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HOMESERVICE MANUALSCHRYSLER2004PT CRUISER TOURING, 2.4 B, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 19 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0072: AMBIENT TEMP SENSOR LOWTESTING
2004 Chrysler PT Cruiser Touring, 2.4 B, Automatic

DTC P0072: Ambient Temp Sensor Low: Testing

2004 Chrysler PT Cruiser Touring, 2.4 B, AutomaticSECTION Testing
WARNING: This page is about a different car, the 2004 Chrysler Intrepid, 2003 Dodge Intrepid, 2003 Chrysler Intrepid, 2003 Chrysler Concorde, and 2003 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
  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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.