1992–1996 Jaguar XJS Car Service Manual (P/N S-79)

• Covers 1992–1993 XJS Coupe and Convertible models equipped with the 4.0L AJ6 engine, the 5.3L V12 engine, and ZF 4-speed automatic or 5-speed manual transmissions
• Official Jaguar publication: 1992 Technical Introduction and 1993 Model Year Update (Publication S-79), delivered as a searchable over 100-page PDF
• Contains 40 detailed wiring diagrams, extensive fuse identification tables, and exploded-view component illustrations
• Highlights the driver's side air bag, convertible X-bracing, On-Board Diagnostics (OBD), Sumitomo connectors, and Multilock terminals
• Details the digital ignition, ABS ECU, cruise control, evaporative emission control, and 19K security system

System Coverage Overview

This service documentation delivers precise technical specifications for the 1992–1993 model year updates. Content details exterior body styling revisions, including the redesigned trunk lid, improved door mirror assemblies, and updated Coupe glazing systems. Inside the cabin, sections cover the restyled sports seats with memory functions, center console configurations, and the revised trip computer display within the instrument pack.

Mechanical chapters focus heavily on the 4.0L AJ6 engine and the 5.3L V12 engine. You will find complete reference material for the intake system, fuel delivery components, and refined cooling arrangements. Additional sections break down electronics and climate control. This includes interface details for the JDS (Jaguar Diagnostic System), the 19K security system, and exact locations for electronic management units. For drivetrains, the manual details the ZF 4HP 24E automatic gearbox and five-speed manual unit, mapping out specific interlock mechanisms alongside control module functions. Wiring data spans engine management, transmission control, and color-coded connector specs for the updated harnesses.

To provide a distinct workshop advantage, the text eliminates dealership reliance by outlining step-by-step procedures for coding new RF key fob transmitters, manually overriding the gear shift interlock, extracting trip computer units, and replacing headlight bulbs. Beyond standard wiring schematics, the documentation provides relay identification charts, ECU location views, system layout drawings, and component panel location drawings to streamline any repair or troubleshooting task.

Specifications and Diagnostic Data

The engine management section outlines fuel delivery and secondary emission controls. Fuel rail pressure is regulated at 36 psi at idle, scaling up to 44 psi under load. Cylinder head bolt torque values are documented at 27 Nm for anchor bracket bolts. The 1993 AJ6 engine produces 219 hp at 4750 rpm, while battery cold cranking amperage specifies 43 amps.

When performing maintenance or a complex fix on these models, technicians should be aware of a few specific repair pitfalls. On Convertible models, never lift the vehicle using the structural X-bracing as a jacking point; doing so will instantly bend the stainless steel tubing and compromise torsional rigidity. Furthermore, if the AJ6 engine experiences idle issues, be mindful that the Engine Control Module's adaptive idle fueling will completely fail to initialize unless specific diagnostic trouble codes (DTCs) are successfully cleared first. Please ensure standard workshop safety protocols, including proper battery disconnection, are strictly followed before accessing electrical harnesses or high-pressure fuel systems.