Engine; Engine Control System; Table Of Contents - Isuzu 4HL1 Workshop Manual

Engine Control System . . . . . . . . . . . . . . . . . . . . 1A-2
Precautions on Service . . . . . . . . . . . . . . . . . . 1A-2
Function and Operation . . . . . . . . . . . . . . . . . . 1A-3
Powertrain System Components . . . . . . . . . . . 1A-9
Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . 1A-20
Strategy-Based Diagnostics . . . . . . . . . . . . . . 1A-38
Functional Check List . . . . . . . . . . . . . . . . . . . 1A-44
Hearing Diagnostic . . . . . . . . . . . . . . . . . . . . . 1A-44
On-Board Diagnostic (OBD) System Check . 1A-47
Inactive CHECK ENGINE Lamp Check . . . . . 1A-50
Unblinking CHECK ENGINE Lamp Check . . . 1A-54
ECM Power Supply and Grounding System Circuit
Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-56
Diagnosis with Tech 2 Scan Tool . . . . . . . . . . 1A-59
Diagnostic Chart . . . . . . . . . . . . . . . . . . . . . . . 1A-88
DTC14 - CMP Sensor System Fault . . . . . . . 1A-93
DTC15 - CKP Sensor System Fault . . . . . . . . 1A-97
DTC18 - Starter Degradation (For Only Vehicles
Equipped with Idle Stop Function) . . . . . . . . 1A-101
DTC22 - IAT Sensor System Fault . . . . . . . . 1A-103
DTC23 - ECT Sensor System Fault . . . . . . . 1A-107
DTC24 - Accelerator Sensor System Fault . 1A-112
DTC25 - Vehicle Speed Sensor System
Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-116
DTC28 - PTO Accelerator Sensor System
Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-120
DTC31 - Idle Up Volume System Fault . . . . 1A-123
DTC33 - VIM Internal Fault (EEPROM Write
Error) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-127
DTC34 - ECM Internal Fault (Charge Circuit
Fault) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-129
DTC35 - VIM Internal Fault (A/D Conversion
Fault) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-132
DTC43 - ITP Sensor System Fault . . . . . . . . 1A-134
DTC44 - EGR Valve Position Sensor System
Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-139
DTC45 - EGR Valve System Fault . . . . . . . . 1A-144
DTC46 - Exhaust Brake System Fault . . . . . 1A-147
DTC51 - ECM Internal Fault (CPU Error / CPU
History Error) . . . . . . . . . . . . . . . . . . . . . . . . 1A-150
DTC52 - ECM Internal Fault
(Sub CPU Error) . . . . . . . . . . . . . . . . . . . . . . 1A-152
DTC61 - Intake Throttle Valve System Fault 1A-154
DTC71 - Barometric Pressure Sensor Fault 1A-157
DTC81 - Clutch Switch System Fault . . . . . . 1A-159
DTC82 - Neutral Switch System Fault . . . . . 1A-163
DTC84 - CAN Communication Fault
(CAN Bus Error) . . . . . . . . . . . . . . . . . . . . . . 1A-166
DTC86 - CAN Communication Fault
(CAN Timeout Error) . . . . . . . . . . . . . . . . . . . 1A-169
DTC115 - Common Rail Pressure Sensor Fixed
Output Fault . . . . . . . . . . . . . . . . . . . . . . . . . 1A-172

ENGINE

Engine Control System

CONTENTS
Engine Control System 1A-1
DTC118 - Common Rail Pressure Fault
(Control System) . . . . . . . . . . . . . . . . . . . . . 1A-177
DTC158 - Injector Power Supply System Short
(Common 1) . . . . . . . . . . . . . . . . . . . . . . . . . 1A-182
DTC159 - Injector Power Supply System Short
(Common 2) . . . . . . . . . . . . . . . . . . . . . . . . . 1A-186
DTC211 - Fuel Temperature Sensor System
Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-190
DTC217 - SCV Drive System Short . . . . . . . 1A-195
DTC227 - No Pump Pressure Feed (Fuel Leak)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-198
DTC241 - Idle Position Switch Circuit Open
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-203
DTC242 - Idle Position Switch Circuit Short . 1A-206
DTC245 - Common Rail Pressure Sensor
System Fault . . . . . . . . . . . . . . . . . . . . . . . . 1A-209
DTC247 - SCV Drive System Fault . . . . . . . 1A-215
DTC271 - Cylinder 1 (Injector Drive System)
Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-219
DTC272 - Cylinder 2 (Injector Drive System)
Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-223
DTC273 - Cylinder 3 (Injector Drive System)
Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-227
DTC274 - Cylinder 4 (Injector Drive System)
Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-231
DTC277 - Injector Power Supply System Open
Wiring Fault (Common 1) . . . . . . . . . . . . . . . 1A-235
DTC278 - Injector Power Supply System Open
Wiring Fault (Common 2) . . . . . . . . . . . . . . . 1A-239
DTC416 - Main Relay System Fault . . . . . . . 1A-243
DTC417 - Starter Switch System Fault . . . . 1A-246
DTC543 - High Engine Speed Error . . . . . . . 1A-249
Default Matrix Table . . . . . . . . . . . . . . . . . . . 1A-250
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . 1A-256
Wiring Harness Repair: Shielded Cable . . . . . 1A-257
Removal Procedure . . . . . . . . . . . . . . . . . . . 1A-257
Installation Procedure . . . . . . . . . . . . . . . . . 1A-257
Twisted Leads . . . . . . . . . . . . . . . . . . . . . . . . . 1A-258
Removal Procedure . . . . . . . . . . . . . . . . . . . 1A-258
Installation Procedure . . . . . . . . . . . . . . . . . 1A-258
Weather-Pack Connector . . . . . . . . . . . . . . . . 1A-260
Removal Procedure . . . . . . . . . . . . . . . . . . . 1A-260
Installation Procedure . . . . . . . . . . . . . . . . . 1A-260
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . 1A-261
Com-Pack III . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-262
General Information . . . . . . . . . . . . . . . . . . . 1A-262
Metri-Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A-263
Removal Procedure . . . . . . . . . . . . . . . . . . . 1A-263
Installation Procedure . . . . . . . . . . . . . . . . . 1A-263
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . 1A-263