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Diagnostic Test

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  1. EXHAUST LEAK 
    NOTE:

    A thorough exhaust leak test must be completed before removing an O2 Sensor or any other part from the exhaust system. Do not remove any parts before an exhaust leak check has been completed.

    NOTE:

    An exhaust leak may cause downstream fuel adaptives to rail out, resulting in a false O2 Sensor failure

    1. Perform the diagnostic procedure for CHECKING THE EXHAUST SYSTEM FOR LEAKS. Refer to DIAGNOSIS AND TESTING .

      Were any problems found?

      Yes 

      • Go To  7

      No 

      • Go To  2
  2. DTC IS ACTIVE 
    1. Diagnose and repair any other active component or circuit DTCs before continuing with this procedure.
    2. Turn the ignition on.
    3. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information.
    4. Start the engine and allow it to reach operating temperature.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

      NOTE:

      Attempt to operate the vehicle under conditions similar to which the DTC was set.

      NOTE:

      It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set.

    5. With a scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go To  3

      No 

  3. CHECKING THE FUEL DELIVERY SYSTEM 
    1. Perform the diagnostic procedures for FUEL PRESSURE LEAK DOWN and FUEL DELIVERY SYSTEM OUTPUT - FLOW TEST. Refer to DIAGNOSIS AND TESTING .

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECKING THE OXYGEN SENSOR OPERATION 
    1. Perform the diagnostic procedure for CHECKING THE OXYGEN SENSOR OPERATION. Refer to DIAGNOSIS AND TESTING .

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECKING THE ENGINE MECHANICAL SYSTEM 
    1. Perform the diagnostic procedure for CHECKING THE ENGINE MECHANICAL SYSTEM. Refer to DIAGNOSIS AND TESTING .

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to the components tested in this procedure.
      • Look for any chafed, pierced, pinched, or partially broken wires.
      • Look for broken, bent, pushed out or corroded terminals.
      • Monitor the scan tool data relative to the components tested in this procedure and wiggle test the wiring and connectors.
      • Look for the data to change or for a DTC to set during the wiggle test.
      • Perform any technical service bulletins that may apply.

      Were any problems found?

      Yes 

      No 

  7. EXHAUST LEAK 
    1. Repair the exhaust leak(s) as necessary.
    2. Start the engine and allow it to reach operating temperature.
    3. Test drive the vehicle at a steady 80 kph (50 mph) to 97 kph (60 mph) for at least 10 minutes.
    4. Stop the vehicle and turn the ignition off for 5 seconds.
    5. Test drive the vehicle again at a steady 80 kph (50 mph) to 97 kph (60 mph) for at least 10 minutes.
    6. Stop the vehicle.
    7. With the scan tool, select View DTCs.

      Does this DTC reset as a pending or stored DTC?

      Yes 

      • Retest. Go To  1

      No 

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