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Master Course Outline
AMM 254
Compressed Natural Gas Vehicle Service and Repair


Credits: 2
Clock Hours per Quarter: 30

AA Discipline:

Lecture Hours:10    Lab Hours:20


Description
This course presents an introduction to compressed natural gas (CNG) vehicles. Students are required to gain an understanding of CNG theory, safety, regulations, maintenance and repair of CNG equipped vehicles. Students will perform diagnostic testing and analysis of failed CNG components. Students will apply basic competencies to grasp in-depth workings of CNG-fueled vehicles. This course will focus on combining classroom instruction and theory with the opportunity to apply theory through hands-on activities performed in the lab/shop. Co-requisites: AMM 152, 232, 242, 255.

Intended Learning Outcomes
  • Interpret and verify concern in CNG supplemental systems: determine necessary action.
  • Analyze symptoms and perform diagnostic procedures on vehicles with supplemental onboard diagnostic computer support systems.
  • Diagnose and repair no starting, hard starting, engine misfire, poor driveability, power loss, poor mileage, and emissions problems on vehicles OEM and supplemental sensors (e.g. manifold skin temperature, intake air temperature, natural gas temperature).
  • Diagnose and repair no starting, hard starting, engine misfire, poor driveability, power loss, poor mileage, and emissions problems on vehicles OEM and supplemental sensors (e.g. timing modification devices, ignition interrupt).
  • Diagnose and repair intermittent or complete failure of electric, electornic or mechanical devices (e.g. hour meters, fuel level indicators, fuel selection devices).
  • Interpret and verify fuel storage and dilivery concern; determine necessary repairs. Check all fuel system components to include fuel lock-off, valves, solenoids, manual shutoff, connections, fittings, hoses, and tubing for leaks, wear, installation and proper operation; repair or replace as needed.
  • Diagnose the cause of abnormal fuel flow through fuel carrying component.
  • Diagnose the cause of fuel odor or fuel loss by inspecting or testing the fuel supply system components such as valves, fuel supply container, pressure relief device (PRD) tubing and hoses; repair or replace as needed.
  • Diagnose the cause of inaccurate fuel level indicator reading; service, adjust, repair or replace as needed.
  • Interpret and verify air/fuel management concern, determine necessary repairs.
  • Diagnose hot or cold no-starting, hard starting, poor driveability, incorrect idle speed, poor idle, flooding, hesitation, surging, engine misfire, power loss, stalling, poor mileage, and lean or rich mixture problems on vehicles with variable or fixed venture type fuel systems; determine necessary repairs.
  • Diagnose hot or cold no-starting, hard starting, poor driveability, incorrect idle speed, poor idle, flooding, hesitation, surging, engine misfire, power loss, stalling, poor mileage, and lean or rich mixture problems on vehicles with fumigation or injection type fuel systems; determine necessary repairs.
  • Inspect and test cold enrichment system components; adjust or replace as needed.
  • Inspect and test fuel injectors; service or replace as needed.
  • Inspect and test vacuum and electrical components and connections of fuel system; repair or replace as needed.
  • Perform diagnostic procedures on vehicles with on-board computer/electronic fuel system support.
  • Interpret and verify general CNG maintenance concern; determine necessary repairs.
  • Follow manufacturer's maintenance schedule to ensure fluids and lubricants are at proper levels and serviced with recommended products.
  • Identify the process of recertification or replacement of fuel supply container(s) according to most current regulations (e.g., NGV-2, DTO); complete documentation; remove and replace fuel supply container, if required.
  • Inspect fuel supply container(s) and brackets as it relates to certification; data plate, working pressures, fuel supply container damage, valves, bolts, torque specifications, and all sealing and venting equipment.
  • Inspect air filters and fuel filter; service or replace as needed.
  • Inspect and ensure that all required emission control devices are present and functional.
  • Interpret and verify CNG fuel storage and delivery concern; determine necessary action.
  • Inspect, adjust, and test manual shut-off valve, service valve, check-valves, and solenoid valves; repair or replace as needed.
  • Empty fuel supply container according to manufacturer's procedures and all local, state and federal regulations. (Local procedures will vary and extreme care must be exercised if using actual fuel. Use of Inert gas is recommended for this task.)
  • Inspect and test fuel selection system components; repair or replace as needed.
  • Select and install swage, compression, flare, captive O-ring, NPT, and other fittings using manufacturer's recommended sealants when required.
  • Interpret and verify air/fuel management concern; determine necessary repairs.
  • Check for fuel system problems caused by fuel contamination.
  • Check air/fuel system integrity (e.g., fuel leaks, air leaks, components compatibility/application); determine necessary repairs.
  • Inspect and test fuel pressure regulation system components; adjust, repair or replace as needed.
  • Remove, clean, and reinstall throttle assemblies; adjust related linkages as needed.
  • Check/adjust idle speed and fuel mixtures according to manufacturer's procedures.
  • Interpret and verify fuel storage and handling complaint; determine necessary repairs.
  • Perform safe fueling procedures and determine fuel level.
  • Identify working pressures and demonstrate an understanding of fuel characteristics as they relate to temperature and fill procedures.
  • Empty fuel system using industry practices or manufacturer's procedures and all local, state, and federal regulations. (Local procedures will vary and extreme care must be exercised if using actual fuel. Use of inert gas is recommended for this task.)

  • Course Topics
  • Diagnose and repair supplemental systems.
  • Fuel storage and delivery.
  • Air/fuel management.
  • General CNG maintenance.
  • CNG air/fuel management.
  • CNG fuel storage and handling.

  • Syllabi Listing See ALL Quarters
    Course
    Year Quarter
    Item
    Instructor  
    AMM 254
    Fall 2014
    0259
    James Haun


    Two Year Projected Schedule

    Year One* Year Two**
    Fall
    Winter
    Spring
    Summer
    Mini 
    Fall
    Winter
    Spring
    Summer
    Mini
     
     
     
     
     
     
     
    X
    X
     

    *If fall quarter starts on an odd year (2003, 2005, etc.), it's Year One.
    **
    If fall quarter starts on an even year (2002, 2004, etc.), it's Year Two.