Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJAGUAR1991XJ-6 L6-4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINS
1991 Jaguar XJ-6 L6-4.0L
Computers and Control Systems: Technical Service Bulletins
1991 Jaguar XJ-6 L6-4.0LSECTION Technical Service Bulletins
- Customer Interest
- By Symptom
- All Technical Service Bulletins
- PDU Software - Now Compatible With JTP 627/3
- PDU - Software 1000 Error Requesting Start Engine
- PDU - Software Updates
- PDU - Software Update
- PDU - New Software Update
- Engine - Poor Running in Wet or Hot Weather Conditions
- ECU - Unnecessary Replacement
- JDS - Software Changes
- JDS - Adaptor Kit
- Tool - Fuel Injection Tester
- ECU - Unnecessary Replacement Due to DTC 29
- DTC 44 - Diagnosing Oxygen Sensor
- EMS - Code 89 Purge Valve Circuit Diagram Correction
- Check Engine Light - Reporting and Erasing DTCs
- Engine - Momentary Power Loss or Stalling
- Engine Controls - Removal of Seized Oxygen (O2) Sensors
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.