SAE J2237 outlines recommended minimum guidelines for remanufacturing heavy-duty starters to promote consistent reliability, durability, and safety. Although this standard was designated as non-current in 2008, its procedures remain a valuable reference for remanufacturers and technicians seeking to restore starter…

The SAE J2202-2024 recommended practice provides essential guidelines for material selection, construction, and qualification of primary wiring systems in heavy-duty on-highway trucks. This standard, reaffirmed in January 2024, focuses on nominal 12 VDC and/or 24 VDC systems and covers cable…

For engineers and designers working with helical springs, a clear understanding of terminology and manufacturing processes is essential for creating reliable specifications and achieving desired performance. SAE J1121, “Helical Compression and Extension Spring Terminology,” provides a foundation for communication between…

Engine cooling fans in heavy-duty vehicles are increasingly shifting from traditional metallic designs to advanced nonmetallic materials. SAE J1474-2012 provided critical information on material selection, manufacturing techniques, and validation testing for these fans. Although the standard was cancelled in 2012…

Ensuring that diagnostic communication between scan tools and heavy-duty vehicle ECUs meets rigorous regulatory requirements is essential for on-board diagnostics (OBD) compliance. The SAE J1939-84-2023 standard provides a comprehensive, structured test framework to verify that SAE J1939 diagnostic message exchanges—over…

The Heavy-Duty OBD IUMPR Data Collection Tool Process, defined by SAE Information Report J3162 (2024), provides a standardized software approach for collecting In-Use Monitor Performance Ratio (IUMPR) data from heavy-duty (HD) vehicles. This tool is essential for meeting the requirements…

As heavy-duty trucks and buses transition from purely mechanical linkages to sophisticated electronic “drive-by-wire” systems, the need for clear prioritization of operator control inputs becomes critical. SAE J3081-2020 provides criteria and rationale for resolving conflicting control requests to maintain vehicle…

This article provides a practical overview of SAE J2728-1-2020, which defines a minimum set of data elements and heavy vehicle–specific triggers for event data recording. Engineers designing or integrating HVEDR systems will find guidance on trigger configurations, data formatting, and…

⚠️ Important Notice: SAE J2244/2 was cancelled in December 2007 and superseded by ISO 6149-2. For new designs, refer to the current ISO standard. This article is provided for reference and compatibility assessment with existing systems. 1. Scope and Standard…

SAE J1498-2017 provides standardized procedures for determining the heat of combustion (heating value) of fuels used in automotive engines. This guide summarizes key aspects for engineers working with fuel calorimetry, unit conversions, and blended fuel calculations. 🛠️ Engineering Insight: Heating…

Scope and Performance Requirements SAE J2695-2005, developed cooperatively by SAE, ASTM, and NLGI, is a recommended practice that aids engineers in designing heavy duty vehicle components and selecting appropriate greases. The standard defines a lubricating grease as a solid to…

The SAE J2425 recommended practice provides a comprehensive laboratory test procedure and requirements for evaluating heavy-truck steering control systems. Revised in 2021, this standard incorporates acceptance criteria from FMVSS 203 and CMVSR 203, adding a critical quasi-static force requirement that…

SAE J975, originally issued in 1967 and cancelled in May 2009, defines performance and design requirements for headlamps used on agricultural equipment that may travel on public roads. Although superseded by ASABE S608, this standard remains a valuable reference for…

Heated seats offer comfort, especially in cold climates, but they also present a risk of low-temperature burns if not properly controlled. SAE J3047-2020 provides a recommended practice to mitigate this risk, offering engineers a framework based on established burn research.…

Headlamp aiming devices are essential tools for ensuring that mechanically aimable headlamp units are adjusted correctly for both vertical and lateral aim. SAE J602-2011 establishes the requirements and laboratory test procedures to verify the performance and durability of these devices.…

SAE J1606-2011 provides essential guidelines for designing headlamps that address the visual challenges of older drivers. As the driving population ages, incorporating these considerations into automotive lighting systems becomes critical for safety. This article covers age-related vision changes, their implications…

Background and Rationale: The Growing Problem of Mirror Glare In the late 1990s, increased popularity of sport utility vehicles (SUVs) and pickup trucks led to rising public dissatisfaction with glare from high-mounted headlamps. NHTSA received numerous complaints regarding both rear…