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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System & Fuel System - 1.8L (Lay) - Troubleshooting & Diagnosis) >> Fuel Injector Circuit Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    IMPORTANT:
    • Perform this test for each fuel injector.
    • If a cylinder specific misfire DTC was set, test the fuel injector of misfiring cylinder first.
  1. Ignition OFF, disconnect the harness connector at the appropriate fuel injector.
  2. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance. Replace the fuse if necessary.
  3. Ignition OFF, connect a J 34730-2B  between the control circuit terminal 2 and the ignition 1 voltage circuit terminal 1. See Special Tools .
  4. Engine cranking or running, the injector test lamp should flash.
    • If the test lamp is always ON, test the control circuit for a short to ground. If circuit tests normal, replace the PCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the PCM.
  5. If all circuits test normal, test or replace the fuel injector.
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