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
NOTE:
Check the fluid level in the DEF Tank before proceeding with this test procedure.

NOTE: If there are any other DEF system DTCs present, perform the Diagnostics on those DTCs before continuing with this one.
1. Turn the ignition on.
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 - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K428) DEF INJECTOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Stop actuation of the Diesel Exhaust Fluid Doser Pump Override Test.
2. Turn the ignition off.
3. Disconnect the DEF Injector harness connector.
4. Disconnect the Dosing Control Unit (DCU) C1 harness connector.
5. Check for continuity between ground and the (K428) DEF Injector Signal circuit at the DEF Injector harness connector.
  Is there continuity between ground and the (K428) DEF Injector Signal circuit?
  
  Yes
  - Repair the (K428) DEF Injector Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3
CHECK THE (K428) DEF INJECTOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Check the reistance of the (K428) DEF Injector Signal circuit between the DEF Injector harness connector and the DCU C1 harness connector.
  Is the resistance less than 3.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (K428) DEF Injector Signal circuit for an open/high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K425) DEF INJECTOR RETURN CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K425) DEF Injector Return circuit at the DEF Injector harness connector.
  Is there continuity between ground and the (K425) DEF Injector Return circuit?
  
  Yes
  - Repair the (K425) DEF Injector Return circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
2. Go To 5
CHECK THE (K425) DEF INJECTOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Check the reistance of the (K425) DEF Injector Return circuit between the DEF Injector harness connector and the DCU C1 harness connector.
  Is the resistance less than 3.0 Ohms?
  
  Yes
  - Go To 6
  No
2. Repair the (K425) DEF Injector Return circuit for an open/high resistance.
3. Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE DEF SUPPLY LINE
1. Stop actuation of the Diesel Exhaust Fluid Doser Pump Override Test.
2. Turn the ignition off.
3. Disconnect the DEF Pressure Line.
4. Check the DEF Pressure Line for a restriction.
5. Inspect the DEF Supply Pump Assembly Outlet fitting and the DEF Injector connector and nozzle for signs of crystallization.
  Is the DEF Pressure Line, DEF Supply Pump Assembly outlet fitting, and DEF Injector free of obstructions?
  
  Yes
  - Replace the DEF Injector in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Clean the obstruction from the system or replace the blocked component if unable to clear obstruction.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .