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Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any ECT Sensor, EGR, Injector, FRP Sensor, Turbocharger, MAF/Intake Air Sensor, O2 Sensor, or Misfire DTCs active or pending?

      Yes 

      No 

      • Go To  2
  2. CHECK THE AIR FILTER FOR EXCESSIVE AIR FLOW RESTRICTION 
    1. Turn the ignition off.
    2. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction

      Were any of these problems found?

      Yes 

      No 

      • Go To  3
  3. CHECK THE AIR INTAKE SYSTEM AND EXHAUST SYSTEMS FOR FLOW RESTRICTIONS 
    NOTE:

    Inspect all air intake, crankcase vent and turbocharger related tubes for damage, restriction or poor connection. Any of these conditions can cause this DTC to set.

    NOTE:

    Inspect the exhaust system and related tubes for damage, restriction or poor connection. Any of these conditions can cause this DTC to set.

    1. Inspect the intake system, exhaust system and related tubes and connections.

      Were any intake system, exhaust system problems found?

      Yes 

      No 

      • Go To  4
  4. CHECK THE INTAKE AIR SYSTEM AND EXHAUST SYSTEM FOR LEAKS 
    1. Perform the INTAKE AIR SYSTEM LEAK DETECTION test procedure. Refer to INTAKE AIR SYSTEM LEAK DETECTION .

      Is there evidence of a leak?

      Yes 

      No 

      • Go To  5
  5. CHECK THE ECT SENSOR FOR PROPER OPERATION 
    NOTE:

    For this test to be valid, the thermostat must be operating correctly.

    NOTE:

    This test works best if performed on a cold engine (cold soak)

    1. Ignition on, engine not running.
    2. With the scan tool, read the Engine Coolant Temperature (ECT) Sensor value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature.
      NOTE:

      If engine coolant temperature is above 82°C (180°F), allow the engine to cool until 65°C (150°F) is reached.

    3. Start the Engine.
    4. During engine warm-up, monitor the ECT Sensor value. The temperature value change should be a smooth transition from start up to normal operating temperature 88°C (190°F).

      Did the ECT value increase smoothly and did it reach at least 88°C (190°F)?

      Yes 

      • Go To  6

      No 

      • Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. Replace the ECT Sensor if no problems were found with the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  6. CHECK THE EGR SYSTEM FOR A LEAK OR RESTRICTION 
    1. Check for visible signs (soot streaks) of external EGR system leaks around the V-band clamps and connections. Ensure that all torques are within specifications.

      Were any EGR system leaks found?

      Yes 

      • Repair as necessary in accordance with the Service Information to the EGR system.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK THE O2 SENSOR CIRCUIT 
    1. Disconnect the O2 Sensor harness connector
    2. Check the Fused ASD Relay (F343) output circuit for an open/high resistance.
    3. Check the O2 1/1 (K41) Signal circuit for an open/high resistance.
    4. Check the O2 1/1 (K902) Return circuit for an open/high resistance.
    5. Check the O2 1/1 Positive Current (K89) Control circuit for an open/high resistance.
    6. Check the O2 1/1 Heater (K79) Control circuit for an open/high resistance.

      Are there any issues with the wiring for the O2 Sensor?

      Yes 

      No 

      • Go To  8
  8. CHECK THE FUEL DELIVERY SYSTEM FOR PROPER OPERATION 
    1. Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to CHECKING THE FUEL DELIVERY SYSTEM .

      Were any problems found with the fuel system?

      Yes 

      No 

      • Go To  9
  9. CHECK THE ENGINE FOR MECHANICAL PROBLEMS 
    1. Turn the ignition off.
    2. Check for any of the following conditions/mechanical problems:
      • AIR INDUCTION SYSTEM - must be free from leaks.
      • ENGINE VALVE TIMING - must be within specifications
      • ENGINE COMPRESSION - must be within specifications
      • ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
      • ENGINE PCV SYSTEM - must flow freely
      • TORQUE CONVERTER STALL SPEED - must be within specifications
      • FUEL - must be free of contamination
      • FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector

      Are there any engine mechanical problems?

      Yes 

      No 

      • Go To  10
  10. 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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