Jaltest Commercial Vehicles

Jaltest Commercial Vehicle Diagnostics

If your shop or fleet operation touches anything with air brakes, a J1939 data bus, or a diesel particulate filter, this is the diagnostic platform that replaces the stack of brand-specific tools collecting dust on your bench. Jaltest commercial vehicle diagnostics cover 214 manufacturers, 6,067 models, 29,596 technical data entries, and 30,695 interactive wiring diagrams — all accessible from a single interface, updated three times per year to keep pace with new model releases and ECU revisions.

Diesel Truck Diagnostic Tools has been an authorized Jaltest and Cojali dealer since 2016. We do not just sell this platform — we support it. Every call to 800-217-0063 connects you with a trained staff who has used Jaltest in a working shop, not a call center reading from a script.

Four Segments, One Platform

Jaltest organizes commercial vehicle coverage into four subcategories. Each one can be licensed individually or bundled into a full commercial vehicle package, depending on what rolls through your bays.

Trucks

Class 3 through Class 8 on-road commercial vehicles. Covers 32+ manufacturers including every major North American brand — Freightliner, Kenworth, Peterbilt, Mack, Volvo, International, and Western Star — plus European makes like DAF, MAN, Mercedes-Benz, Scania, and Renault Trucks. Full system access to engines (Cummins, Detroit, PACCAR MX, Navistar), transmissions (Allison, Eaton, ZF), braking systems (Bendix, Wabco, Meritor), and every electronic module on the truck.

Buses

Transit buses, school buses, motorcoaches, and the growing electric bus segment. Covers 21+ manufacturers including Blue Bird, Gillig, New Flyer, Prevost, Van Hool, and electric platforms from BYD and Mercedes-Benz Ecitaro. Built for transit agencies, school districts, and charter operators who need full system diagnostics without relying on a single OEM dealer.

Trailers

EBS, ABS, air suspension, refrigeration units, lighting modules, and tire pressure monitoring systems. Covers trailer-specific component manufacturers — Bendix, Haldex, Knorr-Bremse, Wabco — plus refrigeration diagnostics for Carrier and ThermoKing units. Critical for DOT compliance, brake inspections, and reefer temperature chain integrity.

Light Commercial Vehicles

Vans, pickup trucks, chassis cabs, and panel vans from 22+ manufacturers. Covers Ford Transit, Mercedes-Benz Sprinter, Volkswagen Crafter/Transporter, Renault Master, Iveco Daily, and dozens more. Ideal for delivery fleets, last-mile logistics companies, service vehicle operators, and municipal fleets running mixed-make LCV inventories.

Diagnostic Capabilities — What Jaltest Actually Does

This is not a code reader. Jaltest provides OEM-level diagnostic depth across every system on the vehicle. Here is what that means in practice:

Fault Code Management

  • Automatic system detection — connect to the vehicle and Jaltest identifies every electronic module on the network, reads fault codes from all systems simultaneously, and presents them in a unified view
  • Active and stored fault codes — read, interpret, and clear DTCs across engine, transmission, ABS, body controller, aftertreatment, HVAC, instrument cluster, and every other networked module
  • Freeze frame data — capture the operating conditions present when a fault occurred, giving you context beyond just a code number

Real-Time Data Monitoring

  • Live sensor data — monitor temperatures, pressures, voltages, RPM, fuel rates, boost pressure, EGR position, turbo speed, and hundreds of other parameters in real time
  • Multi-system data display — view data from multiple ECUs simultaneously, so you can correlate engine behavior with transmission response or aftertreatment system inputs
  • Data recording and playback — record live data streams during road tests or intermittent fault chasing, then play them back at your bench for analysis

Bi-Directional Testing and Actuator Commands

  • Actuator activation — command individual components on and off: injectors, EGR valves, VGT actuators, cooling fans, glow plugs, brake valves, and dozens more
  • Cylinder cut-out tests — isolate individual cylinders to identify misfires, weak injectors, or compression problems without tearing into the engine
  • Component testing — drive outputs to verify wiring and component function before replacing parts, reducing comebacks and unnecessary part swaps
  • Over 50,000 dealer-level commands — the same active tests and special functions available at the OEM dealer service department

Aftertreatment and Emissions Service

  • DPF regeneration — initiate both static (parked) and dynamic (driving) regeneration cycles, monitor soot and ash loading levels, and reset regeneration counters
  • SCR system diagnostics — test DEF dosing systems, NOx sensors, DEF quality sensors, SCR catalyst efficiency, and urea injector operation
  • DOC and EGR diagnostics — monitor diesel oxidation catalyst performance, EGR valve position and flow, EGR cooler efficiency, and related sensor inputs
  • Soot and ash level resets — clear accumulated soot and ash counters after DPF cleaning or replacement

