Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If there are any 5-Volt supply DTCs present, repair those DTCs before proceeding with this test.
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE DEF AMBIENT AIR TEMPERATURE SENSOR
1. With the scan tool, erase DTCs.
2. Turn the ignition off.
3. Disconnect the DEF Ambient Air Temperature Sensor harness connector.
4. Turn the ignition on and wait 30 seconds while monitoring the scan tool.
5. Use a jumper and connect the DEF Ambient Air Temperature Sensor Signal circuit to the DEF Ambient Air Temperature Sensor Ground circuit at the DEF Ambient Air Temperature Sensor harness connector and monitor the scan tool for 30 seconds.
  Did the P00DC-DEF AMBIENT AIR TEMPERATURE SENSOR HIGH set with the sensor disconnected and the P00DB-DEF AMBIENT AIR TEMPERATURE SENSOR LOW set with the jumper in place?
  
  Yes
  - Replace the DEF Ambient Air Temperature Sensor in accordance with the service information. Refer to SENSOR, Diesel Exhaust Fluid Ambient Temperature , Removal .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3.
CHECK THE (G32) DEF AMBIENT AIR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 1: Checking DEF Ambient Air Temperature Sensor Signal Circuit For An Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance of the (G32) DEF Ambient Air Temperature Sensor Signal circuit between the DEF Ambient Air Temperature Sensor harness connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the (G32) DEF Ambient Air Temperature Sensor Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K900) DEF AMBIENT AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 2: Checking DEF Ambient Air Temperature Sensor Ground Circuit For An Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K900) DEF Ambient Air Temperature Sensor Ground circuit between the DEF Ambient Air Temperature Sensor harness connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Powertrain Control Module in accordance with the service information. Refer to MODULE, Powertrain Control, 6.7L Diesel [ETJ] , Removal .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the (K900) DEF Ambient Air Temperature Sensor Ground circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .