Jaltest Trailer Diagnostic Tool

The Jaltest Trailer module is a leading multi-brand and multi-system diagnostic platform, specifically developed for the complex electronics of trailers and semi-trailers. The system is designed for full diagnosis of components such as the electronic braking system (EBS), the electronic air suspension system (ECAS), and other control units that are standard on modern trailers. The solution consists of the robust, wireless Jaltest Link VCI combined with the powerful Jaltest SOFT diagnostic software.

What sets Jaltest apart is the integration of diagnosis, technical information, and repair guidance in one platform. The technician is actively supported in every phase of the workshop process – from analyzing an EBS fault to the calibration after repair – all within one intuitive and user-friendly interface. Jaltest Trailer is thus the ideal diagnostic partner for any workshop specialized in trailer maintenance.

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Diagnostic functions:

The Jaltest Trailer module offers extensive, brand-independent OE-level diagnosis for all electronic systems present on modern trailers and semi-trailers. The focus is on safety systems such as EBS and ECAS, but also on other control modules.

• Reading and clearing fault codes: Detects active, inactive, and permanent fault codes within systems such as EBS and air suspension (ECAS). Fault codes can be cleared immediately after repair.
• Live data monitoring: Displays real-time sensor values and system parameters, including air spring pressure, brake pressure per wheel, wear indicators and wheel speeds. Users can create custom lists with parameters displayed numerically or graphically.
• Actuator testing: Enables direct control of components such as EBS modulators, brake force distributors and solenoid valves, for functional real-time checking.
• System and ECU information: Provides access to the identification data of trailer control modules, including part number, serial number and software version of the EBS ECU

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Maintenance, service & calibration functions:

The Jaltest Trailer module offers a wide and in-depth range of maintenance, service, and calibration procedures for trailers and semi-trailers. These functions are equal to – and in many cases more extensive than – the capabilities of original dealer equipment. They enable technicians to independently perform complete repair processes from diagnosis to final check according to OEM specifications.

Electronic braking system (EBS/ABS) service:

The core of trailer diagnostics. Full support for systems from Wabco, Knorr-Bremse and Haldex:

• EBS modulator programming & replacement: Guided procedure for replacing the modulator. The software copies all parameters from the old unit and writes them to the new one.
• EBS Parameter Setting: Adjusting crucial vehicle parameters such as:
  • Tire size and circumference
  • Axle load distribution and center of gravity
  • Brake calculation based on entered values
  • Activation/deactivation of functions such as Roll Stability Support (RSS)
• Brake system checks: Performing guided tests, including:
  • Automatic brake actuator check per wheel
  • Brake cylinder pressure test

• Brake pad wear reset: Calibrating the wear sensors after brake pad replacement.

Electronic air suspension (ECAS) service:

• Ride height calibration: Setting and calibrating of:
  • Normal driving height
  • Lift height and drop height
• Height sensor calibration: Precise adjustment after replacement of the sensor, valve block or ECU.
• Axle load calibration: Calibration of the axle load sensors for correct weight measurement and display.

General maintenance functions:

• Reset maintenance interval: If supported by the ECU, the service interval can be reset after performing maintenance.
• System voltage check: Real-time monitoring of the EBS ECU power supply voltage, crucial for stable operation and fault analysis.

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Advanced diagnosis & technical information:

The power of the Jaltest Trailer module lies not only in fault detection but in the direct integration of specialized technical information within the diagnostic tool. This makes the platform a complete technical partner for trailer maintenance and repair.

• Interactive electrical and pneumatic diagrams: Fully clickable and dynamic diagrams where components such as ABS sensors, EBS modulators, valves, fuses and wiring are directly linked to:
  • Function and operation explanations
  • Test procedures and nominal measurement values
  • Component photos and location descriptions
  • Pin-outs of connectors
• System technical data: Jaltest offers comprehensive digital documentation per trailer system, including:
  • Adjustment data for brake and air suspension systems
  • Pneumatic specifications, such as nominal system pressures
  • Component data, including the characteristics of pressure sensors, speed sensors, and EBS modulators
• Repair guides per fault code: When a fault code occurs, Jaltest generates a step-by-step repair manual, including wiring checks, pneumatic line inspections, component tests, and concrete solutions, tailored to the specific system.
• Symptom-based diagnosis: Even without fault codes, complaints such as "brakes sticking" or "trailer pulls to one side when braking" can be investigated through a guided diagnostic procedure with logical test sequencing.
• Technical bulletins and procedures: Access to technical bulletins issued by Jaltest, focused on technical bulletins, addressing common issues and repair recommendations for trailer systems.
• Maintenance data: Automatically generated manufacturer-specific maintenance schedules, with inspection points, service intervals, and parts lists.
• Service procedures: Detailed step-by-step instructions for performing maintenance tasks, including required components, values, and settings.

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Specialized software modules & extensions:

The Jaltest Trailer module is part of a modular ecosystem and can be expanded with specialized software and hardware, significantly increasing the efficiency and feature set within the workshop:

• Jaltest GRP (Garage Resource Planning): A fully integrated workshop management and CRM system, with which you manage customers and vehicles, schedule work orders, generate quotes and invoices, and synchronize diagnostic reports with work orders for a complete administration.
• Jaltest ETM (Electronic Test Module): External tester with which EBS or ABS modulators, trailer control units, wheel sensors (ABS/EBS inductive) and wear sensors can be individually controlled: ideal for isolating and checking electronic components.
• Jaltest Info Online: A comprehensive technical knowledge base with repair manuals, wiring diagrams, fault code explanations, technical bulletins and system adjustment data, integrated into the diagnostic environment.
• Knorr‑Bremse Diagnostics: (optional) Advanced diagnostic functionality for Knorr‑Bremse EBS systems, including both trailer and tractor head support, available as an additional subscription within the Jaltest software.

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Supported vehicle brands:

• Trailers: Bendix, Carrier, Chereau, Cojali, Dana, Haldex, Knorr-Bremse, Thermo King, Vigia, Wabco

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Package contents:

• Jaltest Link V9 Interface
• Jaltest 15 Pins DB15 - 16 Pins OBD2 Adapter Plug
• Jaltest 26 Pins DB26 Extension Cable
• Jaltest USB-A - USB-B
• Jaltest Multi-pin Kit
• Jaltest Storage Case (Compact)
• Jaltest Cigarette Lighter Adapter Cable

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License information:

The Jaltest Trailer module operates based on a annual software license that provides access to all trailer-specific diagnostic and maintenance functions within the Jaltest platform. This license includes:

• Three major software updates per year, with improved coverage for EBS, ECAS, and other trailer systems, including new functionalities and up-to-date technical information.
• Access to technical support, including assistance with activations, fault analysis, software updates, and system configurations.

Modular structure:

The Jaltest software is modularly expandable. In addition to trailers and semi-trailers, additional licenses can be activated for other vehicle categories, such as:

• Commercial vehicles (CV)
• Agricultural vehicles (AGV)
• Off-Highway machines (OHW)
• Material Handling Equipment (MHE)
• Maritime applications (Marine)

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Technical specifications