Knock control with uS and MS-Seq

[cmonref]

Is knock control available with a uS or the Sequencer like it is in MS-II?

For MS-II, the Manual describes how to connect a jumper to JS-4 that ends up at PAD07 on CPU pin #34 which is labeled as AD-7. It appears that that same CPU pin in uS and Seq are also AD-7 but they come out onto the board in a different manner than the MS-II. The schematics for both uS and Seq show AD-7 being on pin #5 on uS and on Seq's Green connector. But wiring charts for both uS and Seq show that same pin #5 as not used.

The same codebase is used for MS-II and uS (and I presume the Seq) and that codebase can handle knock when run on MS-II, so I presume the code can also handle knock when run on uS (and presumably the Seq).

For uS, there is a comprehensive description of features that are available in MS-II but are NOT available in uS. That description is silent on knock -- it is not mentioned as "still available" nor as "no longer available."

Will the uS and Sequencer handle knock the same way as MS-II, thru the uS and Sequencer's version of MS-II's "connect a jumper to JS-4 ..." then set the knock variables in Megatune?

Brian

[grippo]

Yes both microsquirt and sequencer will handle a knock sensor with the same code as in MS2. The wiring charts may be incorrect because ADC-7 is definitely used and is brought out on pin 5.

[cmonref]

Thanks, Al. So using knock sensing in uS and Sequencer is accomplished by connecting the output from whatever knock control circuitry you are using to pin #5, and setting variables in Megatune? I'm a little surprised that this is not mentioned in the Manual (at least _I_ did not find it) and that the error in the wiring charts has not been discovered in the years since uS came out.

Brian

[Mitsuhiko]

Well, May be it is a MegaTune or firm ware issue, but uS can't handle knock pin when I test it.
The wire of 5 pin at uS is labeled as 'MAF' but I couldn't configure 'MAF on knock pin'.
Also uS couldn't configure as 6 Cyl. wasted spark with using D15 and D16 by MS2-extra.

That's means you should carefully reserch the code conpatibility with MS2 before purchase the uS or uS-Seq.

[cmonref]

Mitsuhiko,

In finding an answer to your post, I also found an answer to mine. From the Manual under Microsquirt MAF and MAF/MAP Blend:

When the MAF option is selected, the sensor would normally be wired to the MAP pin. If, however, the combined MAF/ MAP option is selected, then MAF MUST be connected to the Barometric/second EGO sensor pin (#29) (you cannot use the knock pin with a MicroSquirt® EFI controller, it is not brought out to the AMPseal connector on MicroSquirt®).

Apparently the "knock pin" (#5 on the uS Ampseal?) is not used and the witing chart is right.

Brian

[Mitsuhiko]

Apparently the "knock pin" (#5 on the uS Ampseal?) is not used and the witing chart is right.

Brian

When I input 5V to #5 on the uS Ampseal ( yes Ampseal has #5 as labeled "MAF") knock voltage will be 0V to 1.3V in Realtime Display of the Tuner Studio. Also if I configure to "MAF on knock pin", The MAF gauge will be 0g/sec to 1g/sec.
That is the reason why I thought #5 pin is connected to knock pin and that is software issue.

[cmonref]

I'm way over my lil' head now. Al says that AD-7 comes out on pin #5, AD-7 is what MS-II uses for knock, the Manual says to connect MAF to the MAP pin #24 or to pin #29 if MAF/MAP blend is used. I'm gonna bet on Al and conclude that pin #5 on uS and Sequencer can be used for knock.

And I'm gonna keep reading ...

Brian

[Mitsuhiko]

I found that Hardware schematics for uS was updated and #5 pin is connecting to AD07.
http://www.microsquirt.info/us_hardware.htm


But, I can't control knock with V2.89 code+JimStim .. I hope it will be support near future.

[grippo]

The problem may have been that the first version of microsquirt (red pcb board) didn't have the last ADC connected to an outside pin. But the green pcb definitely is. I will check the knock sensor operation in the next day or two.

[grippo]

The knock sensor code does work in microsquirt and sequencer, but if your microsquirt is vsn 1 (red pcb) there is no connection from ADC7 to the Ampseal.