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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1696 (Engine Controls And Fuel - 3.6L (Ly7) - DTC P0010 To DTC P0232) >> DTC P0201, P0202, P0203, P0204, P0205, or P0206 >> Circuit/System Testing

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.
  1. Ignition OFF, disconnect the X110 fuel injector multi-way connector.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals A and E engine control module (ECM) harness side and ground.
    • If the test lamp does not illuminate, test the ignition circuits for a short to ground, or an open/high resistance. If the circuits test normal and the ignition circuit fuse is open, test or replace the fuel injector.
  3. Ignition OFF, connect a test lamp between the ignition circuit terminal A and the control circuit ECM harness side, of the appropriate injector listed below:
    • Injector 1 terminal B
    • Injector 2 terminal F
    • Injector 3 terminal C
    • Injector 4 terminal G
    • Injector 5 terminal D
    • Injector 6 terminal H
  4. 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.
  5. Ignition OFF, measure for 10-15 ohms on the engine harness side of X110 between the ignition circuit terminal A or E and the control circuit of the appropriate injector listed below:
    • Injector 1 terminal B
    • Injector 2 terminal F
    • Injector 3 terminal C
    • Injector 4 terminal G
    • Injector 5 terminal D
    • Injector 6 terminal H
    • If the resistance is not within the specified range, test for a short to ground or an open/high resistance between X110 and the appropriate fuel injector harness connector. If the circuits test normal, test or replace the affected fuel injector.
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