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Home › Saturn › 2008 › Vue Red Line, AWD › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 3.6L - DTC P1174 To DTC P2635 › DTC P1682 › Circuit/System Testing

Circuit/System Testing

IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Testing the Ignition 1 Signal Circuit

    IMPORTANT: A resistance of 5 ohms or greater in the circuit will cause the DTC to set.
  1. Ignition ON, verify that B+ is available to both test points of the fuse from the run/crank relay to the ECM.
    • If B+ is only available on one test point of the fuse, test the ignition 1 voltage circuit from the fuse to the ECM for a short to ground. If the circuit tests normal, replace the ECM.
    • If B+ is not available on either test point of the fuse, replace the underhood fuse block.
  2. Ignition OFF, disconnect the ECM X1 connector.
  3. Ignition ON, verify that B+ is available at X1-19.
    • If B+ is not available, test the ignition 1 voltage circuit for an open/high resistance condition. If the circuit tests normal, replace the ECM.
  4. If all circuits test normal, replace the ECM.

Testing the EC Ignition Relay Feedback Circuit

    IMPORTANT: A resistance of 5 ohms or greater in the circuit will cause the DTC to set.
  1. Ignition OFF, remove the powertrain relay, which is main relay 6, from the underhood fuse block.
  2. Ignition ON, connect a 3A fused jumper wire from B+ to the powertrain relay ignition 1 voltage circuit terminal 87. Verify that the EC Ignition Relay Feedback parameter displays B+ on the scan tool.
    • If the scan tool parameter is less than the specified value, test the ignition 1 voltage circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
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