Table of Contents
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Index
LPG Fuel Supply........................................................8
LPG Fuel Tanks..........................................................9
Installing LPG Fuel Tanks ..........................................9
LPG Fuel Tank Components ....................................10
Fuel Gauge ..............................................................10
Service Valve ...........................................................10
Quick Disconnect Coupling...................................... 11
Filler Valve................................................................ 11
Indication of Engine Serial Number..........................12
Specifications(G420E) .............................................13
Specifications(G424E) .............................................14
MI-04 General Description .......................................15
MI-04 LP Fuel Filter..................................................17
MI-04 Fuel Lock-Off (Electric) ..................................17
MI-04 N-2001 Regulator/Converter..........................18
N-2001 Theory of Operation ....................................19
MI-04 N-CA55-500TR Mixer ....................................20
Operation .................................................................20
MI-04 Electronic Throttle..........................................22
MI-04 Fuel Trim Valve ..............................................23
Heated Exhaust Gas Oxygen Sensor (HEGO) ........24
MI-04 SECM (General Description) .........................25
MI-04 SECM (Fuel Management) ............................25
MI-04 SECM (Load/Speed Management)................27
MI-04 Ignition management .....................................29
Tier
G420E/G424E
LP Engine
Test Fuel System for Leaks ......................................30
Inspect Engine for Fluid Leaks .................................30
Inspect Vacuum Lines and Fittings...........................30
Inspect Electrical System .........................................30
Inspect Acceleration Pedal Operation ......................31
Check Coolant Level ................................................31
Inspect Coolant Hoses .............................................31
Inspect Battery System ............................................31
Inspect Ignition System ............................................31
Replace Spark Plugs ................................................31
Replace LP Fuel Filter Element................................32
Testing Fuel Lock-off Operation................................33
nspection ..................................................................33
Fuel Trim Valve Inspection (FTV) .............................33
Inspect Air/Fuel Valve Mixer Assembly.....................33
Inspect for Intake Leaks ...........................................34
Inspect Throttle Assembly ........................................34
Checking the TMAP Sensor .....................................34
Inspect Engine for Exhaust Leaks............................34
Replace Oxygen Sensor ..........................................34
Maintenance Schedule.............................................35
Basic Troubleshooting ..............................................37
Advanced Diagnostics..............................................44
Reading Diagnostic Fault Codes..............................44
Memory ....................................................................45
Clearing Fault (DFC) Codes.....................................45
Fault Action Descriptions..........................................45
Fault List Definitions .................................................46
Table a. MI-04 Diagnostic Fault Codes (Flash
Codes)......................................................................48
Resistance Checks...................................................62
Voltage Checks.........................................................63
5
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