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
1. Turn the ignition on, engine not running.
2. With the scan tool, navigate to Systems Tests and actuate the Diesel Exhaust Fluid Doser Pump Override Test.
3. With the scan tool, View DTCs.
  Is the DTC Active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (K421) DEF SUPPLY PUMP MOTOR A SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Turn the 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 between ground and the DEF Supply Pump Motor A Supply circuit at the DEF Supply Pump Assembly harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the DEF Supply Pump Motor A Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K470) DEF SUPPLY PUMP MOTOR B SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the DEF Supply Pump Motor B Supply circuit at the DEF Supply Pump Assembly harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the DEF Supply Pump Motor B Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K434) DEF SUPPLY PUMP MOTOR C SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the DEF Supply Pump Motor C Supply circuit at the DEF Supply Pump Assembly harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the DEF Supply Pump Motor C Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE DEF DOSING CONTROL UNIT
1. Re-connect the DEF Dosing Control Unit C2 harness connector.
2. Leave the DEF Supply Pump Assembly harness connector disconnected.
3. Turn the ignition on.
4. With a scan tool, View DTCs.
  Did DTC P208A become active and DTC P208C change to stored?
  
  Yes
  - Replace the DEF Supply Pump Assembly in accordance with the service information. Refer to ASSEMBLY, DIESEL EXHAUST FLUID PUMP, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the DEF Dosing Control Unit in accordance with the service information. Note: The DEF Dosing Control Unit is located on the DEF Tank. Refer to UNIT, DIESEL EXHAUST FLUID DOSING CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .