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Home >> Pontiac >> 2009 >> G3 Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Controls And Fuel - 1.6L (LDE, LLU, And LXV) Or 1.8L (2H0) - Troubleshooting And Diagnosis) >> Fuel Pump Electrical Circuit Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, the fuel pump should not be running.
    • If the fuel pump runs continuously, test the relay switch supply circuit terminal 87 for a short to voltage. If the circuit tests normal, replace the fuel pump relay.
  2. Ignition OFF, remove the fuel pump relay from the electrical center with the J 43244  .
  3. Verify a test lamp illuminates between the relay ground circuit terminal 85 and B+.
    • If the test lamp does not illuminate, repair the ground circuit for an open/high resistance.
  4. Ignition ON, test for 2-3 V between the control circuit terminal 86 and ground.
    • If less than the specified range, test the control circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. Command the fuel pump ON with a scan tool. The DMM should transition from 2-3 V when commanded OFF to greater than 10 V when commanded ON.
    • If the circuit voltage does not correspond to the specified values, replace the ECM.
  6. Verify a test lamp illuminates between the relay switch B+ voltage circuit terminal 30 and ground.
    • If the test lamp does not illuminate, repair the relay switch B+ voltage circuit for a short to ground or an open/high resistance.
  7. Install a 15 A fused jumper wire between the relay switch B+ voltage circuit terminal 30 and the relay switch supply circuit terminal 87. The fuel pump should turn ON.
    • If the fuel pump does not turn ON, test the relay switch supply circuit and the fuel pump motor ground circuit for an open/high resistance. If the circuits test normal, replace the fuel pump.
  8. If all circuits test normal, test or replace the fuel pump relay.
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