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Isuzu 4ja1 User Manual

Isuzu 4ja1
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WORKSHOP MANUAL
2011MY TF SERIES
ENGINE
4JA1/4JH1 MODELS
SECTION 6
Isuzu Motors Limited
E-Solutions &
Service Marketing Dept.

Table of Contents

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Isuzu 4ja1 Specifications

General IconGeneral
Fuel TypeDiesel
Cylinder ConfigurationInline-4
Fuel SystemIndirect Injection
AspirationNaturally Aspirated
Compression Ratio21.5:1
Cooling SystemWater-cooled
Engine TypeDiesel
Displacement2.5 L (2499 cc)
Bore x Stroke93 mm x 92 mm
Maximum Torque176 Nm (130 lb-ft) at 2000 rpm
ValvetrainOverhead Valve (OHV)

Summary

Troubleshooting Section 6

Basic Inspection Procedure

Follow the under inspection procedure when the problem vehicle comes workshop.

1. Hard Starting

Inspect the following items before diagnosis: The battery conditions, terminal connection, charge condition.

3. Insufficient Power

Check air cleaner element, intake air leakage, fuel filter, fuel injection pipes, water content, and compression.

6. Overheating

Check engine coolant level, water leakage, fan belt, thermostat, water pump, and cooling system restrictions.

15. Starter Motor Problem

Diagnose starter motor issues: pinion engagement, incorrect engagement, continued running, commutator sparking.

Engine Mechanical

Main Data and Specifications

Provides key engine specifications for 4JA1T(L) and 4JA1TC models.

Torque Specification

Lists standard bolt torque values and flare nut torque specifications.

Disassembly

Details the steps for disassembling major engine components.

Reassembly

Details the steps for reassembling minor internal engine components.

Engine Cooling

Main Data and Specifications

Provides cooling system specifications for M/T and A/T configurations.

Diagnosis

Lists common engine cooling troubles, possible causes, and actions.

Draining and Refilling Cooling System

Procedure for draining and refilling the cooling system with coolant.

Fuel System

Main Data and Specifications

Provides specifications for fuel system components across different engine models.

Fuel Filter and Water Separator

Describes the function and components of the fuel filter and water separator.

Injection Pump

Describes the Bosch distributor type and VP44 injection pumps.

Engine Electrical

Main Data and Specifications

Provides specifications for generator and starter motor types.

Generator

Details the removal and installation procedures for the generator.

Starter Motor

Details the removal and installation procedures for the starter motor.

Engine Control System (4JH1)

Specifications

Provides temperature vs. resistance and altitude vs. barometric pressure data.

Schematic And Routing Diagrams

Illustrates vacuum hose routing diagrams for normal and high altitude specs.

Diagnostic Information And Procedures

Provides a systematic approach to diagnosing engine control system concerns.

Diagnostic System Check - Engine Controls

The starting point for diagnosing any driveability concern.

Exhaust System

Main Data and Specifications

Provides specifications for exhaust system components.

EGR System Diagram

Illustrates the EGR system operation and inspection for 4JA1T(L).

Turbocharger

Details main data and specifications for turbocharger models.

Accelerator Control

Removal and Installation

Provides procedures for removing and installing accelerator control systems.

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