tps calibration, adc raw values and flood clear

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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kritip
MegaSquirt Newbie
Posts: 21
Joined: Thu Jul 26, 2007 3:49 am

tps calibration, adc raw values and flood clear

Post by kritip »

I have a tps that read from 39 to 140 raw values. Another that reads from 30 to 88 (different manifold)...both these are off fiats, and one from a rover that reads from 20 to 220.

The rover one will be fitted in the end and provides the greatest resolution but i will have to make do with the 39 - 140 TPS for now.

I calibrate it, fine, but when i change the flood clear point on my ms-extra, it doesn't seem to make any difference. I can only ever get ti to trigger with the 20 - 220 TPS calibrated :shock: regardless of what i do.

Are there any other settings that use a raw adc value, that using my current tps could cause problems with, and can i get my current setup to enable flood clear?

Cheers,

Kristian
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newtyres1
Helpful Squirter
Posts: 48
Joined: Mon Feb 06, 2006 7:32 pm
Location: Brisbane, Australia

Post by newtyres1 »

When you "calibrate" the TPS sensor the raw ADC value does not change. So to get the flood-clear mode with your 39 - 140 (raw ADC) TPS sensor, set flood-clear to something below 140, say 120 or so. If that doesn't work, let us know what code are you using, I'm talking about MS1-Extra.

Ian.
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kritip
MegaSquirt Newbie
Posts: 21
Joined: Thu Jul 26, 2007 3:49 am

Post by kritip »

thats what i tried, but flood clear won't trigger. I set it to 120, saved it, reset MT and MS and it still didn't seem to trigger. Thats why i'm confused lol

Cheers for your help anyway.

Kristian
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newtyres1
Helpful Squirter
Posts: 48
Joined: Mon Feb 06, 2006 7:32 pm
Location: Brisbane, Australia

Post by newtyres1 »

OK, the MS chip requires a voltage higher than 120 ADC which is 120/256 x 5 = 2.34V before it will do flood clear mode. So with the MS powered up, engine not running, and someone or something holding the pedal to the metal, can you measure a voltage greater than 2.34V at pin 26 of the microprocessor? or from the wiper of the pot?

How are you testing flood clear mode?

I have never tested it or used it myself, you could be discovering an unknown bug for all I know : )

Ian.
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