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:
If the P204A DTC is also active, diagnose and repair that DTC before continuing with this test procedure.
1. Start the engine and allow it to idle for one minute, 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 - 6.7L. Refer to STANDARD PROCEDURE .
CHECK THE DEF TANK LEVEL SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn ignition off.
2. Disconnect the DEF Supply Pump Assembly harness connector.
3. Turn the ignition on.
4. Measure the voltage on the DEF Tank Level Sensor Signal circuit at the DEF Supply Pump Assembly harness connector.
  Does the voltage measure above 5.2 Volts?
  
  Yes
  - Repair the DEF Tank Level Sensor Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK FOR THE DEF TANK LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO THE DEF TANK LEVEL SENSOR 5-VOLT SUPPLY CIRCUIT
1. Turn ignition off.
2. Disconnect the DEF Dosing Control Unit C2 harness connector.
3. Measure the resistance between the DEF Tank Level Sensor Signal circuit and the DEF Tank Level Sensor 5-Volt Supply circuit at the DEF Supply Pump Assembly harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the DEF Tank Level Sensor Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
CHECK THE DEF TANK LEVEL SENSOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the DEF Tank Level 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 5
  No
  - Repair the DEF Tank Level Sensor Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
FUEL LEVEL SENSOR
1. Connect a jumper between the DEF Tank Level Sensor Signal circuit and the DEF Tank Level Sensor Return circuit at the DEF Supply Pump Assembly harness connector.
2. Turn the ignition on, engine not running.
3. With the scan tool check for DTCs.
4. Monitor the scan tool for one minute.
  Did DTC P203C set as active or pending with the jumper in place?
  
  Yes
  - Replace the DEF Supply Pump Assembly in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
  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 - 6.7L. Refer to STANDARD PROCEDURE .