JAGUAR ENGINE MANAGEMENT SYSTEMS: AJ16 OBD II; AJ6 OBD I ...

[Pages:360]JAGUAR SERVICE TRAINING

JAGUAR ENGINE MANAGEMENT SYSTEMS: AJ16 OBD II; AJ6 OBD I; V12 OBD I/II

SELF STUDY

SELF-STUDY TRAINING COURSE 801S

This publication is intended for instructional purposes only. Always refer to the appropriate Jaguar Service publication for specific details and procedures.

All rights reserved. All material contained herein is based on the latest information available at the time of publication. The right is reserved to make changes at any time without notice.

Publication T801S ? 2000 Jaguar Cars

PRINTED IN USA

Service Training

INTRODUCTION

Welcome to the Jaguar Engine Management Systems Self-Study Course. This course is intended to provide an overview of Jaguar Engine Management Systems prior to your attending the instructorled Jaguar Service Training Course: V6/V8 Engine Management. The contents of this self-study book also serve as your archival information for earlier Jaguar engine management systems.

This course and the accompanying test must be completed prior to attending the Jaguar Service Training Course: V6/V8 Engine Management unless you have already completed the instructor-led Service Training Course 801.

To complete this course: ? Thoroughly review the material in this manual, which is categorized by system version. ? Once you have invested adequate study time, review the Student Proficiency Test at the end of

this manual. ? Fill out the answer sheet, making sure you include your name, your Social Security number

and your Dealer Name. ? When complete, fax or mail your answer sheet to:

Jaguar Cars Service Training Department ATTN: Service Training Administrator 555 MacArthur Boulevard Mahwah, New Jersey 07430 FAX: (201) 818-9074

Thank you for your participation.

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JAGUAR ENGINE MANAGEMENT SYSTEMS: CONTROL FUNDAMENTALS

1 ENGINE MANAGEMENT SYSTEMS CONTROL OVERVIEW

2 JAGUAR ENGINE MANAGEMENT SYSTEMS

CONTROL FUNDAMENTALS

Service Training Course 801S

JAGUAR EMS: CONTROL FUNDAMENTALS

Service Training

ENGINE MANAGEMENT SYSTEM (EMS) CONTROL OVERVIEW

The primary purpose of engine management is to provide comprehensive engine control, which will produce a low level of vehicle powertrain emissions that meets clean air quality standards.

Powertrain emission sources: ? Engine exhaust emission ? Evaporative emissions from the fuel system and engine crankcase

In addition to emission control, the EMS must deliver: ? High quality engine operation ? Powertrain performance ? Vehicle drive quality

Clean air quality standards are interpreted into motor vehicle emission legislation that is known as On Board Diagnostics (OBD).

The first level OBD applied through vehicle model year 1994 and is known as OBD I. The second level OBD applied to vehicle model year 1995 and remains in effect today. This standard is known as OBD II. OBD standards are constantly evolving to produce a continuing reduction in vehicle powertrain emissions. As these standards evolve, engine management systems must become more comprehensive and more capable in order to meet the ever more stringent standards.

NOTES

1.2

Student Guide

JAGUAR EMS: CONTROL FUNDAMENTALS

Service Training

Engine Control Module (ECM)

The engine management system is centered around a digital engine control module (ECM). The ECM receives input signals from engine sensors to evaluate engine operating conditions. In addition, the ECM communicates with other powertrain systems and vehicle systems. The ECM then processes the sensor information and the information received from other systems using programmed software strategies and issues control output signals to the engine and emission control functional systems.

At its very basic level of control the ECM: ? takes engine speed and load input signals ? applies correction factor inputs and emissions control feedback signals ? processes the signals to access pre-programmed software strategies ? outputs control signals to the various engine and emission components.

During this process, the ECM employs diagnostic tests to monitor and report engine management system faults. Faults are stored in ECM memory as codes. Technician access to the fault codes and data is gained through a diagnostic data link.

BASIC ENGINE MANAGEMENT CONTROL

INPUTS

PROCESSING

OUTPUTS

ENGINE SPEED ENGINE LOAD ENGINE CORRECTION FACTORS EMISSIONS CONTROL FEEDBACK POWERTRAIN

VEHICLE

ECM

INPUT SIGNAL PROCESSING CONTROL OUTPUTS

DIAGNOSTIC MONITORING

FUEL INJECTION CONTROL IGNITION CONTROL EMISSION CONTROL DIAGNOSTIC DATA LINK

NOTES

TPTEC.115

Student Guide

1.3

JAGUAR EMS: CONTROL FUNDAMENTALS

Service Training

1.4

Student Guide

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