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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 433 (6.7L Diesel - DTCS P0008 To P040D - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P0072- Ambient Air Temperature Sensor Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    There is no direct circuit input from the Ambient Air Temperature Sensor to the PCM.

    NOTE:

    If there are any Loss of Communication DTCs related to the DDM present in the Body Control Module or elsewhere, perform those diagnostics before continuing with this diagnostic tree.

    NOTE:

    If there are any other DTCs related to the Ambient Air Temperature Sensor present in the BCM, DDM, or any other module, perform those diagnostics before continuing with this diagnostic tree.

    1. Turn the ignition on.
    2. With the scan tool, record all Freeze frame data.
    3. With the scan tool, erase DTCs.
    4. Turn the ignition off for 75 seconds.
    5. Turn the ignition on.
    6. With the scan tool, read DTCs.

      Did DTC P072 reset?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (G31) AAT SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the AAT Sensor harness connector.
      NOTE:

      Check connectors - Clean/repair as necessary.

    3. Measure the resistance between ground and the (G31) AAT Signal circuit.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the (G31) AAT Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .

      No 

      • Go To  3
  3. CHECK FOR THE (G31) AAT SIGNAL CIRCUIT SHORTED TO THE (C160) DRIVER MIRROR HEATER RETURN CIRCUIT 
    1. Disconnect the Driver Door Module.
    2. Measure the resistance between the (G31) AAT Signal circuit and the (C160) Driver Mirror Heater Return circuit at the AAT Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short between the ((G31) AAT Signal circuit and the (C160) Driver Mirror Heater Return circuit.
      • Perform POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .

      No 

      • Replace the Ambient Air Temperature Sensor in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
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