Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If there are any Ambient Temperature Sensor DTCs present, perform the Diagnostics for those DTCs before continuing with this one.
1. Ignition on, engine not running.
2. With the scan tool check for active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK FOR HIGH RESISTANCE IN THE DEF TANK TEMPERATURE SENSOR SIGNAL CIRCUIT
1. Turn ignition off.
2. Disconnect the DEF Supply Pump Assembly harness connector.
3. Disconnect the DEF Dosing Control Unit C2 harness connector.
4. Measure the resistance of the DEF Tank Temperature Sensor Signal circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the DEF Tank Temperature Sensor Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK FOR HIGH RESISTANCE IN THE DEF TANK TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the DEF Tank Temperature Sensor Return circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the DEF Tank Temperature Sensor Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE DEF TANK TEMPERATURE SENSOR
1. Reconnect the DEF Dosing Control Unit C2 harness connector.
2. Connect a jumper between the DEF Tank Temperature Sensor Signal circuit and the DEF Tank Temperature Sensor Return circuit at the DEF Supply Pump Assembly harness connector.
  NOTE:
  Be careful not to spread the terminals in the connector.
3. Turn the ignition on.
4. Monitor the scan tool for one minute.
5. Remove the jumper and continue to monitor the scan tool one minute after removing.
  Did the scan tool display P205C active with the jumper in place and P205D with the jumper removed?
  
  Yes
  - Replace the DEF Supply Pump Assembly in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the DEF Dosing Control Unit in accordance with the service information. Refer to UNIT, DIESEL EXHAUST FLUID DOSING CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .