Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, erase DTCs in the PCM.
3. Start the engine and allow the engine to reach normal operating temperature.
4. Monitor the scan tool for at least two minutes.
5. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK THE (K404) DEF LINE HEATER SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the DEF Line Heater harness connector.
3. Disconnect the HCU harness connector.
4. Measure the resistance between ground and the (K404) DEF Line Heater Supply circuit at the DEF Line Heater harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (K404) DEF Line Heater Supply circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
DEF LINE HEATER ASSEMBLY
1. Replace the DEF Line Heater Assembly in accordance with the service information.
2. Reconnect the DEF Line Heater harness connector.
3. Reconnect the HCU harness connector.
4. Ignition on, engine not running.
5. With the scan tool, erase DTCs in the PCM.
6. Start the engine.
7. Allow the engine to reach normal operating temperature.
8. Monitor the scan tool for at least two minutes.
9. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Replace the Heater Control Unit (HCU) in accordance with the service information.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Test Complete.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .