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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 151 (Engine Controls And Fuel - 3.4L - DTC P0401 To DTC P2544) >> DTC P0685, P0689, or P0690 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the powertrain relay, which is PWR/TRN relay 47.
  2. Ignition ON, verify that a test lamp illuminates between the powertrain relay coil B+ and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the battery positive cable to the underhood fuse block.
  3. Ignition OFF, verify that a test lamp does not illuminate between the powertrain relay coil B+ circuit and the control circuit.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Remove the test lamp.
  5. Command the powertrain relay ON with a scan tool. Verify with a scan tool that the powertrain relay Ckt. Short Volts Test Status parameter is OK.
    • If not the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Test the coil side of the powertrain relay for 65-110 ohms.
    • If not within the specified value, replace the relay.
  7. Ignition OFF, disconnect the ECM X1 connector.
  8. Test the powertrain relay control circuit X1-59 for an open/high resistance.
    • If the circuit tests normal, replace the ECM.
  9. Verify that a test lamp does not illuminate between the powertrain relay ignition 1 voltage circuit and ground.
    • If the test lamp illuminates, test the relay ignition 1 voltage circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  10. Verify that a test lamp illuminates between the powertrain relay switch B+ and ground.
    • If the test lamp does not illuminate, test the relay switch B+ circuit for a short to ground or an open/high resistance. If the circuits test normal, and the fuse for the ignition 1 voltage circuit is open, test the ignition 1 voltage circuit to the ECM for a short to ground. If the circuit tests normal, replace the ECM.
  11. Connect a 20A fused jumper wire between the powertrain relay switch B+ and the powertrain relay ignition 1 voltage circuit.
  12. Connect the ECM. Ignition ON, engine OFF, monitor the EC Ignition Relay Feedback parameter with a scan tool. The parameter should display B+.
    • If the parameter does not display B+, test the ignition 1 voltage circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  13. If all circuits test normal, replace the relay.
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