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:
Diagnose any CAN C Bus Communication DTCs before continuing.
1. Turn the ignition one.
2. With the scan tool, select View DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT DTC diagnostic procedure. Refer to STANDARD PROCEDURE .
CHECK THE (G31) AAT SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Ambient Air Temperature Sensor (AAT) harness connector.
3. Disconnect the BCM C4 harness connector.
4. Measure the resistance between ground and the (G31) AAT Signal circuit in the AAT Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (G31) AAT Signal circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR THE (G31) AAT SIGNAL CIRCUIT SHORTED TO THE (G931) SENSOR GROUND CIRCUIT
1. Measure the resistance between the (G31) AAT Signal circuit and the (G931) Sensor Ground circuit at the AAT Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the short between the (G31) AAT Signal circuit and the (G931) Sensor Ground circuit.
  - Perform the PCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE AAT SENSOR
1. Reconnect the BCM C4 harness connector.
2. Turn the ignition on, engine not running.
3. With a scan tool, select View DTCs.
  NOTE:
  The scan tool should display the P0073-AMBIENT AIR TEMPERATURE SENSOR CIRCUIT HIGH DTC as active or pending with the AAT Sensor harness connector unplugged.
  
  Does the scan tool display the DTC as described above?
  
  Yes
  - Verify that there is good pin to terminal contact in the AAT Sensor and Totally Integrated Power Module (TIPM) connectors. If ok, replace the Ambient Air Temperature Sensor.
  - Perform the PCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
BODY CONTROL MODULE (BCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the AAT Sensor and the Body Control Module (BCM).
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 Body Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Body Control Module (BCM) in accordance with the service information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .