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#1
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ECU operation in P and N
I am about a quarter of the way through the Memory Dump thread, searching for an explanation of the effects of grounding the N and P pins on the ECU. One would think that the engine would operate the same in either instance, but there must be a difference, otherwise why two pins. Maybe a rev limiter in P but not in N? Anyways, if anybody knows the difference, I would love to know what it is.
I am thinking that in my swap I will use the parking brake switch to ground the light green wire (P). This will (I believe) let me remove the key when the parking brake is pulled, meaning I will be forced to use the E-brake every time I park. I think this is a good habit with a 5 speed, plus it will keep my e-brake cable working often and lessen the chance of it seizing (I hate that). Now for the neutral pin, I am undecided if I want to run it only to the lower clutch switch, or also use the in gear switch in the transmission wired in a way to ground the light green/yellow wire (N) when the transmission is NOT in gear. Any input or advice is appreciated. |
#2
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Re: ECU operation in P and N
Anybody??? I know somebody out there has tried to see the difference between grounding the N and the P.
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#3
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Re: ECU operation in P and N
From looking at the ECU program, they are mostly the same.
There are a few small differences, for example: I *think* the calculation for the idle solenoid is slightly different in P compared to N. It's unlikely that anyone can give you a definite answer. I would just go with your best instinct, and then have a rethink if it doesn't work.
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#4
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Re: ECU operation in P and N
Thanks
Probably not much difference, then. |
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