Mitsubishi Forklift 4G63, 4G64, 6G72 Service Manual

Technical Scope of the Mitsubishi 4G63, 4G64, 6G72 LP-Gas Supplement

• Covers 2001–2002 Mitsubishi forklift trucks equipped with 4G63, 4G64, and 6G72 engines utilizing the S-15G LP-gas system
• Official Mitsubishi publication P/N 99729-75100
• Contains 47 pages of system diagrams, diagnostic screen layouts, and troubleshooting trees
• File link appears in your order confirmation straight away
• OCR text layer lets you jump to a torque spec by keyword
• Suitable for printing individual sections for shop-floor use
• This 2001 supplemental publication provides the necessary data for configuring the S-15G emissions control system, an update introduced to meet early CARB Tier 1 requirements.

System Coverage and Diagnostic Procedures

The documentation provides a detailed technical overview of the S-15G fuel management architecture, specifically outlining the integration between the ECU, fuel control solenoid valve (FCSV), and vaporizing converter. Sections detail the mechanical structure of the LP-gas tank, including pressure relief and liquid level indication, alongside operational principles for the carburetor and mixer assemblies. Users can navigate the diagnostic environment through descriptions of the S-15G screen layout, which provides monitoring capabilities for manifold absolute pressure, pedal angle units, and oxygen sensor voltage. The text delineates the criteria for both open-loop and closed-loop operation, emphasizing the specific conditions required for the ECU to regulate the air-fuel ratio at stoichiometric targets.

Specification Highlights and Operating Parameters

Diagnostic parameters and system thresholds are defined to assist in identifying potential operational deviations. For instance, the primary chamber pressure within the converter is specified at 9.8–14.7 kPa (0.1–0.15 kgf/cm²) [1.4–2.1 psi] for correct operation. Engine manifold pressure for the 4G63 and 4G64 is documented at 35–45 kPa at idle, rising to 42–47 kPa at high idle. A pedal angle of 35 +/- 5 units is the target value for the throttle sensor potentiometer. System fault indicators, such as the blink codes for fuel system errors or battery voltage anomalies, are explained to clarify the output of the ECU diagnostic routine. This OEM service supplement covers the essential fuel system components and diagnostic routines for the 2001–2002 Mitsubishi 4G63, 4G64, and 6G72 LPG-powered forklift series.

Document Reference: Part No. 99729-75100