ECU Programming and Calibrations

  • Injector coding — program new injector correction codes (IQA/QR codes) after injector replacement on Cummins, Detroit, PACCAR, and other platforms
  • ECU reprogramming and parameter modification — adjust vehicle speed limiters, idle shutdown timers, PTO configurations, fan engagement temperatures, and dozens of other programmable parameters
  • Clutch calibrations — perform automated clutch teach-in procedures on Eaton automated manual transmissions, ZF TraXon, and other AMT platforms
  • Sensor and actuator calibration — zero-point calibrations for steering angle sensors, accelerometer calibrations for roll stability systems, and position learn procedures for throttle bodies and EGR valves
  • Component replacement registration — register new control modules, sensors, and actuators to the vehicle network after replacement, ensuring the new part communicates correctly with other systems

Guided Diagnostics and Technical Information

  • Guided troubleshooting — step-by-step diagnostic procedures tied to specific fault codes, walking you through the manufacturer-recommended diagnostic path with test points, specifications, and expected values
  • Interactive wiring diagrams — 30,695 wiring schematics with clickable components, connector pinouts, wire colors, and circuit routing. Click a sensor in the diagram and Jaltest highlights the complete circuit from the ECU pin to the component
  • Maintenance schedules — manufacturer-recommended service intervals for oil changes, filter replacements, fluid changes, and system inspections
  • Standard repair times — labor time estimates for common repair procedures, useful for quoting jobs and managing workflow

Systems Covered

Jaltest does not just read the engine. It accesses every electronic system on the vehicle. Here is the full list:

System Category Specific Coverage
Engine Cummins (ISB, ISC, ISL, ISX, X12, X15, B6.7, L9), Detroit Diesel (DD13, DD15, DD16, Series 60), PACCAR (MX-11, MX-13), Navistar (A26, N9, N13), Volvo (D11, D13, D16), Caterpillar (C7, C9, C13, C15), MTU, Perkins
Transmission Allison (1000/2000/3000/4000 Series, TC10), Eaton (Fuller, UltraShift, Endurant), Volvo I-Shift, Detroit DT12, ZF (TraXon, AS-Tronic, EcoLife), Voith DIWA
ABS / Braking Bendix (EC-60, EC-80, Wingman), Wabco (VCSII, SmartTrac), Meritor WABCO, Knorr-Bremse (EBS, ABS), Haldex (EB+, ABS)
Instrument Cluster OEM clusters for all supported makes — gauge calibration, warning light configuration, trip data reset
Body Controller (BCM) Lighting circuits, wiper controls, door locks, power windows, mirror adjustments, accessory circuits
HVAC Climate control, blend door actuators, A/C compressor engagement, cabin temperature sensors, heater valve operation
Exhaust Aftertreatment DPF, DOC, SCR, DEF dosing, NOx sensors, soot sensors, ash accumulators, EGR cooler monitoring
Suspension Air suspension leveling, ride height calibration, shock absorber monitoring, load leveling systems
Steering Power steering systems, steering angle sensor calibration, electronic stability control integration
Lighting Headlamp aiming, LED driver modules, marker lamp circuits, turn signal programming, trailer lighting interface
Telematics OEM telematics modules, GPS antenna diagnostics, cellular modem status, remote diagnostics interfaces
Auxiliary Systems PTO (power take-off) engagement and configuration, hydraulic pump controls, aerial platform interfaces, refuse body controls
Heating Systems Webasto and Eberspacher fuel-fired heaters — diagnostics, fault codes, glow plug testing, combustion monitoring, timer programming

Component Manufacturer Coverage

Beyond the vehicle OEMs, Jaltest provides direct diagnostic access to the component manufacturers whose systems are integrated across multiple truck, bus, and trailer platforms. This means you do not need a separate tool for Allison transmissions or Bendix brakes — Jaltest covers them natively.

