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View Full Version : P75 ECU Throwing VTEC Trouble code


JoshDC2
06-25-2008, 08:57 PM
I bought a used OBD1 P75 ECU when i was putting in the b20b into my 95 Integra GSR(long story). ****\/\/\/\/PICTURES\/\/\/\/****

Got everything in and running and the car is throwing MIL. Shorted the SCS and it tells me that the issue is #21. In the shop manual it says that that is for the VTEC Pressure Switch...
The issue is that the OBD1 P75 is supposed to be for a 94-95 LS Integra... :but: it shouldn't have the arcitecture or be looking for a signal from the VTEC Pressure Switch.:crazy:

I was thinking about putting a resistor in the connector for the Pressure Switch so that it thinks that it is connected. If this doesn't work then i guess my only option is to get a different ECU and hope that the code goes away...

If anyone has any idea of what could be going on or any ideas of things to do it would be greatly appreciated. I need to pass emissions very soon and can't have the MIL(check engine light) on.

JoshDC2
06-25-2008, 09:07 PM
ttt

JoshDC2
06-25-2008, 10:37 PM
I've got pictures of the insides of the ecu:

Whole Thing 1:
http://i228.photobucket.com/albums/ee8/joshek4/SV400051.jpg

Whole Thing 2:
http://i228.photobucket.com/albums/ee8/joshek4/SV400055.jpg

Whole Think 3:
http://i228.photobucket.com/albums/ee8/joshek4/SV400061.jpg

Pin Side:
http://i228.photobucket.com/albums/ee8/joshek4/SV400060.jpg

Other Side:
http://i228.photobucket.com/albums/ee8/joshek4/SV400059.jpg

One Thing: The circled chip doesn't look stock...:hithead:
http://i228.photobucket.com/albums/ee8/joshek4/SV400059a.jpg

JoshDC2
06-25-2008, 11:04 PM
it is chipped, see the spot j1? cut that and it will run as a stock ls ecu

could you point it out to me? i dont see it

JoshDC2
06-25-2008, 11:07 PM
ah! the tall skinny wire connection with no resistor in it correct?

JoshDC2
06-25-2008, 11:16 PM
so by cutting that connection im disableing the chip essencially. making it so that the ecu operates the way honda intended

JoshDC2
06-25-2008, 11:28 PM
word thx try it in the morning

JoshDC2
06-26-2008, 09:11 PM
well i cut the conection and the MIL went away
however now the car is stalling quite often...

dluv-22
07-16-2008, 03:37 PM
should.have.just.traded.some1.for.a.stock.LS.ecu