Engine Course Curriculum - D101

D101

DEF and Aftertreatment Fundamentals

Students learn why diesel aftertreatment systems are used, how exhaust moves through the system and how DEF, DOC, DPF and SCR components work together. The course focuses on safe inspection, DEF handling, maintenance and warning sign recognition.

What Students Will Be Able to Do

Explain the purpose of DOC, DPF, SCR, DEF and related sensors.
Trace exhaust flow through a typical aftertreatment system.
Handle, store and test DEF without contamination.
Identify major aftertreatment components on a truck.
Inspect for leaks, crystallization, damaged wiring and exhaust concerns.
Recognize warning lamps, regeneration messages and derate conditions.
Record basic inspection findings and maintenance recommendations.

Level	Starter
Duration	2 days / 12 instructional hours
Tuition	$895 CAD
Delivery	Theory demonstrations and hands on shop training
Prerequisite	No previous aftertreatment experience required.
Completion	Certificate of Completion

Day 1 - Emissions and system foundations

Topics and Knowledge	Practical Learning Activities
Hot exhaust and chemical safety Diesel emissions and aftertreatment purpose DOC, DPF, SCR, DEF and ammonia slip catalyst operation DEF tank, pump, heater, lines, doser and sensor identification	Trace system flow on a vehicle or training assembly Identify aftertreatment components

Day 2 - Maintenance and basic checks

Topics and Knowledge	Practical Learning Activities
DEF specifications, storage, handling and contamination DPF soot, ash and regeneration basics Warning lamps, messages, inducement and derate awareness Visual inspection and basic scan tool orientation	Check DEF quality or concentration Inspect for leaks, crystallization, wiring and exhaust damage Record codes and prepare a maintenance report

Student Evaluation

Safety and professional shop practices
Participation in demonstrations and practical activities
Short knowledge checks or review questions
Completion of assigned inspection, diagnostic or measurement worksheets
Final practical task, case study or instructor evaluation

Course Completion

Students who meet the attendance requirements and successfully participate in the required learning and evaluation activities will receive a Certificate of Completion for this course.

Build practical heavy-duty repair skills with training designed around real shop work.

Contact us to discuss the right starting level, upcoming class dates, group training or a customized program for your fleet or repair shop.