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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ECT sensor.
  2. Ignition ON, clear the DTC information with a scan tool.
  3. Ignition ON, verify that the scan tool ECT sensor parameter is at -40°C (-40°F).
    • If greater than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Test for less than 0.5 volt between the low reference circuit and ground.
    • If greater than specified value, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  6. Ignition ON, clear the DTC information with a scan tool.
    7. IMPORTANT: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.
  7. Install a 1A fused jumper wire between the signal circuit and the low reference circuit. Verify the ECT sensor parameter is greater than 128°C (262°F).
    • If less than specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the ECM.
  8. If all circuits test normal, test or replace the ECT sensor.
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