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Short answer: For most diesel mechanics and fleet owners in 2026, the Autel MaxiSys MS908CV II is the best heavy-duty truck scanner in the Autel lineup — it reads and clears faults over J1939 and J1708, runs full-system, OE-level diagnostics on Cummins, Caterpillar, Detroit, PACCAR, International and Volvo/Mack trucks, and supports bidirectional tests, ECU coding and DPF regeneration. If you mainly diagnose light and medium trucks and want to spend less, the MaxiDiag MD600CV delivers the same software family for roughly half…

To clear fault codes on Cummins INSITE, open the Fault Codes window, right-click, choose Refresh All Faults and click All. Only inactive codes will clear, and a key cycle is required afterwards.

INSITE Lite is the edition of Cummins INSITE that covers diagnostics, live data and parameters - everything in Pro except calibration download. Here is what it does and how to get started.

J1939 vs J1708: Understanding the Two Diagnostic Protocols Every diesel technician eventually encounters both J1939 and J1708 protocols when connecting diagnostic software to an engine. These are the two data communication standards that define how your laptop talks to the engine ECM. J1939 is the modern high-speed CAN (Controller Area Network) protocol used on virtually all diesel engines manufactured after 2007. J1708 is the older, slower serial protocol used on engines from roughly 1996 to 2007. Understanding the…

CAT ET vs Cummins Insite: Why You Need Both If you run a mixed fleet or independent repair shop, you will eventually face the CAT ET vs Cummins Insite decision. The blunt answer is: you need both. These are not competing products — they are brand-specific dealer tools built for entirely different engine ecosystems. CAT ET talks to Caterpillar ECMs; Cummins INSITE talks to Cummins ECMs. Neither software can fully diagnose the other's engines. However, there are real differences in cost, learning curve, adapter compatibility,…

What Is Engine Fault Code P0087? P0087 is a generic OBD-II diagnostic trouble code defined as "Fuel Rail/System Pressure — Too Low." On diesel engines, this means the ECM (Engine Control Module) has detected that actual fuel rail pressure is falling below the commanded target pressure by a significant margin. The threshold for setting P0087 varies by manufacturer, but typically triggers when actual rail pressure drops more than 10-15% below target for more than 2-3 seconds. This is one of the most common diesel fault codes…

Why Bucket Tooth Type Matters Choosing the wrong bucket tooth type is the most expensive $5 mistake you can make on a job site. A standard tooth in granite quarry work will wear to the adapter in 50 hours; a rock tooth in soft clay will increase fuel consumption by 15% due to unnecessary penetration resistance. Matching the tooth profile to your primary material is the single most impactful decision for bucket efficiency and operating cost. This guide breaks down every major tooth type, system, and material grade so you can…

When to Replace Bucket Teeth: Signs of Wear Bucket teeth are the primary wear component on excavator, loader, and backhoe buckets. Operating with worn teeth reduces digging efficiency by up to 40% — your machine has to work harder to penetrate material, burning more fuel and stressing the bucket structure. Replace bucket teeth when the wear reaches the adapter nose (the metal boss the tooth mounts onto), or when the tooth tip has worn back more than 50% from its original length. Other signs include: visibly rounded or blunt…

Understanding Cummins Fault Codes: SPN and FMI Explained Cummins engines use the SAE J1939 standard for diagnostic trouble codes, which uses two components: SPN (Suspect Parameter Number) identifies which component or system has a fault, and FMI (Failure Mode Identifier) describes the type of failure detected. For example, SPN 94 FMI 1 means "Fuel Delivery Pressure — Data Valid But Below Normal." Understanding this two-part structure is essential for accurate diagnosis — reading just the SPN without the FMI leads to…

Download and install Cummins INSITE software step-by-step guide 2026. Complete setup for diesel diagnostic, fault code reading, and ECM programming. Compatible with Windows 10/11. Includes adapter setup and activation tips.