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DTC P0073: Ambient Temp Sensor Circuit High: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition on, engine not running. With the DRBIII®, read the ambient temperature sensor voltage. If the voltage is above 4.8 volts, go to next step. If the voltage is not above 4.8 volts, see INTERMITTENT CONDITION (NGC)  under SYSTEM TESTS. Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  under VERIFICATION TESTS.
  2. Turn the ignition off. Disconnect the ambient temperature sensor harness connector. Connect a jumper wire between the (G31) AAT sensor signal circuit and the (K4) sensor ground circuit in the AAT sensor harness connector. Turn ignition on, engine not running. With the DRBIII®, read ambient temperature sensor voltage. If the voltage is below one volt, replace the ambient temperature sensor. Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  under VERIFICATION TESTS. If the voltage is not below one volt, go to next step.
    3. NOTE: Remove jumper wire before continuing.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Turn the ignition on, engine not running. Measure the voltage on the (G31) AAT sensor signal circuit in the AAT sensor harness connector. If the voltage is above 5.2 volts, repair the short to voltage in the (G31) AAT sensor signal circuit. Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  under VERIFICATION TESTS. If the voltage is not above 5.2 volts, 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. Measure the resistance of the (G31) AAT sensor signal circuit from the AAT sensor harness connector to the appropriate terminal of the Miller Special Tool (8815). If the resistance is below 5 ohms, go to next step. If the resistance is not below 5 ohms, repair the open in the (G31) AAT sensor signal circuit. Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  under VERIFICATION TESTS.
    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. Measure the resistance of the (K4) sensor ground circuit from the AAT sensor harness connector to the appropriate terminal of Miller Special Tool (8815). If the resistance is below 5 ohms, go to next step. If the resistance is not below 5 ohms, repair the open in the (K4) sensor ground circuit. Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  under VERIFICATION TESTS.
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or pushed out terminals. Repair as necessary.
  6. Using the schematics 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 . Perform POWERTRAIN VERIFICATION TEST VER-5 (NGC)  under VERIFICATION TESTS.
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