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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ambient air temperature sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Ignition ON, verify the scan tool Ambient Air Temp. Sensor parameter is greater than 4.7 volts.
    • If less than 4.7 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3-amp fused jumper wire between the signal circuit and ground. Verify the scan tool Ambient Air Temp. Sensor parameter is less than 0.4 volt.
    • If greater than 0.4 volt, test the signal circuit for an open/high resistance. If the circuit tests normal replace the BCM.
  5. If all circuits test normal, test or replace the ambient temperature sensor.
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