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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the generator.
  2. Verify that a test lamp illuminates between the B+ circuit ring terminal 1 X2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter is less than 5 percent.
    • If greater than the specified range, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the ECM.
      • Terminal 2 X1 (L61/LE5)
      • Terminal C X1 (LNF)
  4. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. Verify the scan tool ECM GEN-F Terminal Signal parameter is greater than 95 percent.
    • Terminal 2 X1 (L61/LE5)
    • Terminal C X1 (LNF)
    • If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the generator.
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