Kubota 4G PSI System

The presentation focuses on the Class IV Kubota WG2503 4G PSI LPG engine and fuel system, covering operation, diagnostics, maintenance, and troubleshooting procedures.

Key topics include:

• Truck display navigation and vehicle control functions, including maintenance settings and fault monitoring.
• CAN Bus architecture and communication, explaining how modules exchange information and how communication faults are diagnosed.
• Diagnostic systems (SPN/FMI and OBD-II) used to identify engine and sensor faults.
• Fuel management and emissions control, including open-loop and closed-loop operation, oxygen sensor functionality, fuel trim correction, and catalytic converter performance.
• Engine components and sensors, such as crankshaft and camshaft position sensors, coolant temperature sensors, MAP/IAT sensors, throttle position sensors, and foot pedal position sensors.
• PSI LPG fuel system components, including the lock-off valve, dual-stage regulator (vaporizer), DEPR regulator, throttle body, and pressure control systems.
• Diagnostic software and maintenance procedures, including fault code analysis, speed settings, starter circuit testing, compression testing, and transmission inching pedal adjustments.

Overall, the course provides technicians with the knowledge required to understand, diagnose, maintain, and repair the Kubota 4G PSI LPG engine and its electronic fuel management system.