Jaltest (JDC402A) | Volkswagen 2+2-pin OBD1 - 16-pin OBD2 Adapter Cable | Delivery van
Warranty directly via AsTools
Warranty directly via AsTools
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2 years warranty on all products
2 years warranty on all products
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Easy returns
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Professional customer service
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The Jaltest JDC402A is the diagnostic cable that connects the proprietary 2+2-pin connector of Volkswagen commercial vehicles to the Jaltest Link: Two separate connectors that together form the diagnostic lines and are located in the cab, at the dashboard or center console. On the interface side is the 16-pin OBD2 connector for your Jaltest diagnostic cable.
Once the connection is established, the Jaltest software accesses the individual control units of the commercial vehicle: The diesel control EDC, the hydraulic ABS, the airbag system Airbag 3 (SRS), the automatic transmission TU, the Immobiliser with the comfort system CS, the instrument cluster, the auxiliary heater, and the four-wheel drive of syncro versions. Which of these are present depends on the engine type and equipment: On the earliest versions with mechanically controlled diesel engines, the EDC control unit is absent. The cable falls under Jaltest CV (commercial vehicles).
KEY FEATURES
IMPORTANT NOTES
Applications and functionality
Through this connection, you access the control units of the commercial vehicle using Jaltest software. The units listed below are from the Volkswagen coverage of the T4 generation; which ones are present depends on the engine type and equipment.
Control units you can access
- EDC, Electronic Diesel Control: The electronic diesel control system.
- ABS, Anti-lock hydraulic braking system: The anti-lock braking system.
- Airbag 3, Supplemental Restraint System: The airbag and seat belt tensioning system.
- TU, Automatic transmission: The automatic gearbox.
- Immobiliser and CS, Comfort system: Engine immobilizer and comfort system, with the door modules LDM and RDM.
- INS 1.0, Instrument cluster and CU 1.0, Auxiliary heater: Instrument panel and auxiliary heater.
- AWD, Four-wheel Drive: Four-wheel drive on Syncro models.
What you can do
- Read and clear fault codes: Access the control unit's fault memory with detailed descriptions of detected faults.
- View live data: Monitor real-time sensor values connected to the control unit in both numeric and graphical formats.
- Activate components: Directly trigger components to determine whether the fault lies with the part itself or in the wiring.
- Configure settings: Write configurations and parameters to the control unit.
- Perform calibrations: For systems where Jaltest offers calibration procedures, such as after component replacement.
Compatible vehicles and applications
The connector type determines compatibility, not the model.The 2+2-pin connection is Volkswagen's proprietary diagnostic connector used through model year 1996, so it's found on early commercial vehicles. Check which connector is installed in your cab on-site.
Volkswagen:
- Transporter T4: (1990 - 1996)
- LT (1st generation): (1990 - 1996)
- Caddy II: (1995 - 1996)
Package contents
- 1x Jaltest (JDC402A) | Volkswagen 2+2-pin OBD1 - 16-pin OBD2 Adapter Cable | Commercial Vehicle
Technical specifications
| Specification | Description |
|---|---|
| Brand | Jaltest (Cojali) |
| Reference Number | JDC402A |
| Type | Adapter Cable |
| Application | Volkswagen commercial vehicles with 2+2-pin diagnostic connector |
| Vehicle-side Connection | 2+2-pin OBD1 |
| Interface-side Connection | 16-pin OBD2 |
| Control Units | ECU (engine), ABS, Airbag 3 (SRS, TU (automatic transmission), Immobilizer, CS with LDM and RDM, INS 1.0, CU 1.0 and AWD |
| Segment | Commercial Vehicle |
| Jaltest Module | Jaltest CV (commercial vehicles) |
| Required to Use | Jaltest Link with valid software license |

To ensure you always have access to the latest software updates and releases for your Jaltest device, it's important that you register the correct distributor.
Only the authorized distributor can perform new software installations and updates. When you designate us as your distributor, we can handle this for you and guarantee that your device stays current and runs smoothly.
How does it work?
-
Download and complete the change form
You can find the form as a PDF file here. -
Send us the completed form
You can easily do this by email to support@astools.eu. -
We'll take care of the rest
With the form, we can notify Jaltest of the change and officially register you as our customer.






