Vehicle Training Level 3 Heavy-Duty NGV Maintenance and Diagnostics Training

The number one challenge facing heavy-duty NGV technicians is how to distinguish between a fuel quality problem, a fuel system problem or an engine problem. This course is the only training available that recognizes these three elements as a system and teaches technicians how to diagnose and repair both heavy-duty natural gas engines and fuel systems.

The two-day course covers the components of all CNG fuel systems (regardless of manufacturer), as well as the Cummins ISL G and ISX12 G engines.  Emphasis is placed on the safety knowledge and repair practices that are unique for heavy-duty natural gas engines.

The training consists of operational theory taught in classroom, as well as twelve hands-on labs, including exercises using the Cummins Insite diagnostics tool.  It is a perfect complement to fuel system or engine manufacturer training.


NGV Essentials and Safety Practices

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Long Beach, CA October 21, 2019 Register

Who Should Attend?

  • Technicians with at least basic skills in heavy-duty vehicle repair, who will be maintaining, diagnosing and repairing NGVs.
  • Technicians familiar with the basic operation of vehicle diagnostic equipment.

Course Objectives

  • Identify and compare the properties and characteristics of CNG and LNG to diesel
  • Identify and describe the operation, maintenance, diagnostics, and repair of the low- and high-pressure components of a CNG fuel system
  • Properly assemble and re-assemble high-pressure tube fittings following safe procedures
  • Identify the unique components and operation of the Cummins ISL G and ISX12 G engines and emissions control system
  • Identify and describe fuel system and engine component maintenance intervals and procedures unique to Cummins powered NGVs
  • Describe basic diagnostic procedures for Cummins ISL G and ISX12 G engines
  • Identify diagnostic procedures and interpret data for electrical related issues, sensors and solenoids using wiring diagrams and other tools
  • Diagnose hard starting and/or poor drivability issues
  • Identify unique components and operation of LNG (saturated) and HPDI (unsaturated) LNG fuel systems
  • Increase the technician’s knowledge and preparation for successful completion of the Cummins ISL G and ISX12 G engine certification and/or the ASE H1 Alternative Fuels certification exam

Course Outline

Module 1 Introduction
Module 2 Understanding Natural Gas as a Vehicle Fuel
Module 3 High-Pressure CNG Fuel System Maintenance and Diagnostics
Module 4 Low-Pressure CNG Fuel System Maintenance and Diagnostics
Module 5 CNG Vehicle Depressurizing and Defueling
Module 6 Cummins ISL G Engine Operation and Diagnostics
Module 7 Cummins ISL G Engine Maintenance
Module 8 Cummins ISX12 G Engine Operation and Diagnostics
Module 9 Cummins ISX12 G Engine Maintenance
Module 10 LNG Fuel System Components and Operation


Instructional staff members of colleges, universities, private training organizations, fleets, dealers or manufacturers are not candidates for this course, but have numerous options for bringing NGVi’s training classes to their campuses or facilities. For more information, contact us at 800-510-6484.