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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1660 (5.7L - DTCS P000B To P0175 - 2500 Hd) >> DTC Troubleshooting >> P0073-Ambient Air Temperature Sensor Circuit High (With DDM) >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Diagnose any CAN C Bus Communication DTCs before continuing.

    1. Turn the ignition one.
    2. With the scan tool, read DTCs.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (G31) AAT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Ambient Air Temperature Sensor (AAT) harness connector.
    3. Turn the ignition on, engine not running.
    4. Measure the voltage on the (G31) AAT Signal circuit at the AAT Sensor harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      No 

      • Go To  3
  3. CHECK THE (G31) AAT SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the DDM C2 harness connector.
    3. Measure the resistance of the (G31) AAT Signal circuit between the AAT Sensor harness connector and the DDM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (G31) AAT Signal circuit for an open or high resistance.
      • Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK THE (C160) HEATED MIRROR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (C160) Heated Mirror Return circuit between the AAT Sensor harness connector and the DDM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (C160) Heated Mirror Return circuit for an open or high resistance.
      • Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. REPLACE THE AMBIENT AIR TEMPERATURE SENSOR AND RETEST FOR DTC 
    1. Turn the ignition off.
    2. Replace the Ambient Air Temperature Sensor in accordance with the Service Information.
    3. Turn the ignition on.
    4. With the scan tool, read DTCs and record on the repair order.

      Is the DTC still reporting active or pending?

      Yes 

      • Go To  6

      No 

      • Replacing the Ambient Air Temperature Sensor repaired the fault.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. DRIVERS DOOR MODULE (DDM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the AAT Sensor and the Drivers Door Module (DDM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the AAT Sensor and Drivers Door Module connectors.
    4. Perform any Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

      • Replace the Drivers Door Module (DDM) in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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