Engine Course Curriculum - D301

D301

Advanced Aftertreatment and SCR Diagnostics

Advanced students learn to solve repeat, intermittent and multi code aftertreatment failures. The course emphasizes graphing and correlating data, sensor rationality, conversion efficiency, complex electrical testing and engine related causes of aftertreatment damage.

What Students Will Be Able to Do
  • Graph and compare pressure, temperature, dosing and NOx data.
  • Evaluate sensor rationality and expected system response.
  • Diagnose intermittent wiring, power, ground and network faults.
  • Assess SCR dosing performance and conversion efficiency.
  • Distinguish DPF restriction, ash, face plugging and thermal damage.
  • Identify engine, fuel, air, oil or coolant causes of repeated failures.
  • Create and verify a root cause repair plan for a complex case.
Level Expert
Duration 4 days / 24 instructional hours
Tuition $2,295 CAD
Delivery Theory demonstrations and hands on shop training
Prerequisite D201 plus strong electrical and scan tool skills. Instructor approval is recommended.
Completion Certificate of Completion
Day 1 - Advanced data analysis
Topics and Knowledge Practical Learning Activities
  • Expected values, plausibility and sensor rationality
  • Graphing temperature, pressure and NOx data
  • Code relationships, inducement and intermittent fault strategy
  • Separating engine and aftertreatment symptoms
  • Graph and interpret a recorded drive cycle
  • Develop a prioritized diagnostic plan
Day 2 - Advanced SCR diagnosis
Topics and Knowledge Practical Learning Activities
  • DEF dosing quantity and distribution concepts
  • NOx sensor bias and rationality
  • SCR conversion efficiency and catalyst conditions
  • Crystallization, decomposition and exhaust temperature influence
  • Analyze an SCR efficiency case
  • Compare dosing, temperature and NOx evidence
Day 3 - Advanced DPF and electrical diagnosis
Topics and Knowledge Practical Learning Activities
  • Wiring diagrams, connectors, power, ground and signal tests
  • Stationary regeneration prerequisites and safety
  • Cleaning versus replacement factors
  • Reset, relearn, monitored road test and documentation
  • Diagnose an introduced circuit fault
  • Prepare a repair and verification plan
  • Complete a final monitored test or case study
Day 4 - Root cause case studies and final verification
Topics and Knowledge Practical Learning Activities
  • Air, fuel, injector, turbocharger, oil and coolant contributors
  • Multiple code case analysis
  • Post repair regeneration and monitored road test strategy
  • Comeback prevention, documentation and driver guidance
  • Complete a complex capstone diagnosis
  • Present a root cause repair and verification 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.

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