Doosan G643E - Chapter 1. GENERAL INFORMATION; Precautions before Service

G643(E) Service Manual Index 5
Ignition Component Checks ................. 115
Inspection of Spark Plug Wires ............ 116
Inspection of Spark Plug ...................... 117
Inspection of EST Distributor................ 118
Inspection of Ignition Coil ..................... 120
Disassembly and Assembly......................... 120
Ignition Coil.......................................... 120
EST Distributor .................................... 121
Ignition Timing Adjustment for G643 Engine 123
Final Timing Verification....................... 124
Ignition Timing Adjustment for G643E Engine
................................................................... 125
Charging System ............................................. 126
General Description .................................... 126
Troubleshooting Procedure ......................... 129
STARTING SYSTEM......................................... 134
General Description .................................... 134
Diagnosis Procedure................................... 135
Start Relay Tests ........................................ 137
Troubleshooting .......................................... 138
Starter Repair ............................................. 139
Chapter 5. ENGINE MANAGEMENT
SYSTEM (EMS)
General Information......................................... 140
Specifications.............................................. 140
Component Location ................................... 145
G643E EMS (Engine Management System)
Overview .......................................................... 148
General Description .................................... 148
LPG Fuel System Operation........................ 151
Electronic Throttle System .......................... 159
SECM......................................................... 163
SECM Wiring Diagrams for G643E.............. 166
G643 EMS (Engine Management System)
Overview .......................................................... 168
General Description .................................... 168
LPG Fuel System Operation........................ 171
Electronic Throttle System .......................... 174
Ignition System ........................................... 175
SECM......................................................... 176
SECM (Load/Speed Management).............. 176
EMS Inspection and Repair..............................181
Engine Control Module[G643E]....................181
Crank Shaft Position Sensor [G643E] ..........182
IAT (Intake Air Temperature) Sensor [G643E
and G643] ...................................................184
OxygenSensor (Pre-Catalyst) [G643E].........185
Oxygen Sensor (Post-Catalyst) [G643E] ......186
ECT (Engine Coolant Temperature) Sensor
[G643E and G643].......................................187
Angle Sensor-Accelerator
[G643E and G643]
....................................................................190
Transmission Oil Temperature
Switch [G643E]
....................................................................191
Electronic Throttle Body
[G643E and G643].192
Chapter 6. LPG FUEL DELIVERY
SYSTEM
G643E LP System Inspection and Repair........193
Removal and Installation..............................193
Hose Connections ................................194
Removal and Installation of N-2007 LP
Regulator..............................................196
Removal and Installation of CA100 Mixer
for G643E.............................................197
Tests and Adjustments ................................199
N-2007 Regulator Service Testing ........199
AVV (Air Valve Vacuum) Testing ..........201
Idle Mixture Adjustment ........................201
Parts Description .........................................205
CA100 Mixer for G643E Engine............205
N-2007 Regulator for G643E Engine.....207
G643 LPG System Inspection and Repair .......209
Removal and Installation..............................209
Hose Connections ................................210
Removal and Installation of N-2001 LP
Regulator/Converter .............................211
Removal and Installation of CA100 Mixer
for G643 ...............................................212
Tests and Adjustments ................................214
N-2001 Regulator Service Testing ........214
AVV (Air Valve Vacuum) Testing ..........216
Idle Mixture Adjustment ........................216
G643 LP Fuel Systems with O2 Sensor 216
Parts Description .........................................218
CA100 Mixer for G643 Engine ..............218
CA100 Disassembly and Service ..........220
CA100 Disassembled Service...............221
N-2001 Regulator for G643 Engine .......222