This training is designed to help technicians understand, diagnose, and solve aftertreatment problems with confidence. you’ll learn how tier 4 systems work, how to interpret fault codes accurately, and apply a proven diagnostic strategy to eliminate guesswork and downtime.

In this module, you’ll learn what an aftertreatment system is, why it matters, how it evolved through emission tiers and their role in keeping diesel engines clean and compliant. 

In this module, you'll dive into the three key components of  aftertreatment system: the DOC, the DPF and the SCR. You’ll learn how each part works individually and how they all function together to keep diesel machines running clean.

In this module, you’ll learn about the most common aftertreatment failures, what causes them, how each issue affects engine performance and why understanding these faults is key to preventing derates, costly repairs, and downtime. 

In this module, you’ll learn about the three types of regeneration, when each one happens, how each type helps prevent clogs, derates, and costly downtime, and why managing regens is essential for a healthy aftertreatment system.

In this module, you’ll learn how to read, interpret, and troubleshoot fault codes like a pro. You will also learn how using diagnostic tools like Jaltest for live data, freeze frames, and fault history.

In this advanced training module, you'll walk through a full diagnostics session on a John Deere 944K Wheel Loader using Jaltest. This demo shows you how to diagnose and resolve real aftertreatment issues with confidence and precision.

In this final module, you’ll learn how to dive deeper into live data monitoring and sensor testing to identify hidden issues that block regeneration and trigger fault codes. You’ll explore how to interpret sensor values, verify component health, and run advanced system checks.