swapping a auto for a 5spd on obdII
ok i am swaping the svx engine into a impreza with manual trans. my question is for OBDII and the auto trans.
does anyone know if the Check engine light with come on if there is no tcm, and if so does anyone know if i add a resistor to 1 of the 4 wires will act as a tcm, or does anyone have an idea? (no getting an svx is not an option) James |
Re: swapping a auto for a 5spd on obdII
Im not sure how many more time you are going to ask but this is damn sure the last time I will tell you.... NO... **** NO.
The ECU and TCU communicate via a data link... "They speak to eachother in pulsewaves" No resistor or other hodgepodge crap is going to work. Use an auto trans, reprogram the first OBDII ECU to stop looking for the TCU, or go suck eggs Tom |
Re: swapping a auto for a 5spd on obdII
id listen to tom... only based on the fact that eggs are high in cholesterol... and we dont want that now do we?
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Re: swapping a auto for a 5spd on obdII
there are prob 4 threads from him asking the same thing... How many times do you need the same answer?
Tom |
Re: swapping a auto for a 5spd on obdII
yea there is 4 or more threads, but until i can figure it out i am going to keep asking,
plus there isn't anyone to reprogram OBDII ecu's. i looked. i was told that the resistor might work. james |
Re: swapping a auto for a 5spd on obdII
its a datalink, not a resistance check. Unless you can find out what frequency they chat at and design a control module to emit the proper pulse-waves when they are needed, it is not gonna happen... Just because you keep asking doesn't mean the answer you want is going to jump up and bite you in the ass.
Tom |
Re: swapping a auto for a 5spd on obdII
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Re: swapping a auto for a 5spd on obdII
As far as I know the ECU has the pressure sensor, and sends a varying voltage to the TCU, of 0 to 4/5volts. The TCU uses this voltage level, to use a shift map, that suits the altitude that the car is at.
If this is right, the ECU will only look at the line for an 'open or shorted' line. I think it can be satisfied by using a resistor on the ECU line, to ground, of about 3.9K. The ECU then just works this line OK, like it is the TCU that is on the end of the line. I don't have the wiring diagram for the OBD11, so don't know that pin number it is. I remember Phil said that this was the way the Altitude system worked, in his TCU thread, have a look there. Harvey. |
Re: swapping a auto for a 5spd on obdII
That is OBDI system. The OBDII system needs a wavelength input from the TCU... I am not blowing smoke or deterring... Just simply that the OBDII system communicates through the ECM for the TCU for error codes and the like. It needs a datalink to do so
Tom |
Re: swapping a auto for a 5spd on obdII
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Re: swapping a auto for a 5spd on obdII
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Harvey. |
Re: swapping a auto for a 5spd on obdII
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To you have the wiring diag for the TCU?:) Harvey. |
Re: swapping a auto for a 5spd on obdII
i have them both for a 96. there is 4 wires that connect ecu to tcu. ecu pins are 80 (L), 79(LG), 64(Y), 47(LR). and on the tcu they are c11, c16, b5, b9. i have the scans from ALLDATA. (colors too).
james |
Re: swapping a auto for a 5spd on obdII
Harvey,
Just to point out what should be obvious to you. If the ECU does throw a code because of the missing TCU. It's not going to be the pressure sensor that causes it. The pressure sensor is inside the ECU so it's not missing. Phil. |
Re: swapping a auto for a 5spd on obdII
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Tom |
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