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DTC P0072: Ambient Temp Sensor Low: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read the AAT sensor voltage. Is the voltage below 0.3 of a volt? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the AAT sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, read AAT sensor voltage. Is the voltage above 1.0 volt? If yes, replace the AAT sensor. If no, go to next step.
  3. Turn the ignition off. Disconnect the AAT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K25) AAT signal circuit in the AAT sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K25) AAT signal circuit. If no, go to next step.
  4. Turn the ignition off. Disconnect the AAT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the (K25) AAT signal circuit and the (K4) sensor ground circuit in the AAT sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K4) sensor ground shorted to the (K25) AAT signal circuit. If no, go to next step.
    5. NOTE: Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  5. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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