Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 75.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK THE DEF LINE HEATER (K404) SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the DEF Line Heater harness connector.
3. Turn the ignition on.
4. Measure the voltage on the DEF Line Heater (K404) Supply circuit at the DEF Line Heater harness connector.
  Is the voltage above 5.2 Volts?
  
  Yes
  - Repair the DEF Line Heater (K404) Supply circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE DEF LINE HEATER ASSEMBLY FOR PROPER OPERATION
1. Turn the ignition off.
2. Replace the DEF Line Heater Assembly in accordance with the Service Information.
3. Reconnect the DEF Line Heater 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 POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Replacing the DEF Line Heater Assembly repaired the fault.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .