Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 2500 HD and 2012 RAM Pickup. 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 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 in the AAT Sensor harness connector.
  Is the voltage above 5.2 volts?
  
  Yes
  - Repair the (G31) AAT Signal circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 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 5.0 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 STANDARD PROCEDURE .
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 to the DDM C2 harness connector.
  Is the resistance below 5.0 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 STANDARD PROCEDURE .
AMBIENT AIR TEMPERATURE SENSOR
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.
  Is the DTC still reporting active or pending?
  
  Yes
  - Go To 6
  No
  - Repair is complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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 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 Drivers Door Module (DDM) in accordance with the service information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .