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.
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 INTERMITTENT CONDITION - 6.7L .
CHECK THE DEF LINE HEATER RELAY
1. With the scan tool, Erase DTCs.
2. Turn the ignition off.
3. Replace the DEF Line Heater Relay with a known good relay.
4. Turn the ignition on.
5. With the scan tool, navigate to Actuator Tests and actuate the Line Heater Relay.
6. 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 POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (K475) DEF LINE HEATER RELAY SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT

Fig 1: Checking For DEF Line Heater Relay Signal Circuit For A Short
Courtesy of CHRYSLER LLC
1. Stop actuation of the Line Heater Relay.
2. Turn the ignition off.
3. Remove the DEF Line Heater Relay.
4. Disconnect the DEF Dosing Control Unit C2 harness connector.
5. Measure the resistance between the (K475) DEF Line Heater Relay Signal circuit and all other circuits in the DEF Dosing Control Unit C2 harness connector.
  Is the resistance above 10k Ohms between the (K475) DEF Line Heater Relay Signal circuit and all other circuits?
  
  Yes
  - Go To 4.
  No
  - Repair the (K475) DEF Line Heater Relay Signal circuit for a short to the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (K429) DEF LINE HEATER RELAY CONTROL CIRCUIT SHORTED TO ANOTHER CIRCUIT

Fig 2: Checking For DEF Line Heater Relay Control Circuit For A Short
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K429) DEF Line Heater Relay Control circuit and all other circuits in the DEF Dosing Control Unit C2 harness connector.
  Is the resistance above 10k Ohms between the (K429) DEF Line Heater Relay Control 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 POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the (K429) DEF Line Heater Relay Control circuit for a short to the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .