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Posted 15 December 2012 - 04:33 PM
Not that it probably help, but what causes it to upshift. One person says its the throttle position sensor and another says a temperature probe?
Posted 15 December 2012 - 08:01 PM
If so the TCU is programmed to stay in 3 until the engine is at a certain temperature for pollution reasons, so it could be "normal".
I had a 95 Legacy and altered my route to work in the winter because I was less than 3 minutes to a major 65 mph highway and I'd have to endure driving another 4 or 5 minutes at high RPMs just to keep up with the slow traffic.
Edited by Suzam, 16 December 2012 - 07:19 PM.
Changed "ECU" to "TCU"
Posted 16 December 2012 - 05:18 PM
The TCU will not shift to 4th gear until the trans temp reaches 64 F. It will lock up the torque converter at 162 F. The temperature lamp comes on at 230 F.
I added a cooler on mine, and it would take longer to lock up the torque converter. So I modified the software and lowered the lockup temp just a bit.
Edited by presslab, 16 December 2012 - 05:26 PM.
Posted 17 December 2012 - 03:43 PM
Posted 18 December 2012 - 08:06 AM
Posted 18 December 2012 - 11:51 AM
Posted 18 December 2012 - 12:27 PM
In 3rd gear you can go any reasonable speed, I don't see how it's dangerous. If I recall I can do about 120 MPH in 3rd. Heck my trans will pull 2nd all the way to 80 MPH. Running the engine faster warms it up sooner reducing emissions and wear.
Posted 18 December 2012 - 01:43 PM
There are older threads on the board discussing this delay of shift to 4th when cold.
I've also had a 97 & 99 2.2 that did not do this, or if they did, not to the same extreme as the 95 2.2 did maybe soa adjusted the specs later on.
Edited by Suzam, 18 December 2012 - 01:56 PM.
Added info and can't spell.
Posted 19 December 2012 - 11:27 AM
Posted 19 December 2012 - 03:04 PM
as far as i know the temp senser in the trans is for default if overheated not to tell tcu what temp the trans is. If the trans overheats to the point of turning on the AT light the fans will turn on to try and cool it. I have many auto outbacks that come thrugh so will test drive them all cold and see if there is a difference in how they shift hot /cold
I'd be interested in your results. Especially relating to a 95 model.
I'm pretty sure you get enough cold weather where you are in BC.
Posted 20 December 2012 - 12:20 AM
seg006:D683 cmpa ATF_TempCold seg006:D686 bhi loc_D68A seg006:D688 orab #$20 ; ' ' seg006:D68A seg006:D68A loc_D68A: ; CODE XREF: GetADC+63j seg006:D68A stab shiftFlags1
seg006:D8F2 ldaa shiftFlags1 seg006:D8F4 anda #$60 ; '`' seg006:D8F6 beq loc_D901 seg006:D8F8 ldaa byte_BC seg006:D8FA cmpa #3 seg006:D8FC bne loc_D901 seg006:D8FE dec byte_BC seg006:D901 seg006:D901 loc_D901: ; CODE XREF: CalcShift+8j
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