This TSB involves the 2008 Jaguar XF 4.2L Supercharged model only. The engine malfunction indicator lamp may be illuminated with “Restricted Performance” displayed in the message center and DTCs P0171 and P0174 may be stored in the ECM. This may be caused by one or more leaks in the engine air intake system.
PARTS: AJ86892 side gaskets
TOOLS: IDS with latest software, Midtronics PSC-550 Vehicle Power Supply and VACUTEC 522-B EVAP Tester 218-00015 or equivalent EVAP tester with built-in nitrogen generator.
NOTE: The diagnostic procedure must begin with a cold engine.
INSPECT FOR INTAKE AIR LEAKS/MONITOR LONG-TERM AND SHORT-TERM FUEL TRIMS
1. Use Special Tool 218-00015 (VACUTEC 522-B EVAP Tester) or equivalent to smoke test the following for five minutes each:
* Down the oil level indicator tube
* In the part-load breather
2. If any leaks are found, repair as necessary.
3. Repeat step 1 to verify.
CAUTION: A Midtronics PSC-550 vehicle power supply must be connected to the vehicle battery during diagnosis.
4, If no leaks are found, connect the Midtronics PSC-550 to the vehicle battery. Note: IDS must be loaded with the latest software.
5. Connect the IDS to the vehicle and begin a new diagnostic session by entering the correct VIN for the current vehicle.
6. Follow the IDS prompts to read the vehicle configuration.
7. Select “No” when prompted “Do you wish to read diagnostic trouble codes?”
8. Select “tick” to continue.
9. Start the engine.
10. Using the IDS Datalogger function, monitor long-term and short-term fuel trims until the engine is fully warmed-up. NOTE: Long-term and short-term fuel trims should remain below 10%.
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11. Use the EVAP tester to smoke test the following for five minutes each:
* Down the oil level indicator tube
* In the part-load breather
12. Verify that all engine intake air cleaner outlet pipe/hose connections are secure (Figure 1).
13. If long-term and short-term fuel trims remain below 10% and no leaks are found during the smoke test, print out the Fuel Trim Adaptation report, and contact the Jaguar Technical Help Line.
14. If any leaks are found, repair as necessary.
15. Repeat step 11 to verify the repair.
16. If long-term and short-term fuel trims are above 10%, refer to Workshop manual (GTR) section 303-12E to replace the supercharger outlet pipe gaskets, P/N AJ86892 (Figure 2).
17. Remove the Midtronics PSC-550 from the vehicle battery.
18, Using the IDS datalogger function on a cold engine, monitor long-term and short-term fuel trims during a road test until the engine is fully warmed up. Long-term and short-term fuel trims should remain below 10% under all conditions except during wide-open-throttle application.
19. If fuel trims remain above 10% (except under WOT), and supercharger outlet pipe gaskets have been replaced, print out a Fuel Trim Adaption report and contact the Jaguar Technical Help Line.
CLEAR POWERTRAIN CONTROL MODULE ADAPTIONS
1. Connect the Midtronics PSC-550 to the vehicle battery.
2. Select the “Vehicle Configuration” tab when Content Model is displayed.
3. From the Vehicle Configuration menu, clear the Powertrain Control Module adaptions by selecting from the drop-down menu:
4. Special applications > Powertrain > Powertrain control module adaption clear
5. Select “tick” to continue, following all on-screen instructions to complete this task. IDS will return to the Vehicle Configuration menu when completed.
6. Exit the current session.
7. Disconnect IDS and the Midtronics PSC-550 from the vehicle.
