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Why Passthru ?

It is sometimes necessary to reprogram ECU's to regulate and repair cars
   equipped with OBD systems which are do not conform with pollution emission
   values.

Until now the ECU's reprogramming capabilities were integrated in OEM's
   specific diagnostic tools. A consumer had to rely on the car manufacturers
   dealership. Any non franchise dealership would have to invest several
   thousand dollars in obtaining specialised tools (one per Brand!) to be able to
   perform ECU reprogramming. This factor places the freelance dealership in a
   non competitive position which ultimately will impact a consumers' freedom of
   dealership choice.

Who does define the Passthru specification ?

If EPA (Environmental Protection Agency) has ordered for this reason, an
   SAE to define a norm called SAE J2534. This so called PASS THRU
   norm defines technically the protocols of communication which have
   to be supported by a standard vehicle communication interface in order
   to enable the flashing of the ECU's relevant for pollution emission.

What is defined in the Passthru specification ?

The protocols which have to be supported by a PASS THRU device
   in order to be fully compliant are:

- K-Line ISO 9141
- KWP 2000 ISO 14230-4
- SAE J1850 PWM
- SAE J1850 VPW
- CAN 2.0B ISO 11898
- CAN ISO 15765-4
- SCI SAE J2610

What do you need to execute a flashing of the ECU's?

A device alone is not enough to reprogram the ECU's. To do that,
   you have to get the software application from the car manufacturer.
   This software application can be delivered on Internet or on a CD
   according to the manufacturer. Some car manufacturers decided to
   check their application with PASS THRU hardware devices in order
   to assure the function of a device together with the software.
   We recommend you to check the compliance of a PASS THRU
   device and the recommendation of the car manufacturer before 
   purchase.

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