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Home >> Pontiac >> 2009 >> G6 GXP, 2D Coupe >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0335 To DTC P0496 >> DTC P1682 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the powertrain relay, which is PWR/TRN relay 33.
  2. Ignition ON, verify that a test lamp does not illuminate between the powertrain relay controlled output circuit terminal 30 and ground.
    • If the test lamp illuminates, test the powertrain relay controlled output circuit for a short to voltage.
  3. Ignition OFF, verify that a test lamp illuminates between the powertrain relay coil voltage supply circuit terminal 86 and ground.
    • If the test lamp does not illuminate, test the powertrain relay coil voltage supply circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the powertrain relay switch voltage supply circuit 87 terminal and ground.
    • If the test lamp does not illuminate, test the powertrain relay switch voltage supply circuit for an open/high resistance.
  5. Disconnect the X1 harness connector at the ECM.
  6. Ignition ON, verify that a test lamp illuminates between ECM connector terminal 19 X1 and ground.
    • If the test lamp does not illuminate, test the RUN/CRANK relay controlled output circuit for a short to ground or open/high resistance. If the circuit tests normal and its fuse is open, replace the ECM.
  7. Ignition OFF, connect the harness connector at the ECM.
  8. Ignition ON, connect a jumper wire between the powertrain relay switch voltage supply circuit terminal 87 and the powertrain relay controlled output circuit terminal 30. Verify the EC Ignition Relay Feedback Signal parameter indicates battery positive voltage.
    • If not the specified value, test the powertrain relay controlled output circuit for a short to ground or an open/high resistance. If the circuit tests normal and its fuse is open, replace the ECM.
  9. If all circuits test normal, replace the powertrain relay.
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