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 G643(E) Service Manual Index 5