Win7

FOR SERVICE TRAINING

4JH1-TC ENGINE
Engine Management System Operation & Diagnosis

Applicable Model Model Year 2001 2002 2003 Vehicle Model N*R 77 N*R 77 N*R 77 Emission Regulation Euro 3 Euro 3 Euro 3 / EPA 94

ISUZU MOTORS LIMITED

CONTENTS
INTRODUCTION & OUTLINE
GENERAL INFORMATION ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -------------- ----- ----- ----- ----- ----- ----- ----- ----- --------- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- --------- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- --------- ----- ----- ----- ----- ----- ----- ----- ----- --------- ----- ----- ----- ----- ----CHARACTERISTIC OF VP44 INJECTION PUMP ENGINE CONTROL MODULE BREAKER BOX Page 1 1 2 3 45 10 15 16 19

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SPS (SERVICE PROGRAMMING SYSTEM)

DATA EXCHANGE BETWEEN CONTROL MODULE

PRINCIPLE OF FUEL QUANTITY METERING & INJECTION TIMING

ECM WIRING SCHEME

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ECM CONNECTOR PIN ASSIGNMENT PSG CONNECTOR PIN ASSIGNMENT

ELECTRICAL COMPONENTS
MASS AIR FLOW (MAF) SENSOR & INTAKE AIR TEMPERATURE (IAT) SENSOR

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20 24 26 29 31 33 36

ENGINE COOLANT TEMPERATURE (ECT) SENSOR-------------------------------------------------CRANKSHAFT POSITION (CKP) SENSOR -----------------------------------------------------------PEDAL/THROTTLE POSITION SENSOR (TPS) VEHICLE SPEED SENSOR (VSS)

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EGR (EXHAUST GAS RE-CIRCULATION) QUICK ON SYSTEM 2 (QOS 2)STRATEGY BASED DIAGNOSTIC

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-----------------------------------------------------------------------------------------------------------------------------------------------DIAGNOSTIC THOUGHT PROCESS ---------------------------------------------------------------------OVERVIEW

STRATEGY BASED DIAGNOSTIC CHART

38 38 39DIAGNOSIS WITH TECH 2 -------------------------------------------------------------------------------------------------------------------------------------------------------------------TECH 2 CONNECTION ------------------------------------------------------------------------------------TECH 2 OPERATING FLOW CHART (START UP) ------------------------------------------------------IF CODES ARE SETIF NO CODES ARE SET 47 47 47 48 50

TYPICAL SCAN DATA & DEFINITIONS SNAPSHOT ANALYSIS

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SNAPSHOT DISPLAY WITH TIS2000 ----------------------------------------------------------------------

53 56

DIAGNOSTIC TROUBLE CODE

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SYMPTOM DIAGNOSIS-------------------------------------------------------------------------------VISUAL/PHYSICAL CHECK -------------------------------------------------------------------------------INTERMITTENT ------------------------------------------------------------------------------------FAULTY SYMPTOM & DEFINITION ---------------------------------------------------------------------ECM CIRCUIT DIAGRAM------------------------------------------------------------------------------------WITH ABS (2/2) ------------------------------------------------------------------------------------WITHOUT ABS (1/2) ------------------------------------------------------------------------------------WITHOUT ABS (2/2) ------------------------------------------------------------------------------------PARTS LOCATION (LHD)...