Title: Diagnose emissions and drivability concerns caused by the exhaust gas recirculation (EGR) system; inspect, test, service, and/or replace components; determine necessary action.
Course: Automotive Technology III (20104-III) > Section: Engine Performance: Emissions Control Systems Diagnosis and Repair

Diagnosis should include

- using a five-gas analyzer
- using a scan tool
- interpreting emissions testing results
- troubleshooting charts
- comparing test results to service materials and manufacturer guidelines.

Components should include electrical/electronic sensors, controls, wiring, tubing, exhaust passages, vacuum/pressure controls, filters, and hoses of the EGR system.

ASE Education Foundation
2017 Automobile Service Technology (AST) Level
VIII. Engine Performance
E. Emissions Control Systems Diagnosis and Repair
Task 3

Process/Skill Questions:

- What might the typical customer complaint be for a stuck-open EGR valve?
- What might be the consequences of having a plugged EGR system?
- What is the function/operation of the EGR system?