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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 Pump Electrical Circuit Diagnosis >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, remove the circuit opening relay.
  2. Ignition ON, verify that a test lamp illuminates between the relay coil ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the coil ignition circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the relay switch B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate, test the relay switch ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the EFI fuse is open, test the relay controlled output circuit terminal 3 for a short to ground. If the circuit tests normal, test or replace the relay.
  4. Connect a 30A fused jumper between the relay switch B+ circuit terminal 5 and the relay controlled output circuit terminal 3. Verify the fuel pump turns ON.
    • If the pump is OFF, test the relay controlled output circuit for an open/high resistance. If the circuit tests normal, test the fuel pump ground circuit for an open/high resistance. If the circuit tests normal, replace the fuel pump.
  5. Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal 2 and ground.
    • If the test lamp illuminates, test the coil control circuit for a short to voltage. If the circuit tests normal, replace the PCM.
  6. Command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not illuminate, test the relay coil control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM.
  7. If all circuits test normal, test or replace the circuit opening relay.
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