Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 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.
2. 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 STANDARD PROCEDURE .
CHECK THE SCR RELAY 1
1. With the scan tool, Erase DTCs.
2. Turn the ignition off.
3. Replace the SCR Relay 1 with a known good relay.
4. Turn the ignition on.
5. With the scan tool, navigate to Actuator Tests and actuate the DEF Line Heater or Tank Heater Override Test.
6. Turn the ignition off for 5.0 seconds.
7. Turn the ignition on.
8. With the scan tool, View DTCs.
  Did the DTC return?
  
  Yes
  - Go To 3
  No
  - Repair complete.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .
CHECK FOR THE (K401) SCR RELAY 1 SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT
1. Stop actuation.
2. Turn the ignition off.
3. Remove the SCR Relay 1.
4. Disconnect the DEF Dosing Control Unit C2 harness connector.
5. Measure the resistance between the (F203) SCR Module Heater Supply circuit and all other circuits in the DEF Dosing Control Unit C2 harness connector.
  Is the resistance above 10k Ohms between the (F203) SCR Module Heater Supply circuit and all other circuits?
  
  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 STANDARD PROCEDURE .
  No
  - Repair the (F203) SCR Module Heater Supply circuit for a short to the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to STANDARD PROCEDURE .