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DTC P0073: Ambient Temp Sensor High: Testing

  1. Turn ignition on, engine not running. With the DRBIII(R), read the Ambient Air Temperature Sensor voltage. If the voltage is above 4.9 volts, go to next step. If the voltage is not above 4.9 volts, see INTERMITTENT CONDITIONS  . Perform POWERTRAIN VERIFICATION TEST VER-5  .
  2. Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Turn the ignition on, engine not running. Measure the voltage of the (K145) AAT Signal circuit in the Ambient Air Temperature Sensor harness connector. If the voltage is above 5.2 volts, repair the short to battery voltage in the (K145) AAT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER-5  . If the voltage is not above 5.2 volts, go to next step.
  3. Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Connect a jumper wire between the (K145) AAT Signal circuit and the (K167) Sensor ground circuit in the Ambient Air Temperature Sensor harness connector. Turn the ignition on, engine not running. With the DRBIII(R), read Ambient Air Temperature Sensor voltage. If the voltage is below 1.0 volt, replace the Ambient Air Temperature Sensor. Perform POWERTRAIN VERIFICATION TEST VER-5  . If the voltage is not below 1.0 volt, go to next step.
    4. CAUTION: DO NOT probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  4. Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Disconnect the PCM harness connector. Measure the resistance of the (K145) AAT Signal circuit from the Ambient Air Temperature Sensor harness connector to the appropriate terminal of Miller Special Tool (8815). If the resistance is below 5.0 ohms, go to next step. If the resistance is not below 5.0 ohms, repair the open in the (K145) AAT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER-5  .
    5. CAUTION: DO NOT probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  5. Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Disconnect the PCM harness connector. Measure the resistance of the (K167) Sensor ground circuit from the Ambient Air Temperature Sensor harness connector to the appropriate terminal of Miller Special Tool (8815). If the resistance is below 5.0 ohms, go to next step. If the resistance is not below 5.0 ohms, repair the open in the (K167) Sensor ground circuit. Perform POWERTRAIN VERIFICATION TEST VER-5  .
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  6. If there are no possible causes remaining, replace and program the Powertrain Control Module. See PROGRAMMING  . Check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
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