ASE Advanced Engine Performance Specialist Certification Test (L1) Guide
The ASE Advanced Engine Performance Specialist (L1) Test is designed to measure a technician’s knowledge of the skills needed to diagnose emission failures and driveability problems on computer-controlled engine systems. It is an extension of the basic repair and diagnostic skills tested on the Automobile Engine Performance (A8) test. To register to take the L1 certification test, you must have passed the ASE Engine Performance (A8) Test.
A. General Powertrain Diagnosis
B. Computerized Powertrain Controls Diagnosis
C. Ignition System Diagnosis
D. Fuel Systems and Air Induction Systems Diagnosis
E. Emission Control Systems Diagnosis
F. I/M Failure Diagnosis
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- A recessed valve seat
- A leaking fuel injector
- An open O2 sensor heater circuit
- A faulty PCM
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