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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B34A engine coolant temperature sensor.
  2. Inspect the B34A Engine Coolant Temperature Sensor terminals for corrosion and for engine coolant leaking through the sensor.
  3. Ignition OFF and all vehicle systems OFF. It may take may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal 2 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 engine control module.
  4. Service Mode active, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F).
    • If warmer than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 engine control module.
    5. NOTE: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool ECT Sensor parameter is warmer than 130°C (266°F).
    • If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  6. If all circuits test normal, test or replace the B34A engine coolant temperature sensor.
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