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
1. Turn the ignition on 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 INTERMITTENT CONDITION - 6.7L .
CHECK THE DEF TANK LEVEL SENSOR
1. Ignition on, engine not running.
2. Disconnect the DEF Tank Level/Temperature Sensor harness connector.
3. With the scan tool check DTCs.
4. Monitor the scan tool for one minute.
  Did DTC P203D set as active after disconnecting the sensor?
  
  Yes
  - Replace the DEF Tank Level/Temperature Sensor in accordance with the service information. Refer to SENSOR, Diesel Exhaust Fluid Level/Temperature , Removal .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3.
CHECK THE (K414) DEF TANK LEVEL SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking DEF Tank Level Sensor Signal Circuit For A Short To Ground
Courtesy of CHRYSLER LLC
1. Turn ignition off.
2. Disconnect the DEF Dosing Control Unit C1 harness connector.
3. Measure the resistance between ground and the (K414) DEF Tank Level Sensor Signal circuit at the DEF Tank Level/Temperature Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the (K414) DEF Tank Level Sensor Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (K414) DEF TANK LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO THE (K420) DEF TANK LEVEL SENSOR RETURN CIRCUIT

Fig 2: Checking DEF Tank Level Sensor Signal Circuit For A Short
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K414) DEF Tank Level Sensor Signal circuit and the (K420) DEF Tank Level Sensor Return circuit at the DEF Tank Level/Temperature harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - 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 POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the short between the (K414) DEF Tank Level Sensor Signal circuit and the (K420) DEF Tank Level Sensor Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .