General: Diagnosis Jaguar S-type I рестайлинг

Functional Test

On completion of a maintenance procedure, a thorough test should be carried out, to make sure that the relevant vehicle systems are working correctly.

Inspection

Before inspecting a component for wear or performing a dimensional check, make sure that it is absolutely clean; a slight smear of grease can conceal an incipient failure. When a component is to be checked dimensionally against figures quoted for it, use the correct equipment (surface plates, micrometers, dial gauges etc.) in serviceable condition. The use of makeshift equipment can be dangerous. Reject a component if its dimensions are outside the limits quoted, or if damage is apparent. A part may be refitted if its critical dimension is exactly to the limit size and it is otherwise satisfactory. Use Plastigauge 12 Type PG-1 for checking bearing surface clearance, e.g. big end bearing shell to crank journal. Instructions for the use of Plastigauge and a scale giving bearing clearances in steps of 0,0025 mm (0.0001 in) are supplied with the package.

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 system or the more restricted scan tools.

The OBD information in this article 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 system.

The article covers the following OBD topics

1. General Information
2. Engine Management System
3. Automatic Transmission
4. Anti-lock Braking System

Each section comprises one or more of the following sub-sections as required.

The Description and Operation sub-information includes

1. A general illustration and parts list to help the identification of the particular system or component.
2. A brief description of the system operating characteristics and monitoring procedure accompanied by a component illustration.
3. Additional information, where appropriate, is provided in the form of component calibrations, characteristics and cross sectional views.
4. A localized circuit diagram is included to provide circuit identification, connectors, splices, fuses, wire gauge and colors. See «Circuit Diagrams»(ref-311255-S17675796192009032500000) .

The Diagnosis and Testing is dedicated to fault analysis and rectification, and includes

1. Recommended special tools.
2. Symptom chart; a chart containing all relevant Diagnostic Trouble Codes (DTC), their possible causes and an indication of the appropriate test.
3. Specific pinpoint test(s), designed so that fault diagnosis can be carried out in a logical and efficient manner.

The Removal and Installation covers

1. Removal procedure(s), formatted in the recommended sequence.
2. Illustrated guide to the use of special tools.
3. Illustrations to support the relevant text.
4. Installation procedure as above and including special recommendations for processes, lubricants and tightening torques.

High Pressure Air, Lubrication and Oil Test Equipment

See also Lubricants and Greases .

Always keep high pressure equipment in good condition, and regularly maintained, particularly at joints and unions.

Never direct a high pressure nozzle, e.g. diesel injector, at the skin as the fluid may penetrate to the under - lying tissue etc., and cause serious injury.

On Road or Roller Test Check

1. Clutch pedal operation is not stiff or heavy.
2. Initial gear engagement is smooth and there is no evidence of clutch drag.
3. Handbrake control operates smoothly and the handbrake releases quickly and completely.
4. Clutch takes up the drive smoothly, without slip or judder.
5. The engine power output is satisfactory, full power is achieved, acceleration is smooth and pedal operation not stiff or heavy, and engine speed returns to idle correctly.
6. There is no excessive or abnormally colored smoke from the engine under normal driving, heavy load or overrun conditions.
7. Steering operation, including power steering where fitted, is smooth, accurate, not excessively heavy or with excessive free play or vibration. Does not pull to one side and self centers smoothly after cornering.
8. Speedometer, oil pressure warning lamp, coolant temperature gauge and tachometer (where fitted) register the correct readings or operate correctly.
9. Switches and controls operate smoothly and positively, warning or indicator lights operate correctly and the direction indicator control self cancels when the steering is returned to the straight ahead position.
10. Heating and ventilation systems work correctly and effectively.
11. Brake operation and efficiency.

Brake Testing

Avoid brake testing on busy roads where it can cause inconvenience or danger to other road users.

Test the brakes at several speeds within the normal operating range using both light and heavy pedal pressure. Note any tendency to snatch, pull or drag, and any undue delay in application or release.

Allow the vehicle to coast and note any tendency to pull to one side, or evidence that the brakes are binding.

After stopping the vehicle (not immediately after a period of heavy braking), carefully check the brake temperature. A disc which feels hot, or appreciably hotter than the others, indicates that the brake is binding.

After completion of the test, check for

1. Oil, coolant, hydraulic, air and fuel leaks.
2. Abnormal temperature of any moving components or assemblies, e.g. wheel hubs, transmission, axle etc., which might indicate overtightness or lack of lubrication.