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Home >> Saturn >> 2008 >> Vue Red Line, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.6L - DTC P025A To DTC P0700 >> DTC P0685 or P0690 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the powertrain relay, which is main relay 6.
  2. Ignition ON, verify that a test lamp illuminates between the powertrain relay coil B+ terminal 85 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 terminal 85 and the control circuit terminal 86.
    • 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 terminal 85 and 86 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 X1-40 for an open/high resistance.
    • If the circuit tests normal, replace the ECM.
  9. Verify that a test lamp does not illuminate between the relay ignition 1 voltage circuit terminal 87 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 relay switch B+ terminal 30 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 20 A fused jumper wire between the relay switch B+ terminal 30 and the relay ignition 1 voltage circuit terminal 87.
  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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