Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 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.

NOTE:
If there are any other DTC's related to the Engine Coolant Temperature (ECT) sensor, Charge Air Temperature sensor, or Intake Manifold Temperature Sensor present in the PCM, perform the Diagnostics for those DTCs before continuing with this one.
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 INTERMITTENT CONDITION - 6.7L .
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 POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3
CHECK THE (G31) AAT SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the Driver Door Module (DDM) C2 harness connector.
3. Measure the resistance of the (G31) AAT Signal circuit between the Ambient Air Temperature 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 POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
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 Ambient Air Temperature Sensor harness connector and the DDM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (C160) Heated Mirror Return for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (G31) AAT SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. 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 6
  No
  - Repair the (G31) AAT Signal circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (G31) AAT SIGNAL CIRCUIT SHORTED TO THE (C160) HEATED MIRROR RETURN CIRCUIT
1. Measure the resistance between the (G31) AAT Signal circuit and the (C160) Heated Mirror Return circuit at the AAT Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the short between the (G31) AAT Signal circuit and the (C160) Heated Mirror Return circuit.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
AMBIENT AIR TEMPERATURE SENSOR
1. Turn the ignition off.
2. Replace the Ambient Air Temperature Sensor in accordance with the Service Information. Refer to SENSOR, AMBIENT TEMPERATURE, REMOVAL .
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  Is the DTC still reporting active or pending?
  
  Yes
  - Go To 8
  No
  - Repair is complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
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 BODY VERIFICATION TEST .
  No
  - Replace the Drivers Door Module (DDM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .