Terminal 73 X1 (LZ4)
- Terminal 73 X2 (LAT, LE5, LY7)
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Verify that a test lamp illuminates between the B+ circuit terminal 20 X1 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
- Install a 3A jumper wire between the appropriate PWR/TRN relay control circuit terminal listed below and ground.
- Terminal 13 X1 (LE5)
- Terminal 40 X1 (LAT, LY7)
- Terminal 59 X1 (LZ4)
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals listed below and ground.
- Terminal 3 X1 (LE5)
- Terminal 18 X1 (LAT, LY7, LZ4)
- Terminal 19 X1 (all engines)
- Terminal 47 X1 (LZ4)
- Terminal 73 X1 (LE5)
- Terminal 13 X2 (LAT, LY7)
- If all circuits test normal, replace the ECM.