Jan 28, 2022  
2021-2022 College Catalog 
    
2021-2022 College Catalog
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AUT 126 - Engine Performance and Driveability Troubleshooting

3 Credits, 7 Contact Hours
1 lecture period 6 lab periods

Diagnosis and repair of On-board Diagnostics Generation One (OBDI) and Two (OBDII) systems. Includes personal and environmental safety, general engine, computerized engine controls, ignition system, fuel, air induction, and exhaust systems, emissions control systems, and engine related service.

Prerequisite(s): AUT 128  
  button image Prior Learning and link to PLA webpage

Course Learning Outcomes
  1. Demonstrate knowledge of the 3 major systems of engine drivability.
  2. Demonstrate knowledge of engine mechanical systems and perform diagnosis on them.
  3. Demonstrate knowledge of fuel injection systems and perform diagnosis on them.
  4. Demonstrate knowledge of ignition systems and perform diagnosis on them.
  5. Demonstrate knowledge and proficiency with the Snap-On Verus Pro Scanner and service and obtain an NC3 certification. 
  6. Demonstrate knowledge of engine emission systems and perform diagnosis on them.
  7. Demonstrate knowledge on forced induction systems and perform diagnosis on them.

Outline:
  1. Personal and Environmental Safety
    1. Clothing and personal protection devices
    2. Fire extinguisher and alarm location and use
    3. Material Safety Data Sheets location and application
    4. Supplemental restraints de-activation during repairs
  2. General Engine Diagnosis and Repair
    1. Work order completion
    2. Identify and interpret engine performance concern
    3. Research and obtain vehicle and service information
    4. Locate and interpret vehicle and component identification numbers
    5. Inspect engine assemble for fuel, oil, coolant and other fluid leaks
    6. Diagnose abnormal engine noise or vibrations
    7. Diagnose abnormal exhaust color, odor and sound
    8. Perform engine vacuum and boost pressure tests
    9. Perform engine power balance test
    10. Perform cylinder cranking compression tests
    11. Perform engine running compression test
    12. Perform cylinder leakage test
    13. Diagnose engine mechanical, electrical and fuel concerns with diagnostic equipment
    14. Utilize 4 or 5 gas analyzer to obtain exhaust readings and interpret data
    15. Verify engine operating temperature
  3. Computerized Engine Controls Diagnosis and Repair
    1. Retrieve, record and clear stored OBD I diagnostic trouble codes
    2. Retrieve, record and clear stored OBD II diagnostic trouble codes
    3. Diagnose emissions or driveabilty concerns with trouble codes present
    4. Diagnose emissions or driveability concerns with no trouble codes present
    5. Check for module communication errors using a scanner
    6. Inspect and test sensors, actuators, controls modules and circuits with a graphing multimeter
    7. Obtain and interpret scan tool data
    8. Access and use service information to perform a step by step diagnosis
    9. Diagnose driveability and emissions problems due to accessory interactions
    10. Perform active tests of actuators using a scan tool
    11. CAN communication systems
    12. OBD II driveabilty, no start and hard start problems
    13. Variable intake and valve timing
  4. Ignition System Diagnosis and Repair
    1. Diagnose distributer less ignition related problems
    2. Diagnose distributer ignition related problems
    3. Inspect and test primary circuit wiring and solid state components
    4. Inspect and test distributor operation
    5. Inspect and test secondary circuit wiring and components
    6. Inspect and test ignition coils
    7. Check and adjust ignition timing
    8. Inspect and test pick-up sensors or triggering devices
  5. Fuel, Air Induction and Exhaust Systems Diagnosis and Repair
    1. Diagnose no start and hard start problems
    2. Diagnose idle, stalling and dieseling problems
    3. Diagnose flooding , hesitation, poor performance and surging problems
    4. Diagnose engine misfire, poor mileage, and emissions problems
    5. Check fuel for contaminants and quality
    6. Inspect and test fuel pump systems for pressure, regulation and volume
    7. Replace fuel filters
    8. Inspect and test cold enrichment systems and components
    9. Inspect air induction system for vacuum leaks (unmetered air)
    10. Inspect and test fuel injectors
    11. Inspect the integrity of the exhaust system and components
    12. Perform exhaust system backpressure check
    13. Test the operation of turbocharger or supercharger systems
  6. Emissions Control Systems Diagnosis and Repair
    1. Diagnose oil leaks, emissions and driveability problems due to Positive Crankcase Ventilation (PCV) system failures
    2. Inspect and test Positive Crankcase Ventilation (PCV) systems
    3. Diagnose emissions and driveability problems due to Exhaust Gas Recirculation (EGR) system Failures
    4. Inspect and test Exhaust Gas Recirculation (EGR) system mechanical controls
    5. Inspect and test EGR system electrical sensors, controls and wiring
    6. Diagnose problems in the secondary air injection and catalytic converter systems
    7. Diagnose malfunctions in the Evaporation Emissions (EVAP) systems
    8. Interpret EVAP Diagnostic Trouble Codes (DTC)
  7. Engine Related Service
    1. Adjust engine mechanical or hydraulic valves
    2. Remove and replace timing belt and verify camshaft timing
    3. Remove and replace thermostat and gasket
    4. Inspect and test engine mechanical and electrical fans systems
    5. Perform fastener thread repairs, including removing broken bolts and installing inserts
    6. Perform oil and filter change
    7. Identify hybrid engine service precautions
  8. Double Timing Chain
    1. Removal
    2. Replacement


Effective Term:
Full Academic Year 2021/22



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