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 DTC P204A is present, perform the diagnosis for that DTC before continuing with this one.
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. Refer to INTERMITTENT CONDITION .
CHECK THE (K433) DEF LEVEL SENSOR 5-VOLT SUPPLY CIRCUIT
1. Turn ignition off.
2. Disconnect the DEF Supply Pump Assembly harness connector.
3. Turn ignition on.
4. Measure the voltage at the (K433) DEF Level Sensor 5-Volt Supply circuit at the DEF Supply Pump Assembly harness connector.
  Is the voltage reading between 4.8 and 5.2 volts?
  
  Yes
  - Go To 3
  No
  - Repair the (K433) DEF Level Sensor 5-Volt Supply circuit for an open circuit or short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K433) DEF LEVEL SENSOR 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Turn ignition off.
2. Disconnect the DEF Dosing Control Unit C2 harness connector.
3. Check for continuity between ground and the (K433) DEF Level Sensor 5-Volt Supply circuit at the DEF Supply Pump Assembly harness connector.
  Is there continuity between ground and the (K433) DEF Level Sensor 5-Volt Supply circuit?
  
  Yes
  - Go To 4
  No
  - Repair the (K433) DEF Level Sensor 5-Volt Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K414) DEF LEVEL SIGNAL CIRCUIT FOR A SHORT TO THE (K431) DEF LEVEL SENSOR GROUND CIRCUIT
1. Check for continuity between the (K414) DEF Level Signal circuit and the (K431) DEF Level Sensor Ground circuit at the DEF Supply Pump Assembly harness connector.
  Is there continuity between the (K414) DEF Level Signal circuit and the (K431) DEF Level Sensor Ground circuit?
  
  Yes
  - Go To 5.
  No
  - Repair the short between the (K414) DEF Level Signal circuit and the (K431) DEF Level Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K414) DEF LEVEL SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K414) DEF Level Signal circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (K414) DEF Level Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE DEF SUPPLY PUMP ASSEMBLY FOR PROPER OPERATION
1. Turn ignition off.
2. Connect a jumper between the (K433) DEF Level Sensor 5-Volt Supply circuit and the (K414) DEF Level Signal circuit at the DEF Supply Pump Assembly harness connector.
3. Reconnect the DEF Dosing Control Unit C2 harness connector.
4. Turn the ignition on, engine not running.
5. With the scan tool check DTCs.
6. Monitor the scan tool for one minute.
  Did DTC P203D 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. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the DEF Dosing Control Unit in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .