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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 705 (Engine Controls And Fuel - 2.2L (L61) - 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. Ignition OFF, disconnect the harness connector at a fuel injector.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A 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.
  3. Ignition OFF, connect a J 44603  between the control circuit terminal B and the ignition circuit terminal A of each fuel injector, one at a time. See Special Tools .
  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. If all circuits test normal, test or replace the fuel injector. Refer to Fuel Injector Diagnosis (w/J39021 or w/Tech 2)  or Fuel Injector Diagnosis (w/CH47976) .
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