Table Of Contents - Isuzu 4HL1 Workshop Manual

Table of Contents

Engine3
Engine Control System3
Table Of Contents3
Precautions On Service4
Circuit Test Tools4
Damage By Electrostatic Discharge4
Wire Color4
Function And Operation5
Electronic Control System5
Ecm Description5
Function Of Ecm5
Calculation Of Desired Injection Quantity7
Injector Control7
Scv Control (Pump Control)7
Intake Throttle Control8
Egr Control9
Qws Control10
Qws Working Conditions10
Idle Stop Control Working Conditions10
Exhaust Brake Control10
Powertrain System Components11
Component Layout - Vehicle Side11
Component Layout - Engine Side12
Ect Sensor12
Egr Valve And Egr Valve Position Sensor13
Intake Throttle Valve And Itp Sensor13
Cmp Sensor13
Ckp Sensor14
Scv14
Ft Sensor14
Common Rail Pressure Sensor14
Iat Sensor15
Idle Position Switch15
Ap Sensor15
Clutch Switch15
Vs Sensor16
Exhaust Brake Solenoid Valve16
Neutral Switch16
Atmospheric Pressure Sensor16
Vim17
Check Engine Lamp (Mil)17
Dlc17
Fuse Layout18
Spare Fuse18
Relay Layout20
Ecm Circuit Diagram22
Vim Circuit Diagram23
Ecm/Vim Circuit Diagram24
Connector List31
H-735
H-835
Ecm Pinouts35
81-Way Connector (Engine Side)36
40-Way Connector (Vehicle Side)37
Vim Pinouts38
26-Way Connector39
16-Way Connector39
12-Way Connector40
22-Way Connector40
Strategy-Based Diagnostics40
Strategy-Based System Diagnostics40
Dtc Stored41
No Dtc41
No Matching Symptom41
Intermittents41
Non-Oem Parts42
Poor Vehicle Maintenance42
Visual/Physical Engine Compartment Inspection42
Basic Knowledge Of Tools Required42
Comprehensive Component Monitor Diagnostic Operation43
Input Components43
Diagnostic Executive43
Diagnostic Information43
Verifying Vehicle Repair44
Diagnostic Trouble Code (Dtc)44
Reading Diagnostic Trouble Codes44
Diagnostic Trouble Codes Not Stored44
Diagnostic Trouble Codes Stored45
Clearing Diagnostic Trouble Codes45
Ecm Voltage And Continuity Test/Measurement46
Functional Check List46
Hearing Diagnostic46
Key Points On Hearing46
Engine Control System Diagnostic Chart47
Circuit Description49
Diagnostic Aids49
Test Description49
On-Board Diagnostic (Obd) System Check . 1A-4749
Inactive Check Engine Lamp Check52
Unblinking Check Engine Lamp Check56
Ecm Power Supply And Grounding System Circuit Check58
Diagnosis With Tech 2 Scan Tool61
Tech 2 Scan Tool61
Features Of Tech 261
Menu Breakdown64
Diagnostic Trouble Codes64
Data Display64
Snapshot64
Replaying Recorded Data Graph65
Snapshot After Data Indication65
Snapshot After Determination Of Trigger Type65
Actuator Test66
Ecm Date69
Ecm Data78
Diagnostic Chart90
Dtc14 - Cmp Sensor System Fault95
Major Faulty Event95
Conditions For Setting The Dtc95
Action Taken When The Dtc Sets95
Dtc15 - Ckp Sensor System Fault99
Conditions For Clearing Mil/Dtc99
Dtc18 - Starter Degradation (For Only Vehicles Equipped With Idle Stop Function)103
Dtc22 - Iat Sensor System Fault105
Characteristics Of Iat Sensor (Reference)108
Dtc23 - Ect Sensor System Fault109
Dtc24 - Accelerator Sensor System Fault114
Fault115
Dtc25 - Vehicle Speed Sensor System Fault118
Dtc28 - Pto Accelerator Sensor System Fault122
Dtc31 - Idle Up Volume System Fault125
Idle Up Volume Switch Description128
Dtc33 - Vim Internal Fault (Eeprom Write Error)129
Dtc34 - Ecm Internal Fault (Charge Circuit Fault)131
Fault)132
Dtc35 - Vim Internal Fault (A/D Conversion Fault)134
Dtc43 - Itp Sensor System Fault136
Intake Throttle Valve Description140
Dtc44 - Egr Valve Position Sensor System Fault141
Dtc45 - Egr Valve System Fault146
Dtc46 - Exhaust Brake System Fault149
Dtc51 - Ecm Internal Fault (Cpu Error / Cpu History Error)152
Dtc52 - Ecm Internal Fault (Sub Cpu Error)154
Dtc61 - Intake Throttle Valve System Fault156
Dtc71 - Barometric Pressure Sensor Fault159
Dtc81 - Clutch Switch System Fault161
Second But Not More Than 3 Seconds. (Press The Accelerator Pedal.) 2. Turn On The Idle Position Switch For Not Less Than161
Second But Not More Than 3 Seconds. (Release The Accelerator Pedal.) 3. Turn Off The Idle Position Switch For Not Less Than161
Second But Not More Than 3 Seconds. (Release The Accelerator Pedal.)161
Second But Not More Than 3 Seconds. (Press The Accelerator Pedal.) 6. After The Above Operations Are Properly Completed, The Check Engine Lamp (Mil) I162
Turn Off The Starter Switch. Wait For 5 Seconds And Turn On The Starter Switch Again162
If The Dtc Is Not Detected, The Possible Cause Is Intermittent (Intermittent Fault)162
Refer To Obd System Check162
Dtc82 - Neutral Switch System Fault165
Dtc84 - Can Communication Fault (Can Bus Error)168
Go To Step169
Dtc86 - Can Communication Fault (Can Timeout Error)171
Dtc115 - Common Rail Pressure Sensor Fixed Output Fault174
Dtc118 - Common Rail Pressure Fault (Control System)179
Dtc158 - Injector Power Supply System Short (Common 1)184
Dtc159 - Injector Power Supply System Short (Common 2)188
Dtc211 - Fuel Temperature Sensor System Fault192
Characteristics Of Ft Sensor (Reference)196
Dtc217 - Scv Drive System Short197
Dtc227 - No Pump Pressure Feed (Fuel Leak)200
Dtc241 - Idle Position Switch Circuit Open Wiring205
Dtc242 - Idle Position Switch Circuit Short208
Dtc245 - Common Rail Pressure Sensor System Fault211
Dtc247 - Scv Drive System Fault217
Dtc271 - Cylinder 1 (Injector Drive System) Fault221
Dtc272 - Cylinder 2 (Injector Drive System) Fault225
Dtc273 - Cylinder 3 (Injector Drive System) Fault229
Dtc274 - Cylinder 4 (Injector Drive System) Fault233
Dtc277 - Injector Power Supply System Open Wiring Fault (Common 1)237
Dtc278 - Injector Power Supply System Open Wiring Fault (Common 2)241
Dtc416 - Main Relay System Fault245
Dtc417 - Starter Switch System Fault248
Dtc543 - High Engine Speed Error251
Default Matrix Table252
Special Tools258
Wiring Harness Repair: Shielded Cable259
Removal Procedure259
Installation Procedure259
Twisted Leads260
Weather-Pack Connector262
Com-Pack Iii264
General Information264
Metri-Pack265