Circuit/System Testing
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X105 fuel injector multi-way connector.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A ECM harness side and ground
- If the test lamp does not illuminate, test the ignition circuit for a short to ground, or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the fuel injector.
- Ignition OFF, connect a J 35616-200
between the ignition circuit terminal A and the control circuit ECM harness side, of the appropriate injector listed below:
- Injector 1 terminal C
- Injector 2 terminal D
- Injector 3 terminal E
- Injector 4 terminal F
- Injector 5 terminal G
- Injector 6 terminal H
- Engine cranking, the test lamp should flash for each injector.
- If the test lamp is always ON, test the appropriate control circuit for a short to ground. If the circuit tests normal, replace the ECM.
- If the test lamp is always OFF, test the appropriate control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition OFF, connect a test lamp between the appropriate control circuit terminal and the B+ terminal.
- If the test lamp is always ON, test the appropriate control circuit for a short to ground.
- Ignition OFF, measure for 10-15 ohms on the engine harness side of X105 between the ignition circuit terminal A and the control circuit of the appropriate injector listed below:
- Injector 1 terminal C
- Injector 2 terminal D
- Injector 3 terminal E
- Injector 4 terminal F
- Injector 5 terminal G
- Injector 6 terminal H
- If the resistance is not within the specified range, test for an open/high resistance between X105 and the appropriate fuel injector harness connector. If the circuits test normal, test or replace the affected fuel injector.