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Title: GM FlexFuel sensor wiring requirements? Post by: elRey 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.
(http://creativeion.com/rey/vw/help/gm_flex_fuel_sensor_spec.jpg) 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. Title: Re: GM FlexFuel sensor wiring requirements? Post by: elRey on October 22, 2015, 05:09:44 PM http://nefariousmotorsports.com/forum/index.php?topic=2955.msg28689#msg28689
Title: Re: GM FlexFuel sensor wiring requirements? Post by: elRey on October 23, 2015, 12:49:03 PM Is there a simple way to do a resistance test between pin #61 or #20 and ??? to see if there is a pull-up or pull-down resistor present?
Title: Re: GM FlexFuel sensor wiring requirements? Post by: nyet 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.
Title: Re: GM FlexFuel sensor wiring requirements? Post by: 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?
Also, where on the pcb is a good place to source vcc or sensor +5v if I add a resistor inside? Thanks, Rey Title: Re: GM FlexFuel sensor wiring requirements? Post by: nyet 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 |