Mitsubishi Forklift Trucks GM 4.3L G6 LPG Fuel System Service Manual Supplement – FGC35K FGC70K

Description

Mitsubishi Forklift Trucks GM 4.3L G6 LPG Fuel System Service Manual Supplement

This service manual supplement has been developed to provide the service technician with a complete understanding of the IMPCO-certified fuel and emission systems used on the GM 4.3L engine in Mitsubishi forklift trucks. It is designed to be used alongside the base engine manual and the OEM service manual when diagnosing fuel or electrical problems on the FGC35K and FGC70K model forklifts running on LPG (propane).

File Details

• Manual Type: Fuel System Service Manual Supplement
• Brand: Mitsubishi Forklift Trucks
• Engine: GM 4.3L LPG (Propane)
• Models Covered: FGC35K, FGC70K
• Fuel System: IMPCO-certified LPG fuel and emission system
• Language: English
• Page Count: 402 pages
• File Format: PDF

Chapters Covered

• 1 – General Information
  • Glossary of terms and acronyms
  • How to identify the engine year
  • Servicing your emissions certified engine
  • Fuel quality requirements
  • Fuel system cautions
  • Warnings, cautions and notes
  • Proper use of this service manual, tools and equipment
• 2 – Maintenance
  • Serpentine belt system
  • Cooling system and coolant
  • Engine electrical system maintenance
  • Engine crankcase oil
  • Fuel system inspection and maintenance
  • Electronic Pressure Regulator (EPR) maintenance and inspection
  • Air fuel mixer/throttle control device maintenance and inspection
  • Exhaust system and catalytic converter inspection and maintenance
• 3 – LPG Fuel System
  • Description and operation of the fuel systems
  • LPG fuel tank
  • Service line
  • Fuel filter
  • LPG shut-off valve
  • Electronic Pressure Regulator (EPR)
  • Air fuel mixer
  • Throttle control device – drive by wire
  • Three way catalytic converter
  • Engine control module
  • Heated exhaust gas oxygen sensors
  • Coolant temperature sensor
  • Oil pressure sender
• 4 – LPG System Diagnosis
  • Fuel system description
  • Diagnostic aids
  • Pressure gauges
  • Test description
• 5 – LPG Symptom Diagnostics
  • Intermittent
  • No start
  • Hard start
  • Cuts out, misses
  • Hesitation, sag, stumble
  • Backfire
  • Lack of power, sluggishness, or sponginess
  • Poor fuel economy
  • Rough, unstable, or incorrect idle, stalling
  • Surges/chuggles
  • Crankcase ventilation system inspection/diagnosis
• 6 – Diagnostic Scan Tool
  • DST installation instructions
  • Installing the USB adapter driver
  • Password login
  • Password dialog box functions
  • Connecting the PC to the Spectrum fuel system
  • DST service pages
  • Spark kill
  • Injector kill
  • DBW test mode
  • External power test
  • Plot/log menu functions
  • DST plot interface functions
  • DST logger
  • Reprogramming the ECM
  • Malfunction indicator lamp (MIL)
  • Spectrum diagnostic trouble codes (DTC)
  • DLC communication error
  • Blink code function
  • Intermittent problems
• 7 – Engine Wiring Schematic
  • Chassis schematic
  • Engine schematic
  • Engine wiring schematic
  • Electrical flow diagram
  • ECM power, power relay controls & ECM ground circuits
  • ECM engine / fuel sensor circuits
  • ECM actuator circuits
  • ECM interface connector circuits
  • ECM EPR and diagnostic connector circuits
• 8 – Engine Wire Harness Repair
  • On-vehicle service wire harness repair
  • Connectors and terminals
  • Micro-pack
  • Metri-pack
  • Weather-pack
• 9 – Diagnostic Trouble Codes (DTCs)
  • OBD system check/MIL
  • Ignition control system diagnostic chart
  • DTC-16 through DTC-2301 (complete diagnostic charts for every code)
• 10 – Servicing the Fuel System
  • Engine control module
  • Engine wire harness replacement
  • Fuel temperature sensor replacement
  • Oil pressure sender
  • Temperature manifold pressure sensor (TMAP)
  • FT150 fuel mixer
  • Vacuum line
  • Engine coolant temperature sensor (ECT)
  • Heated exhaust gas oxygen sensor (HEGO)
  • Propane fuel system pressure relief
  • Fuel mixer
  • Electronic Pressure Regulator (EPR)
  • Mixer to throttle body O-ring replacement
  • Throttle body replacement
  • Shut-off valve replacement
  • EPR mounting bracket
  • ECM mounting bracket
  • LPG fuel system pressure check
  • LPG fuel control system check
  • Propane fuel system leak test
  • Restricted exhaust system diagnosis
  • Catalytic converter
  • EPR coolant hose replacement
• 11 – LPG Parts Diagram
  • Mixer and throttle body assembly (new)
  • Mixer and throttle body assembly (former)
  • EPR assembly
  • Regulator repair
  • Hose assemblies coolant/vacuum/fuel
  • Engine control module
  • Sensors
  • Exhaust system
  • Service tools
• 12 – Appendix
  • Altitude vs. barometric pressure
  • Ignition system specifications
  • Extended ECT temperature vs. resistance

