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Old 04-02-2010, 08:29 AM   #1
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Question @Ben/Matt (and all) - continuous knock-retard with DIYPNP

Hi - I suppose Ben and Matt are the specialists with this...

I just got my car up and running after the winter again. I still have a problem with the DIYPNP.

I connected my KnocksenseMS to the DIYPNP via the ADC2/JS5. All my settings are the same from my former MS2 install.

The Knocksense gives a steady 5V (something like 4.9x volt actually) which means no knock. The DIYPNP although sees knock all the time and retards to the maximum 10degree retard... (So I switched to disabled for now.)

As I said - the knocksense is giving my the right voltages - where in the DIYPNP could I measure voltages to check what is going wrong?

Thanks
Sven
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Old 04-02-2010, 09:05 AM   #2
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Sven,
There is a variable resistor on the knock input circuit, R6 I think it is. This resistor is a sensitivity adjust. I'm thinking it's set "too sensitive".
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Old 04-02-2010, 11:33 AM   #3
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Hi Ben,

I am using the knocksense MS which is not connected to the internal knock circuit at all - just wired directly to the ADC2. Does this internal R6 (No it's R26) anyway have an influence on the sensitivity?

Thanks, Greets
Sven
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Old 04-02-2010, 11:50 AM   #4
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Ok, check to be sure you don't have the knock enable jumper on, and check the voltage at ADC2 with the car running. Let me know what you find.
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Old 04-02-2010, 11:56 AM   #5
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Quote:
Originally Posted by Zaphod View Post
Hi Ben,

I am using the knocksense MS which is not connected to the internal knock circuit at all - just wired directly to the ADC2. Does this internal R6 (No it's R26) anyway have an influence on the sensitivity?

Thanks, Greets
Sven
Ah, sorry I completely whiffed on that one. Let's probe for output voltage on the knocksense itself, and make sure it's getting to ADC2.
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Old 04-02-2010, 01:45 PM   #6
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Strangely enough this afternoon I opened the DIYPNP again to check the connections the 537th time - as I did know before everything was connected as supposed - I enabled the knock option again in TS and the knock retard was gone... WTF?

I tested the voltages before and got 4.97 V at the knocksense and at ADC2.

I will definitely keep an eye on this...

Edit.
@Matt - no knock enable jumper set



Thanks, Greets
Sven
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Old 04-02-2010, 11:56 PM   #7
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Hmm... well next time when/if the ECU thinks there's knock, hit the pins with a multimeter.

Clever use of the proto area.
Almost makes me sad that the new boards don't have the second proto area under the module (we put a LM1815 based VR conditioner and some other goodies there instead).
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Old 04-06-2010, 03:20 PM   #8
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Hi,

had the problem again today - hit the output line from the KnocksenseMS to with a DVM and got steady ~5.00 V - that line is directly connected to the ADC2.

Now I had a look at the TS menu again:

The choice there is between

MS2 AD6/JS5
MS2 AD7/JS4

I have this set to MS2 AD6/JS5 - which should be the ADC2 afaik.

ADC1 is the input of my EGT gauge.

Any ideas or suggestions?
Thanks!
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Old 04-06-2010, 03:36 PM   #9
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lol
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Old 04-06-2010, 03:45 PM   #10
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Nice comment - but a reasonable reply would have helped me more...
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Old 04-06-2010, 04:18 PM   #11
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Next time this happens, check for 5V on pin 16 of the microsquirt module.
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Old 04-08-2010, 04:27 PM   #12
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O.K. I found out what is going on - but that confuses me even more:

I have my EGT circuit attached to ADC1 and the KnocksenseMS output to ADC2,

The gauge that reads my EGT is EGTgauge6.

So I had a go and put two new gauges on my TS dash ADC6 and ADC7.

ADC6 (which would be JS5) shows values equal to my EGT, ADC 7 shows 12xx or very low like 13x - which I assume would compare with the Knocksense output. (And changes when I turn the pot on my knocksense to such a low level that the LED lights)

According to the DIYPNP manuals ADC1 is JS4 and ADC2 is JS5 - but in the pulldown menu of the knock settings I have the choice of JS5/ADC6 or JS4/ ADC7.

As I have my Knocksense attached to ADC2 I choose JS5, which gives me wrong knock readings (as I can see via my knocksense led) - when I chose JS4 I get no knock reading even when the led lights...

Something seems to be wrong - my fault?

Thanks for any suggestions...!

Edit: @Ben - Pin 16 reads 5 volts even when indicating knock.
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Old 04-08-2010, 05:14 PM   #13
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ADC6=JS5=SPARE_ADC_1
ADC7=JS4=SPARE_ADC_2

Jim
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Old 04-09-2010, 04:18 AM   #14
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Quote:
Originally Posted by Reverant View Post
ADC6=JS5=SPARE_ADC_1
ADC7=JS4=SPARE_ADC_2

Jim
So this is a bug in the DIYPNP documentation I guess?

http://diyautotune.com/diypnp/docs1_...a_outputs.html

ADC1 (JS4) Baro correction, knock input, launch control, second O2 sensor, nitrous input
ADC2 (JS5) Baro correction, knock input, launch control, second O2 sensor, nitrous input


Could Ben or Matt please confirm?
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Old 04-09-2010, 05:02 AM   #15
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I guess so, check the schematics:

http://www.megamanual.com/ms2/pcb.htm
JS4=AD7
JS5=AD6

http://www.microsquirtmodule.com/mod_hardware.htm
AD6=SPAREADC
AD7=SPAREADC_2

So AD6=JS5=SPAREADC and AD7=JS4=SPAREADC_2

Jim
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Old 04-09-2010, 12:06 PM   #16
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That was a bug in the documentation. I have now fixed it. Thanks for letting us know.
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Old 04-09-2010, 01:51 PM   #17
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Seem to be my fate that I always am the one to get to such points...

Nice to know what the problem was...

One more thing Matt - I think it also should be changed in the Mass Air Flow Sensors.

Board connection Processor port Firmware setting (B&G Code)
MAP AD0 MAF on MAP Pin
ADC1 AD7 MAF on Knock Pin (as we learned ADC1 is AD6)
ADC2 AD6 MAF on Baro Pin (also ADC2 is AD7 then)

I hope this gives me some extra % for my next order... ;-)

Greets
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