2003 Jeep Wrangler SUV Service Manual
2003 Jeep Wrangler SE, X, Sport, Sahara, Rubicon systems including ignition, fuel control, and onboard diagnostics. Publication part # 81-699-97094.
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Models Covered & Key Technical Specifications
Practical Installation Operator's Manual: Jeep Wrangler repair manual, 2003 edition Repository
| Equipment-Series: Jeep Wrangler 2003 // Product-Line: TJ // Equipment-Series: SUV Repository | Identifier | Rating | Context |
|---|---|---|---|
| Engine Control Module (PCM) | Monitors and controls | fuel system, ignition system, charging system, speed control system, automatic transmission | |
| Driveability Diagnostics | Based on failure condition or symptom | failure condition or symptom being present at the time of diagnosis | |
| DRBIII Diagnostic Tool | Used for testing | reading DTCs, monitoring parameters, and performing tests | |
| On-Board Diagnostics | OBDII/EUROIII compliant | Controls functions to meet emission requirements | |
| Diagnostic Procedures | Step-by-step instructions | Determining cause of trouble codes and no trouble code problems | |
| Six-Step Trouble Shooting Procedure | Basic steps | verification of complaint, symptom analysis, problem isolation, repair, verification of operation |
Inspection guidelines are provided for diagnosing PCM Powertrain System issues. Alignment specifications are included for ensuring proper component function. Reference data is included for various systems. This manual covers diagnostic procedures and system operation. Diagnostic procedures are covered for all components and related systems.
Professional Workshop Service Manual & Technical Specifications
Jeep Wrangler 2003 Repair Manual: Vehicle Systems and Diagnostics Repository
Equipment-Series: Jeep Wrangler 2003 // Product-Line: TJ // Equipment-Series: SUV Repository
TABLE OF CONTENTS
1.0 INTRODUCTION 1.1 SYSTEM COVERAGE 1.2 SIX-STEP TROUBLE SHOOTING PROCEDURE 2.0 IDENTIFICATION OF SYSTEM 3.0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION 3.1 GENERAL DESCRIPTION 3.2 FUNCTION OPERATION 3.2.1 FUEL CONTROL (GAS) 3.2.2 ON-BOARD DIAGNOSTICS 3.2.3 OTHER CONTROLS 3.2.4 NON-MONITORED CIRCUITS 3.2.5 SKIS OVERVIEW 3.2.6 SKIM ON-BOARD DIAGNOSTICS 3.2.7 SKIS OPERATION 3.2.8 PROGRAMMING THE POWERTRAIN CONTROL MODULE 3.2.9 PROGRAMMING THE SENTRY KEY IMMOBILIZER MODULE 3.2.10 PROGRAMMING THE IGNITION KEYS TO THE SENTRY KEY IMMOBILIZER MODULE 3.3 DIAGNOSTIC TROUBLE CODES 3.3.1 HARD CODE 3.3.2 INTERMITTENT CODE 3.3.3 STARTS SINCE SET COUNTER 3.3.4 NO START INFORMATION 3.4 USING THE DRBIII 3.5 DRBIII ERROR MESSAGES AND BLANK SCREEN 3.5.1 DRBIII DOES NOT POWER UP 3.5.2 DISPLAY IS NOT VISIBLE 4.0 DISCLAIMERS, SAFETY, WARNINGS 4.1 DISCLAIMERS 4.2 SAFETY 4.2.1 TECHNICIAN SAFETY INFORMATION 4.2.2 VEHICLE PREPARATION FOR TESTING 4.2.3 SERVICING SUB-ASSEMBLIES 4.2.4 DRBIII SAFETY INFORMATION 4.3 WARNINGS AND CAUTIONS 4.3.1 ROAD TEST WARNINGS 4.3.2 VEHICLE DAMAGE CAUTIONS 5.0 REQUIRED TOOLS AND EQUIPMENT 6.0 ACRONYMS 7.0 DIAGNOSTIC INFORMATION AND PROCEDURES
Thoroughly requiring diagnostic procedures for the 2003 Jeep Wrangler, this manual details system operations, component locations, and diagnostic trouble codes. It includes step-by-step testing procedures to help technicians diagnose and repair issues efficiently. The content is organized for clarity, covering various systems from fuel control to ignition and emissions.
Engine Control Module (PCM) Operation
This section details the Powertrain Control Module's role in monitoring and controlling various vehicle systems. It outlines the on-board diagnostics, including OBDII/EUROIII compliance, and the criteria for setting trouble codes. The PCM compares input signal voltages with established limits to identify malfunctions.
Diagnostic Trouble Codes (DTCs) and Intermittent Issues
The manual provides specific testing procedures for each diagnostic trouble code, including "hard codes" and "intermittent codes." It emphasizes visual inspection of wiring harnesses and connectors, as well as the use of diagnostic tools like the DRBIII for accurate problem identification.
Sentry Key Immobilizer System (SKIS)
Information on the SKIS is provided, explaining its function in preventing unauthorized vehicle operation. Procedures for programming the powertrain control module and ignition keys are included, along with notes on potential lockout modes and the importance of country code selection.
This manual documents torque specifications for various components to ensure proper assembly security. It also covers procedures for system checks and troubleshooting common issues.
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