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Circuit/System Testing

NOTE:

All electrical components and accessories must be turned OFF and allowed to power down.

  1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.
  2. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 Ω between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, verify the scan tool ECT Sensor parameter is colder than -40°C (-40°F).
    • If warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT Sensor parameter is greater than 150°C (302°F).
    • If less than the specified range, test the signal circuit terminal B for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  5. If all circuits test normal, test or replace the B34 ECT sensor.
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