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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 639 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Outside Air Temperature Display Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  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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