Manufacturer Primary Systems
Allison Transmission Automatic transmissions (1000-4000 Series, TC10), TCM programming, clutch pack adaptation
Bendix ABS, stability control (ESP), air dryer diagnostics, Wingman ACB, Fusion camera system
Bosch Fuel injection systems, EDC units, common rail diagnostics, ABS modules
Caterpillar Engine ECM diagnostics (C-series), legacy truck engine support
Continental Tire pressure monitoring, instrument clusters, VDO tachograph interfaces
Cummins Engine ECM (ISB through X15), aftertreatment systems, INSITE-level diagnostics
Detroit Diesel Engine ECM (DD13/DD15/DD16), DT12 transmission, Detroit Assurance safety systems
Eaton Automated manual transmissions (UltraShift, Endurant), hybrid systems, clutch actuators
Haldex Trailer EBS, ABS, air suspension (ECAS), automatic brake adjusters
Knorr-Bremse Trailer and truck EBS/ABS, TEBS (Trailer EBS), compressor diagnostics, air dryer service
Meritor WABCO ABS, drivetrain diagnostics, differential lock controls
MTU Engine diagnostics for MTU-powered applications (bus, specialty)
PACCAR MX-11 and MX-13 engine ECM, PACCAR proprietary body and chassis modules
Perkins Engine diagnostics for Perkins-powered commercial and industrial applications
Voith DIWA automatic transmissions, retarder diagnostics, turbo compound systems
Wabco ABS, EBS, ECAS air suspension, SmartBoard trailer monitoring, OptiTire TPMS
Webasto Fuel-fired coolant and air heaters, Thermo Top, Air Top, diagnostics and programming
ZF TraXon, AS-Tronic, EcoLife transmissions, steering systems, ZF Intarder retarder

Licensing Options

Jaltest commercial vehicle licensing is structured to match your shop workload. You do not have to pay for bus coverage if you never see a bus. Here are the available options:

  • Full Commercial Vehicle License — everything: trucks, buses, trailers, and light commercial vehicles. One license, complete coverage. Best value for multi-segment shops and large fleets.
  • Modular Truck License — all truck manufacturers and related component systems (engines, transmissions, braking, aftertreatment). Ideal for shops focused exclusively on Class 3-8 on-road trucks.
  • Modular Trailer License — trailer EBS, ABS, ECAS, refrigeration, lighting, and TPMS diagnostics. Purpose-built for trailer service facilities and reefer shops.
  • Modular Bus License — transit, school, coach, and electric bus manufacturers with all related systems. Designed for transit agencies, school bus fleets, and coach operators.
  • Truck Select License — pick specific truck brands you work on most. A cost-effective entry point for shops that specialize in a handful of makes.

Not sure which license fits? Call us. We will ask about your typical workload, the makes and models that come through your shop, and recommend the license tier that covers your needs without paying for coverage you will never use.

Why One Platform Instead of Five Separate Tools

Most shops that work on multiple truck brands end up with a graveyard of brand-specific diagnostic tools. A Cummins INSITE license here, a Detroit DDDL subscription there, a separate ABS tool for Bendix, another for Wabco. Each one has its own laptop requirement, its own software update schedule, its own annual subscription fee, and its own learning curve.

Jaltest replaces that entire stack. One interface. One update schedule (three times per year). One subscription. One set of cables. One tool your techs need to learn. When a Freightliner with a Cummins engine, Allison transmission, and Bendix ABS rolls in, your technician connects once and has full access to every system — no swapping tools, no switching laptops, no remembering which software handles which module.

The math is straightforward. Add up what you spend annually on brand-specific tool subscriptions, update fees, and the productivity lost to tool-switching. For most shops working on three or more truck brands, Jaltest pays for itself within the first year.

Updates and Coverage Growth

Jaltest releases three major software updates per year, each one adding new manufacturer coverage, new model year support, new diagnostic functions, and new wiring diagrams. The 29,596 technical data entries and 30,695 wiring diagrams in the current release represent the largest update library of any commercial vehicle diagnostic platform available.

When a manufacturer releases a new ECU calibration or a new model variant hits the road, Jaltest engineering adds coverage and pushes it out in the next release cycle. You are not waiting years for support — you are typically months behind the factory tool at most, and in many cases Jaltest has coverage at the same time as or before some OEM tools add features.

Free Shipping, Full Warranty, Live Support

Every Jaltest kit ships free to anywhere in the continental United States. Every kit carries the full manufacturer warranty plus our 30-day satisfaction guarantee. And every customer gets unlimited access to our trained-staff phone support team at 800-217-0063.

We are not a marketplace or a dropshipper. Diesel Truck Diagnostic Tools has been an authorized Cojali/Jaltest dealer since 2016. We stock inventory, we configure kits, we provide training, and we answer the phone when you need help diagnosing a vehicle at 7 AM on a Monday morning.

Get Started

Browse the commercial vehicle diagnostic kits below, or narrow your search by subcategory:

Not sure which kit or license is right for your operation? Call 800-217-0063 or email support@dieseltruckdiagnostictools.com. Our trained staff will walk you through the options and recommend the right fit for your shop, your fleet, and your budget.