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Author Topic: GM FlexFuel sensor wiring requirements?  (Read 6377 times)
elRey
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« on: October 19, 2015, 09:02:10 PM »

Does anyone know if the ME7 hardware has what's needed to drive/read the GM ethonal sensor? Specificslly the pull-up. Not asking about code.



wiring: GM Part # 13352241
sensors:
GM Part # 13577394 - Long line version with mounting points.
GM Part # 13577379 - Short line version with mounting points.
GM Part # 13577429 - Basic sensor without mounting points.
« Last Edit: October 24, 2015, 05:10:27 AM by elRey » Logged
elRey
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« Reply #1 on: October 22, 2015, 05:09:44 PM »

http://nefariousmotorsports.com/forum/index.php?topic=2955.msg28689#msg28689
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elRey
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« Reply #2 on: October 23, 2015, 12:49:03 PM »

Is there a simple way to do a resistance test between pin #61 or #20 and Huh to see if there is a pull-up or pull-down resistor present?
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nyet
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« Reply #3 on: October 23, 2015, 07:58:03 PM »

Yes with ECU powered down, check resistance between VCC (+5 to ttl chips, not +12v) and pin and ground and pin.
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

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elRey
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« Reply #4 on: October 24, 2015, 05:12:26 AM »

If there is not a resistor, could we just add a resistor inline on the wiring harness between signal wire and power wire?

Also, where on the pcb is a good place to source vcc or sensor +5v if I add a resistor inside?

Thanks,
Rey
« Last Edit: October 24, 2015, 06:21:29 AM by elRey » Logged
nyet
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« Reply #5 on: October 25, 2015, 01:37:48 AM »

If there is not a resistor, could we just add a resistor inline on the wiring harness between signal wire and power wire?
yes but the closer to the input the better.

Quote
Also, where on the pcb is a good place to source vcc or sensor +5v if I add a resistor inside?

Find a datasheet for an IC nearby. For DIPs and PSOPs, usually one of the corners is vcc
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
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