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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P0685, P0689, P0690, or P1682 (LUW) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing unless sent here from Engine Cranks But Does Not Run.

  1. Ignition OFF, disconnect the KR75 Engine Controls Ignition Relay.
  2. Verify that a test lamp illuminates between ground and the relay circuit terminals listed below:
    • Terminal 85
    • Terminal 30
      • If the test lamp does not illuminate, test the relay battery voltage circuit for an/high resistance.
        NOTE:

        High resistance in the circuit/underhood fuse block either the engine controls ignition relay or the ignition main relay can cause DTC P1682 to set.

  3. Ignition ON, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 87 and ground.
    • If the test lamp illuminates, test the ignition voltage circuit for a short to voltage.
  4. Connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 30 and the relay switch ignition voltage circuit terminal 87.
  5. Ignition ON, observe the scan tool Engine Controls Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should display B+.
    • If not the specified value, or the ECM does not communicate, test the ignition voltage circuit between the engine controls ignition relay and the ECM for a short to ground or for an open/high resistance. If the circuit/connections test normal, replace the K20 Engine Control Module.
  6. Ignition OFF, connect a DMM set to the diode setting between control circuit terminal 86 and ground. Verify the DMM displays OL.
    • If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
  7. Ignition ON, verify the DMM displays less than 1 V.
    • If not the specified range, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  8. If all circuits test normal, replace the KR75 Engine Controls Ignition Relay.
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