ASE T1 Gasoline Engines (Medium/Heavy Truck) study plan

List the six major steps of a systematic no-start diagnosis and state the test performed at each step

Describe how to verify base engine integrity (compression, cylinder leak-down, vacuum) and interpret results

Explain the purpose and sequence of engine removal preparation steps (fluids, wiring, mounts, lifting)

Identify the location and function of major engine sensors and actuators on a gasoline medium/heavy truck engine

Write a diagnostic flow for an engine that cranks but does not start, including three prioritized tests

Differentiate rich, lean, and misfire symptoms using fuel trim and oxygen sensor data

Explain how to perform and interpret a cylinder balance or power balance test

Describe the operation of port fuel injection and identify the function of the fuel pressure regulator, pump, and injectors

Outline the steps to test fuel pressure, volume, and injector pulse width

Match five driveability complaints to likely root causes in fuel or engine mechanical systems

Explain the relationship between ignition timing, knock, and fuel octane

Describe how to test an ignition coil, spark plug wire, and spark plug using a scope or ohmmeter

Identify the components of a distributorless ignition system and state the function of the cam and crank sensors

Outline the procedure to check base timing and verify ignition advance

Diagnose a misfire using ignition secondary waveform interpretation

Describe the procedure to remove, inspect, and reinstall a cylinder head, including torque sequence and valve lash adjustment

Explain how to inspect valve springs, guides, and seats for wear and measure valve stem-to-guide clearance

Identify the parts of a camshaft and describe how to check cam lobe wear and timing chain/belt alignment

Explain how to measure cylinder bore taper and out-of-round and determine if boring is required

Describe crankshaft inspection steps including journal measurement, taper, and runout

Explain the operation of a full-flow oil filtration system and the function of the bypass valve

Describe how to test oil pressure and interpret low or high readings

Outline the steps to diagnose coolant loss, including pressure testing and combustion gas testing

Explain the function of the thermostat, water pump, and radiator and how to test each

Describe the procedure to bleed a cooling system and verify proper operation

Explain how to inspect and test the air induction system for restrictions and leaks

Describe the operation of the exhaust gas recirculation (EGR) system and how to test the EGR valve and ports

Identify the function of the turbocharger or supercharger and describe basic inspection steps for boost leaks

Explain how to test a charging system and starting system using a multimeter and load tester

Describe how to diagnose electrical faults using voltage drop testing and wiring diagrams

Integrate fuel, ignition, and mechanical test results to diagnose a complex driveability complaint

Explain how to use a scan tool to view live data and freeze frame for engine diagnosis

Describe the procedure to perform a compression test and interpret results with throttle position and engine temperature considerations

Outline the steps to diagnose an intermittent misfire using a lab scope and road test

Review and resolve three case-study style diagnostic scenarios

Review all domains using a practice test and identify weak areas

Explain engine installation procedures including alignment, torque specs, and post-installation checks

Describe the steps to verify engine rebuild quality including pre-oil, priming, and initial start-up procedures

Create a personal list of ten key facts or procedures to remember for the exam

Complete a timed practice exam and score at least 80%