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Home >> Pontiac >> 2006 >> G6 Base, 2.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 2.4L - Troubleshooting & Diagnosis >> Fuel Injector Circuit Diagnosis >> Circuit/System Testing

Circuit/System Testing

  1. Inspect the INJ fuse.
    • If the fuse is open, repair the short to ground in the ignition 1 voltage circuit of the fuel injectors.
  2. Remove the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .
  3. Disconnect a fuel injector.
  4. With the ignition ON, engine OFF, probe the ignition 1 voltage circuit of the fuel injector with a test lamp that is connected to a good ground. The test lamp should illuminate.
    • If the test lamp does not illuminate, repair the open in the ignition 1 voltage circuit between the fuse and the splice.
  5. Remove the INJ fuse.
  6. Measure the resistance between the INJ fuse to the ignition 1 voltage circuit terminal of a fuel injector with a DMM. All wire circuit resistance should measure less than 2 ohms.
    • If the resistance is more than 2 ohms, repair the high resistance in the ignition 1 voltage circuit.
  7. Connect the J 44603  into each fuel injector connector one at a time. See Special Tools . Crank the engine.
    • If the test lamp flashes for each injector, perform the Fuel Injector Diagnosis. Refer to Fuel Injector Diagnosis .
    • If the test lamp does not flash for each injector, test for an open or a short to voltage in the control circuit of the fuel injector, an intermittent or poor connection at the engine control module (ECM) or a faulty ECM.
    • If the test lamp remains illuminated at all times for any injector circuit, test for a short to ground in the control circuit of the fuel injector or a faulty ECM.

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