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Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN 
    1. Using the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, using the scan tool, run and save a Vehicle Scan Report and all recorded data.
    3. With the scan tool, erase all DTCs.
    4. Perform several ignition cycles leaving the ignition on for at least 10 seconds then off for 10 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle under the conditions that set the DTC.
    7. Using the scan tool, read DTCs.

    Did the DTC return as Active or Pending?

    Yes 

    • Go To  2

    No 

    • Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
  2. CHECK FOR OTHER DTCS 
    1. Ignition on, engine not running.
    2. With the scan tool, read DTCs.
    3. Save the Vehicle Scan Report and all recorded data.

      Are there any other Aftertreatment, Fuel Injection Control System, Turbocharger, or Intake Air System DTCs present?

      Yes 

      • Perform the Diagnostics for any other DTCs present before continuing with this one.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. INSPECT THE EXHAUST SYSTEM FOR LEAKS AT THE CONNECTIONS BETWEEN THE TURBOCHARGER AND THE EXHAUST MANIFOLD 
    1. Inspect the Exhaust System for leaks at the connections between the Turbocharger and the Exhaust Manifold. Perform the CHECKING THE EXHAUST SYSTEM FOR LEAKS diagnostic procedure. Refer to CHECKING THE EXHAUST SYSTEM FOR LEAKS .

      Were any exhaust leaks found at the connections between the Turbocharger and the Exhaust Manifold?

      Yes 

      • Repair the Exhaust System leak found at the connections between the Turbocharger and the Exhaust Manifold.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE RATIONALITY OF THE EGT SENSORS 
    NOTE:

    This Test Step is a cold-soak rationality procedure. The test requires that the engine be turned off for at least 8 hours.

    1. Allow the engine to cool off for at least 8 hours.
    2. Turn the ignition on, engine off.
    3. Using the scan tool, select the four EGT Sensor values: EGT 1/1 ('Turbine Temp'), EGT 1/2 ('Outlet Pre-Cat'), EGT Catalyst ('Inlet DPF'), and EGT 1/3 ('Upstream SCR').
    4. Compare the EGT 1/1 to the other three selected.

      Is the EGT 1/1 Sensor reading within 6°C (11°F) of the other three sensors?

      Yes 

      • Go To  5

      No 

      • Replace the Exhaust Gas Temperature (EGT) 1/1 Sensor in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  5. CHECK THE FUEL QUALITY/CONTAMINATION 
    1. Perform the Diesel Fuel System Contamination procedure. Refer to DEF FLUID-DIRT-METAL-OR-OTHER FOREIGN DEBRIS .

      Were any problems found?

      Yes 

      • Repair as needed according to the Diesel Fuel Cleanup portion of the Contamination test procedure.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Connect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

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