Engine Pinging/Detonation - Check Long And Short Term Fuel Trim - Reprogram ECM (XJ303-04)

Publication date: 2004-12-01
Reference number: XJ303-04
Supersedes refnos: SECTION XJ303, NO. 04

ENGINE PINGING/DETONATION - CHECK LONG AND SHORT TERM FUEL TRIM - REPROGRAM ECM

TECHNICAL BULLETIN

Reference Number(s): XJ303-04, Date of Issue: 12/2004

JAGUAR:	2004 MY XJ
VIN:	G00421-G34527

Superceded Bulletin(s): XJ303-04, Date of Issue: 06/2004

NOTE: Remove and destroy Bulletin XJ303-04, dated 06/04.

Replace with this Bulletin.

The causal part no. and WDS software version have been updated.

Issue

Some 2004 MY XJ range vehicles within the above VIN range, may experience engine pinging or knocking.

Action

Should a customer experience engine detonation (pinging), check the long and short term fuel trim values using Worldwide Diagnostic System (WDS). If no faults are found, reconfigure the Engine Control Module (ECM). Follow the workshop procedure outlined below.

WORKSHOP PROCEDURE

Position WDS alongside vehicle, switch Portable Test Unit (PTU) 'ON' and allow software to load.
NOTE: Ensure WDS is loaded with software release JTP 759/35 or later.
Connect PTU to vehicle using diagnostic cable.
Enter VIN and navigate to DTC monitor.
Record all codes in the ECM and Transmission Control Module (TCM).
NOTE: Carry out any associated diagnostic routines and clear any fault codes. Any repairs are to be carried out as a separate Warranty Claim.
Navigate to datalogger.
Select 'park' and run engine to normal operating temperature.
Select and view signals for long term fuel trim (LTFT) bank 1 and bank 2, and short term fuel trim (STFT) bank 1 and bank 2.
NOTE: If a reading of greater than 7% is displayed, suspect a possible air leak or fuel starvation. Check intake ducting for security and leaks. Any repairs are to be carried out as a separate Warranty Claim, then continue from step 8. If a reading of less than 7% is displayed continue from step 8.
Navigate to configuration main menu.
Select and run 'reconfigure existing ECM' application.
After successful completion, switch 'OFF' PTU, disconnect from vehicle and return WDS to original location.

Global Technical Reference (GTR)

Dealer Access: https://hub.franchise.jaguar.com

Internet access: http://www.jaguartechinfo.com

Warranty Information:

Warranty claims should be submitted quoting the information found in the table below. This will result in payment of the stated time and, where applicable parts/miscellaneous expense codes as listed.

WARRANTY INFORMATION

Description	SRO	Time	Causal Part Number
Engine detonation service fix	86.93.40	0.6 hrs.	LNG 1410CD310

NOTE: THE INFORMATION IN TECHNICAL BULLETINS IS INTENDED FOR USE BY TRAINED, PROFESSIONAL TECHNICIANS WITH THE KNOWLEDGE, TOOLS AND EQUIPMENT TO DO THE JOB PROPERLY AND SAFELY. IT INFORMS THESE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR PROVIDES INFORMATION THAT COULD ASSIST IN PROPER VEHICLE SERVICE. THE PROCEDURES SHOULD NOT BE PERFORMED BY "DO-IT-YOURSELFERS." DO NOT ASSUME THAT A CONDITION DESCRIBED AFFECTS YOUR CAR. CONTACT A JAGUAR RETAILER TO DETERMINE WHETHER THE BULLETIN APPLIES TO YOUR VEHICLE.