This Mitsubishi Forklift Trucks GM 4.3L G6 LPG Fuel System Service Manual Supplement is far more than a collection of repair steps — it is the definitive technical reference for any technician working on the IMPCO-certified propane fuel system used in FGC35K and FGC70K forklifts. The document opens with a comprehensive glossary that decodes every acronym and technical term you will encounter, from AVV (Air Valve Vacuum) and EPR (Electronic Pressure Regulator) to HEGO (Heated Exhaust Gas Oxygen) and TMAP (Temperature Manifold Absolute Pressure). It then walks through the entire LPG fuel system architecture, explaining exactly how liquid propane moves from the tank through the filter, shut-off valve, EPR, mixer, and throttle body before being burned in the engine and cleaned by the three-way catalytic converter. What sets this manual apart is the depth of its diagnostic content. The LPG Symptom Diagnostics chapter alone spans dozens of pages, covering every conceivable complaint from intermittent no-starts and backfires to hesitation, poor fuel economy, and surging. Each symptom table walks through fuel system checks, ignition system checks, sensor checks, and engine mechanical checks in a logical order that leads directly to the fault. The Diagnostic Trouble Code section is equally thorough, with individual diagnostic charts for every DTC from DTC-16 (Never Crank Synced at Start) through DTC-2301 (Primary Coil Shorted). Each chart provides step-by-step instructions, expected values, and clear yes/no paths to guide you to the root cause without guesswork.

The manual also includes the complete engine wiring schematics — ECM power and ground circuits, sensor circuits, actuator circuits, EPR and diagnostic connector circuits — all laid out clearly so you can trace any electrical fault with confidence. For technicians using the Diagnostic Scan Tool (DST), the manual covers installation, password login, service pages, plot and log functions, spark kill, injector kill, DBW test mode, and ECM reprogramming in full detail. The servicing section provides removal and installation procedures for every fuel system component: the ECM, wire harness, fuel temperature sensor, oil pressure sender, TMAP sensor, FT150 fuel mixer, ECT sensor, HEGO sensors, electronic pressure regulator, shut-off valve, throttle body, and more. Each procedure includes torque specifications, safety warnings, and leak-check requirements so the job is done right the first time.

What This Manual Enables You to Do

• Diagnose LPG fuel system faults using factory diagnostic charts, symptom tables, and DTC flow charts that lead directly to the failed component.
• Service the Electronic Pressure Regulator (EPR) including disassembly, repair kit installation, and reassembly with precise torque values and measurement specifications.
• Repair the FT150 fuel mixer and throttle body using exploded parts diagrams, O-ring replacement procedures, and proper torque sequences.
• Trace electrical faults through complete engine wiring schematics showing every ECM pin, connector, wire color, and circuit path.
• Use the Diagnostic Scan Tool (DST) to read and clear DTCs, run spark and injector kill tests, reprogram the ECM, and capture live data plots.
• Maintain the LPG fuel system using the factory-recommended maintenance schedule including fuel filter replacement, EPR oil draining, leak testing, and coolant hose inspection.
• Replace sensors and actuators with step-by-step removal and installation procedures for the TMAP, ECT, HEGO, fuel temperature sensor, oil pressure sender, and more.

Because this is an emissions-certified engine, following the correct procedures and specifications is not optional — it is essential for maintaining compliance, ensuring safe operation, and preventing damage to the catalytic converter, oxygen sensors, and ECM. The Mitsubishi Forklift Trucks GM 4.3L G6 LPG Fuel System Service Manual Supplement gives you the same technical information that factory-trained technicians use, organized in a way that makes even complex diagnostics straightforward.

Whether you are troubleshooting a hard-start condition on an FGC35K, diagnosing a P1171 EPR pressure fault on an FGC70K, or rebuilding an electronic pressure regulator, this manual provides the exact specifications, procedures, and diagnostic logic you need. Every chart, table, and diagram has been reproduced in full to give you a complete picture of the IMPCO-certified fuel system — not just what to do, but why you are doing it and what the readings mean.

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Instant PDF Delivery

This Mitsubishi Forklift Trucks GM 4.3L G6 LPG Fuel System Service Manual Supplement is delivered as an instant PDF download after payment. No shipping, no waiting, no physical media to lose. The file is fully printable and can be viewed on any device — laptop, tablet, or smartphone — so you can bring it right to the forklift when you are working. Whether you are a professional technician, a fleet maintenance manager, or an operator who prefers to handle repairs in-house, having this manual on hand means faster diagnostics, correct repairs, and fewer callbacks. The PDF format lets you zoom in on wiring schematics, print specific pages for the shop floor, and search for the exact DTC or specification you need without flipping through a paper book.

Do not waste time with generic manuals or incomplete online information. Get the complete, vehicle-specific Mitsubishi Forklift Trucks GM 4.3L G6 LPG Fuel System Service Manual Supplement and service your FGC35K or FGC70K with confidence. Download it now and have the entire IMPCO-certified fuel system at your fingertips.