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 (K414) DEF TANK LEVEL SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking DEF Tank Level Sensor Signal Circuit For A Short To Voltage
Courtesy of CHRYSLER LLC
1. Turn ignition off.
2. Disconnect the DEF Tank Level/Temperature Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (K414) DEF Tank Level Sensor Signal circuit at the DEF Tank Level/Temperature Sensor harness connector.
  Does the voltage measure above 5.1 Volts?
  
  Yes
  - Repair the (K414) DEF Tank Level Sensor Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3.
FUEL LEVEL SENSOR
1. Turn the ignition off.
2. Connect a jumper 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.
3. Turn the ignition on, engine not running.
4. With the scan tool check for DTCs.
5. Monitor the scan tool for one minute.
  Did DTC P203C set as active after shorting the circuits together?
  
  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 4.
CHECK THE (K414) DEF TANK LEVEL SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 2: Checking DEF Tank Level Sensor Signal Circuit For An Open/High Resistance
Courtesy of CHRYSLER LLC
1. Turn ignition off.
2. Disconnect the DEF Dosing Control Unit C1 harness connector.
3. Measure the resistance of the (K414) DEF Tank Level Sensor Signal circuit between the DEF Tank Level/Temperature Sensor harness connector and the Diesel Exhaust Fluid Control Unit C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the (K414) DEF Tank Level 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 (K420) DEF TANK LEVEL SENSOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 3: Checking DEF Tank Level Sensor Return Circuit For An Open/High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K420) DEF Tank Level Sensor Return circuit between the DEF Tank Level/Temperature Sensor harness connector and the DEF Dosing Control Unit C1 harness connector.
  Is the resistance below 5.0 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 (K420) DEF Tank Level Sensor Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .