Title: Inspect test, and/or replace fuel injectors.
Course: Automotive Technology III (20104-III) > Section: Engine Performance: Fuel, Air Induction, and Exhaust Systems Diagnosis and Repair

Procedure should include performing the following tests:

- Coil resistance test (ohmmeter)
- Flow test
- Oscilloscope signature test, checking for leaking nozzle and for presence of contaminated oil

ASE Education Foundation
2017 Automobile Service Technology (AST) Level
VIII. Engine Performance
D. Fuel, Air Induction, and Exhaust Systems Diagnosis and Repair
Task 6

Process/Skill Questions:

- What specialized tools may be necessary to test fuel injectors?
- What noise does an operating fuel injector make?
- Why is it important to identify fuel injector impedance before deciding to replace it?
- Why do fuel injectors have different colored electrical connections?