Description of On-Board Diagnostics

On-Board Diagnostics (OBD)

This vehicle uses programmed electronic control systems to provide engine management and emission regulation, automatic transmission operation and anti-lock braking control. These control systems are integral with the On-Board Diagnostics (OBD) facility which is used in conjunction with either the Jaguar approved diagnostic equipment or the more restricted scan tools.

The OBD information provides diagnostic and rectification procedures for emission related electrical and mechanical systems. The information is intended to facilitate fault diagnosis and the subsequent rectification of the vehicle without recourse to the Jaguar approved diagnostic equipment.

The information covers the following OBD topics:
- General Information
- Engine Management System
- Automatic Transmission
- Anti-lock Braking System

The Description and Operation information includes:
- A general illustration and parts list to help the identification of the particular system or component.
- A brief description of the system operating characteristics and monitoring procedure accompanied by a component illustration.
- Additional information, where appropriate, is provided in the form of component calibrations, characteristics and cross sectional views.
- A localized circuit diagram is included to provide circuit identification, connectors, splices, fuses, wire gauge and colors. See Circuit Diagrams.

The Diagnosis and Testing information is dedicated to fault analysis and rectification, and includes:
- Recommended special tools.
- Symptom chart; a chart containing all relevant Diagnostic Trouble Codes (DTC), their possible causes and an indication of the appropriate test.
- Specific pinpoint test(s), designed so that fault diagnosis can be carried out in a logical and efficient manner.

The Removal and Installation information covers:
- Removal procedure(s), formatted in the recommended sequence.
- Illustrated guide to the use of special tools.
- Illustrations to support the relevant text.
- Installation procedure as above and including special recommendations for processes, lubricants and tightening torques.

Circuit Diagrams
To understand the relationship between the vehicle electrical system and the system circuit diagrams, Refer to the Vehicle/Diagram.

In the interest of clarity, single lines may represent multiple wires. Refer to the color code (1st alpha) followed by the wire reference (numeric/alpha/numeric) to trace origin and destination.

e.g. BW 647B002. BW (black with white trace) 647 (wire reference) B002 (stage from origin).