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Diesel Technician · Intermediate

Cummins ISX Diagnostics & Fault Code Mastery

Troubleshoot every ISX/ISX15 fault code like a dealer tech — without the dealer bill.

7h of content7 modules · 25 lessonsInstructor: Christopher Scott Sneed
Price
$49.99
Included with Pro Membership

About this course

A complete field-tested course on the modern Cummins ISX and ISX15 platform. Learn how to read SPN/FMI fault codes, follow OEM wiring diagrams, isolate sensor and actuator failures, and repair aftertreatment (DPF, DEF, SCR) problems with confidence. Built for owner-operators, fleet techs, and shop owners who need real answers, not parts-cannon guesses.

Full Curriculum

7 modules · 25 lessons · 0 quizzes
  1. 1
    ISX Platform Overview & Architecture
    • 1. ISX vs ISX15 vs Signature: Knowing What You Have15m
    • 2. ECM, Sensors & the J1939 Data Bus20m
    • 3. Tools of the Trade15m
  2. 2
    Reading & Interpreting Fault Codes (SPN/FMI)
    • 1. SPN + FMI Decoded20m
    • 2. Pulling Codes with Insite, JPRO & Generic Scanners15m
    • 3. Active vs Inactive, Derates & Lamps15m
  3. 3
    Master Fault Code Reference Library
    • 1. Top 40 ISX Fault Codes — Reference Table30m
    • 2. How to Prioritize Multiple Active Codes15m
  4. 4
    Wiring Diagrams & Circuit Diagnostics
    • 1. Reading a Cummins Wiring Diagram20m
    • 2. DVOM Techniques: Voltage Drop, Continuity, Ref Voltage20m
    • 3. CAN Bus Diagnostics (J1939)15m
  5. 5
    Aftertreatment: DPF, DEF & SCR Troubleshooting
    • 1. DPF Regeneration Strategy20m
    • 2. SCR, DEF & NOx Sensors20m
    • 3. EGR & VGT: The Boost-and-Bleed Balance15m
  6. 6
    Case Studies & Advanced Diagnostics
    • 1. Case Study: No-Start, No Codes20m
    • 2. Case Study: 5 mph Derate with SPN 524620m
    • 3. Case Study: Cylinder Misfire on Cold Start15m
    • 4. Final Review: Your Diagnostic Playbook15m
  7. 7
    Aftertreatment Diagnostic & Troubleshooting Deep Dive
    • 1. Aftertreatment System Walkthrough (DOC → DPF → Decomp Tube → SCR → AMOX)25m
    • 2. DPF Face — Soot Load, Delta-P, and Forced Regen Procedure25m
    • 3. DEF Quality, Dosing System & the 7 Common DEF Faults25m
    • 4. NOx Sensors, Conversion Efficiency & SPN 4364 Diagnosis20m
    • 5. 5-Minute Delta-P & Temp Sensor Diagnostic Circuit Test15m
    • 6. The Derate Ladder — SPN 5246 and How to Recover a Truck20m
    • 7. Tailpipe Smoke Diagnosis & Aftertreatment Contamination15m