device and allows any J compliant PassThru device to connect to any vehicle network. PassThru Device Physical and Data Link Layer Protocol Support . J Recommended Practice for Pass-Thru Vehicle Programming Last Protocols Supported by a fully compliant SAE J Device. PassThru+ XS 2G is the only device fully compliant to J & J Recommended and tested by major OEM’s, the PassThru+ XS 2G device is a VCI .

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PassThru+ XS 2G & SAE J2534 protocol

The maximum prottocol current to be supported by the interface is mA. A device alone is not enough to reprogram the ECU’s. This protocol can be used to handle any custom CAN messaging protocol, including custom flow control mechanisms.

Each protocol has different voltage and timing requirements, so this is no trivial task. J pass-thru reprogramming is only required for emissions based ECUs eg.

This software application can be delivered on Internet or on a CD according to the manufacturer. The Software The EPA is forcing car manufacturers to release software that updates the firmware on their cars. The programming time varies among vehicles based on communication j2354 of the protocol used, calibration file size, total number of calibration files, the number of ECUs to reprogram, and Internet connection latter is dependent on OEM.

This interface also includes some capabilities that may not be required for reprogramming, but allows the interface to be used for other purposes without placing a significant burden on the interface manufacturers.


Fortunately, each device comes with a software driver that implements the J API. Each protocol has different voltage and timing requirements.

Softing Automotive – PassThru (SAE J)

The inventor of electronic diagnostics and a pioneer in the field of vehicle architecture, particularly multiplexed architecture, ACTIA innovates across its skills spectrum to stand out from the crowd, remain independent and maintain its leading position in the field. It is sometimes necessary to reprogram ECU’s to regulate and repair cars equipped prtoocol OBD systems which are do not conform with pollution emission values.

No multi-frame messages can be transmitted without matching a flow control filter.

Our experience and our expertise in the automotive and aeronautics sectors mean that our hardware and software designs provide a high level of quality. In a similar vein, the J API makes all “car communications” hardware look the same. Note that a fee set by the OEM may apply. A device requires a Windows-based PC on which the reprogramming application software operateswith a USB or Ethernet port, and an internet connection for Internet access to obtain reprogramming application software and calibration files.

The actual number of messages returned is in NumMsgs. Newer vehicles with CAN protocol may be as fast as 2 minutes, while vehicles with CAN that have a lot of data to download will take well over an hour.

A J compliant device for ECU reprogramming is considered a vehicle interface. High-speed Internet connection is highly recommended. What is J and J? Where do I get the ECU reprogramming calibrations from?

There’s a special ACTIA service for each of our products, systems and solutions that answers our customers’ needs closely. More than a requirement, quality is one of the ACTIA group’s true values, and is shared by all its employees in j25344 certified environment.


You will be required to download the calibration files directly from the OEM websites, so shorter downloads equate to quicker reprogram times.

Anyone can buy this software, even individual car enthusiasts.

If the ISO checksum is verified by the interface, and the checksum is incorrect, the message will be discarded. Even though each printer has different hardware. The default bus idle period before the interface shall transmit an address, shall be ms. The baud rate shall be set by the application, not determined by the SAE J interface. Yes, J reprogramming application software typically does not incorporate diagnostic Scan Tool functions that must be utilized to perform post-reprogramming tasks such as clear DTCs or re-learn procedures.

The application is required to handle any special timing requirements based on receipt of this response code, including stopping any periodic messages. If ECU reprogramming is practiced in the dealership, then it is the responsibility of each OEM to maintain and update their own sites, and keep current calibrations available for download.

In addition, the following specifications clarify and, if in conflict with ISOoverride any related specifications in ISO Support odd and even parity in addition to the default of no parity, with seven or eight data bits. There is no published standard yet. SAE J defines optional features that takes advantage of the J framework.