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blown wire harness???

Old 07-27-2005, 03:47 AM
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Default blown wire harness???

so my map sensor connection was rigged.. i had to extend it to fit the obd-2 manifold using the obd-0 harness.. it was working decent, but the connections were butt-connected and ------- up a little... so i wanted to solder it n clean it up.. my friend cut all three wires at once and we used a new plug from an obd-2 harness, and had one connection for each wire that was soldered. well i go to turn it on and the vafc reads -760mmHg which is the max as if its unplugged and it wont stay on when i start it.. i changed map sensors, i put in a different ecu, changed map chips from a tuned one to a basemap and back, and reset it.... any ideas of what could be wrong?? could it be that the wires got burnt out on the way to the ecu?



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Old 07-27-2005, 08:17 AM
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Default Re: fucked up map sensor .. need help

My guess is you mixed up the Reference signal and the +5v wires
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Old 07-27-2005, 06:31 PM
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Default Re: fucked up map sensor .. need help

well all the wires running from the sensor plug to the harness are all the same color and order from odb-2 and obd-0, and thats the only thing i changed, can the're be a problem with the vafc since it intercepts the signal from the white wire?
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Old 07-27-2005, 08:27 PM
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Default Re: blown wire harness???

well i tried some other ---- but i think i blew something out because now i cant get any spark is there any way i shorted out the wire harness or something, and is there any way to test if its good?
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Old 07-27-2005, 09:17 PM
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Default Re: blown wire harness???

well i guess the harness isnt blown cause i got it to start kinda but its still not getting signal from the map and im stumped, i disconnected the vafc and ran the wires stock, but im still not getting any signal....... iono im pissed
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Old 07-27-2005, 09:21 PM
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Default Re: blown wire harness???

dude its not the vafc its your wiring. Make sure the connections are good double check thats what it is
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Old 07-28-2005, 12:04 AM
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Default Re: blown wire harness???

yea i ran new wires straight from the map sensor, and i repinned the ecu wires with ones from an old wire harness, so all the wires are completly new, and i ddouble checked the connenctions and soldered most of them.... the vafc is still not showing any signal, and the ecu isnt flashing any codes..... i swapped the 5v wires but didnt touch the white wire, going to the vafc... so iono
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Old 07-28-2005, 12:55 PM
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Default Re: blown wire harness???

Test the wires with a DVOM.

one wire will always be +5v with KOEO (key on engine off)
one wire will always be 0V with KOEO
one wire will be somewhere inbetween 0-5v and will be roughly 2.65v

make sure you hooked them all up correctly...i never trust wires being the same color...always test
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Old 07-28-2005, 06:28 PM
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Default Re: blown wire harness???

which one runs throught the vafc?
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Old 07-28-2005, 10:51 PM
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Default Re: blown wire harness???

Reference
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