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.

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 P073 reset?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
CHECK THE (G31) AAT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Disconnect the AAT Sensor harness connector.
2. Measure the voltage of the (G31) AAT Signal circuit at the AAT Sensor harness connector.
  NOTE:
  The voltage should read approximately 5.0 Volts with connector disconnected and key on.
  
  Is the voltage above 5.2 Volts?
  
  Yes
  - Repair the (G31) Ambient Air Temperature Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK THE (G31) AAT SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Disconnect the DDM harness connector.
2. Measure the resistance of the (G31) AAT Signal circuit between the AAT Sensor harness connector and the DDM harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (G31) Ambient Air Temperature Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
CHECK THE (C160) DRIVER MIRROR HEATER RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
2. Measure the resistance of the (C160) Driver Mirror Heater Return circuit between the ECT Sensor harness connector and the PCM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Ambient Air Temperature Sensor in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
  No
  - Repair the (C160) Driver Mirror Heater Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .