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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 706 (Engine Controls And Fuel - 2.4L - Diagnosis & Troubleshooting) >> Fuel Injector Circuit Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  2. Disconnect a fuel injector.
  3. 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.
  4. Remove the INJECTORS IGN MOD fuse.
  5. Measure the resistance between the INJECTORS IGN MOD 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.
  6. Connect the J 44603  into each fuel injector connector one at a time. Crank the engine.
    • If the test lamp flashes for each injector, perform the Fuel Injector Diagnosis. Refer to Fuel Injector Diagnosis (w/J39021 or w/Tech 2)  or Fuel Injector Diagnosis (w/CH47976) .
    • 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). If the circuit tests normal, replace the control module.
    • 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. If the circuit tests normal, replace the control module.
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