PCM Hammer Release 021

[vwnut8392]

was wondering if it is possible to use scanmatik 2 pro cable works with PCMhammer? it appears to be capable with the J2534 protocol. here's a link to it so you guys can check this cable out. https://scanmatik.pro/products/scanmatik-2-pro

[antus]

Its not possible to say without trying it. Most J2534 tools work, but some are a bit glitchy or limited and do not. It says it does support J1850 VPW which is the needed protocol.

[vwnut8392]

Here are logs from PCMhammer when i tried scanmatik SM2 pro.

[antus]

It looks like it does not support VPW 4x mode. Everything looks good until the speed switches up, then there is no more response. So something is going wrong with the communications. Try unticking use 4x in the device settings page to run at 1x speed. It'll be 1/4 of the speed, but it might work.

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[01:21:01:371]  Attempting switch to VPW 4x
[01:21:01:377]  TX: 6C FE F0 A0
[01:21:01:389]  RX: 6C F0 10 E0 AA
[01:21:01:390]  Parsing 6C F0 10 E0 AA
[01:21:01:395]  Module 0x10 (engine controller) has agreed to enter high-speed mode.

After this point there is no more RX which means nothing is being received back. So either the device isnt able to transmit any more, or it cant listen at 4x. Likely both.

[vwnut8392]

It looks like it does not support VPW 4x mode. Everything looks good until the speed switches up, then there is no more response. So something is going wrong with the communications. Try unticking use 4x in the device settings page to run at 1x speed. It'll be 1/4 of the speed, but it might work.

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[01:21:01:371]  Attempting switch to VPW 4x
[01:21:01:377]  TX: 6C FE F0 A0
[01:21:01:389]  RX: 6C F0 10 E0 AA
[01:21:01:390]  Parsing 6C F0 10 E0 AA
[01:21:01:395]  Module 0x10 (engine controller) has agreed to enter high-speed mode.

After this point there is no more RX which means nothing is being received back. So either the device isnt able to transmit any more, or it cant listen at 4x. Likely both.

i did try that. the logs are also posted above. they are labeled 4x disabled.

[kur4o]

i did try that. the logs are also posted above. they are labeled 4x disabled.

It can`t process longer messages. You can try sending smaller size to find what is the limit of the tool, It is capped at 13 bytes, you`d better request a firmware update, since the tool doesn`t fit the j2534 standard.

[vwnut8392]

i did try that. the logs are also posted above. they are labeled 4x disabled.

It can`t process longer messages. You can try sending smaller size to find what is the limit of the tool, It is capped at 13 bytes, you`d better request a firmware update, since the tool doesn`t fit the j2534 standard.

not really sure how i would convey this to the people at scanmatik. any suggestions?

[antus]

There isn't a way to set that as a configuration item You'd need to go full developer style and download the source code and change the limit built in to the app and recompile it.

[Gampy]

I agree it does not conform to the standard, and it does not support 4x.

I do not know the exact wording of the J2534 J1850VPW buffer size specification off the top of my head, but the specification size is: 4128 bytes.

So their VCI does not meet the J2534 J1850VPW specification, or even the J2534 specification which I believe is the same size.

If you have MS Visual Studio 2017/2019 installed (it's free), it's simple to build PCMHammer, just use the Kernels out of a release and copy them to the Apps\PcmHammer\bin\Debug directory, then reduce the MaxSendSize and MaxReceiveSize here: J2534 Packet sizing, build and test ... Wash and repeat until you find it's max capabilities.

It's probably not worth the hassle, or even wasting your time communicating with them ... They likely know, they likely don't care!

That is a lot of money for a non-compliant J2534 VCI ...

-Enjoy

[antus]

The J2534 2002 revision specification says in section 6.5.4:

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6.5.4 SAE J1850 10.4 KBPS VPW (Variable Pulse Width) - the following additional features of SAE J1850 must be supported by the pass-thru device for 10.4 kbps VPW:
  a. High speed mode of 41.6 kbps
  b. 4K block transfer