GM FlexFuel sensor wiring requirements?

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Topic: GM FlexFuel sensor wiring requirements? (Read 7126 times)

elRey

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	GM FlexFuel sensor wiring requirements? « 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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	Re: GM FlexFuel sensor wiring requirements? « 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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	Re: GM FlexFuel sensor wiring requirements? « 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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	Re: GM FlexFuel sensor wiring requirements? « 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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elRey

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	Re: GM FlexFuel sensor wiring requirements? « 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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	Re: GM FlexFuel sensor wiring requirements? « Reply #5 on: October 25, 2015, 01:37:48 AM »

Quote from: elRey 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?

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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