2023 Edition

ASE L1 Practice Test

ASE identifies Advanced Engine Performance Specialist as an individual service area (L1). The auto maintenance and light repair service area involves the following components:
• General Powertrain Diagnosis
• Computerized Powertrain Control Diagnosis
• Ignition Systems Diagnosis
• Fuel and Air Inductor Systems Diagnosis
• Emission Control Systems Diagnosis
• I/M Failure Diagnosis
This free sample ASE L1 Practice Test below consists of 12 questions organized within 6 sections.
Tests.com's ASE L1 Practice Test was written by Dr. John Kershaw, an ASE test prep expert: ASE test question developer; ASE Certified Master Technician; ASE Master Truck Technician; and Auto Industry Technical Instructor.  Dr. Kershaw was among the first to receive ASE certification in 1972. 
For the complete practice test, flash cards, exam review and testing tips, check out Tests.com's ASE L1 Practice Exam.

General Powertrain Diagnosis

1. An engine will not start. The technician uses a scan tool and finds DTC (Diagnostic Trouble Code) P0335 (Crankshaft Position Sensor [CKP]) stored. This vehicle has electronic ignition without a distributor. Which of the following is the MOST likely cause?
2. The engine cranks but will not start. Which of the following should be checked first?

Computerized Powertrain Control Diagnosis

3. The OBD II (On Board Diagnostic Level 2) system on a vehicle interprets a disconnected spark plug as a misfire that could damage the three-way catalyst. On which trip will the ECM or PCM MOST likely turn on the Malfunction Indicator Lamp (MIL)?
4. Two technicians are discussing the ECM (engine control module) reprogramming process. Technician A says the first step in the reprogramming procedure is to determine the current software needed. Technician B says in most cases using the factory scan tool or software is needed for reprogramming. Who is right?
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Ignition Systems Diagnosis

5. A vehicle with a no-start concern has been checked with a spark checker and has no spark to the plugs. Technician A says to test for battery voltage at the ignition coil by connecting the red lead of a DMM (Digital Multimeter) to the coil negative terminal and black lead to a good ground. Technician B says with the DMM red lead on the coil negative terminal and the black lead grounded, the voltage should fluctuate while cranking the engine. Who is right?
6. A vehicle has a stored and active misfire DTC (diagnostic trouble code) on a rough running engine. A broken valve spring is suspected. Which of the following tests could detect a broken valve spring?

Fuel and Air Inductor Systems Diagnosis

7. A vehicle has a stored and active misfire DTC (diagnostic trouble code) on a rough running engine. A broken valve spring is suspected. Which of the following tests could detect a broken valve spring?
8. Two technicians are explaining emission diagnosis of the fuel system. Technician A says an ignition misfire will increase CO and HC emissions and set a DTC (Diagnostic Trouble Code). Technician B says a misfire caused by a lean condition will increase HC and CO emissions without a DTC being set. Who is right?

Emission Control Systems Diagnosis

9. A vehicle comes in with the MIL (malfunction indicator light) on with DTC (Diagnostic Trouble Code) P0456 (small leak detected in EVAP canister system). Technician A says a defective vent solenoid or a leak could be the cause. Technician B says a wrong or defective gas cap could be the cause. Who is right?
10. Which of the following would indicate a closed EGR (Exhaust Gas Recirculation) valve?

I/M Failure Diagnosis

11. Which I/M (Inspection/Maintenance) test uses a dynamometer that places a "single weight" load on the vehicle?
12. An engine with SFI (sequential fuel injection) has low power. The emission readings on a 5-gas analyzer suggest which of the following causes?

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Quality starts with who wrote the material.
Our practice exam writer
Written by:
Dr. John Kershaw
ASE Test Prep Expert

ASE Test Question Developer

ASE Certified Master Technician

ASE Master Truck Technician

Auto Industry Technical Instructor

Among first ASE Certified in 1972
Actual ASE A6 Topics

• General Electric/Electronic 
• Battery and Starting Systems
• Charging Systems
• Lighting Systems
• Instrument Cluster/ Driver Info.
• Body Electrical Systems 


Number of Questions on the Actual ASE A Series Tests

A1 – Engine Repair (60)
A2 – Automatic Transmission/Transaxle (60)
A3 – Manual Drive Train & Axles (50)
A4 – Suspension & Steering (50)
A5 – Brakes (55)
A6 – Electrical/Electronic Systems (60)
A7 – Heating & Air Conditioning (60)
A8 – Engine Performance (60)
A9 – Light Vehicle Diesel Engines (60)