terrano d21 trans issue?

[dan-n]

I have been driving a d21 auto terrano for a while now and when you start it up and take off for the first time it wont change out of first, if you turn it off and put your foot on the gas pedal until you here a click then start it, it hen drives fine?? Any one had this with theres an how did you fix it?

Cheers

[Crash bandicoot]

That's a new one, what year and what engine? and what position was the selector in at the time?

[MihiT]

I don't deal with automatics so I'm just going to throw the words "shift solenoid" at you and hopefully I'm correct.

[ChurchurDan]

Stuck in first can be a symptom of a failed speed sensor. But why it would reset when the key is cycled is strange, a failed sensor wont magically heal its self.

[dan-n]

Its a 92 with a td27 motor, I will have a look at it in the weekend, I suppose I could see what is clicking when you put gas pedal all the way down that must have something to do with it, may be some sort of throttle sensor?

will let you know if I can find out.

[ChurchurDan]

The accel pedal has a full throttle switch, this may be your clicking.

[Crash bandicoot]

worst case scenario if ya cant sus it is to unplug the auto trans ecu and let it run default shifts, it will still work but shift a bit harsher.

[ChurchurDan]

Unplugging the trans ECU should result in the trans stuck in 3rd gear as it is the only gear that doesnt need a solenoid energised.

[Crash bandicoot]

Unplugging the trans ECU should result in the trans stuck in 3rd gear as it is the only gear that doesnt need a solenoid energised.

erm...mine doesnt have an ecu anymore and shifts fine. park, reverse, nuetral,drive, 2nd and 1st are all controlled by the actual lever not the ecu,...jatco transmissions a wired backwards(for lack of a better term the ecu gives refinement and smooth shifting and lock up of TC at set speeds, thats why it needs an ecu to know at what speed and engine speed to best change gear...by default with no ecu will change at 20 50 80 and have to wire TC to lock up manually.

[ChurchurDan]

You do realise that the RE4R01A trans in a D21 is electronically shifted in drive, P R and N require no TCM input. The trans require 2 solenoids to be energised to select 1st gear so it is technically impossible to have a 1 2 3 shift without a TCM.
I have seen you post before crash that yours works without the TCM but I am starting to think it was not the TCM you unplugged but the engine ECU instead, or you have a completely different transmission in your Mistral to what the Terranos have.

Anyway have a read of this Dan-n it has some good diagnostic info for these transmissions

http://www.240edge.com/manuals/89-90_240sx/auto_tra.pdf

[Crash bandicoot]

My truck has no ecu,s at all anymore. The solenoids you mention have there own power source and the switch to control them is on the side of the trans that is directly controlled by the lever you use to shift gears.
Hence why it will still operate witgout a computer. And will never go into limp mode once the ecu is unlugged as there is no longer anything to tell the trans otherwise.

[ChurchurDan]

I have one of these transmissions sitting on my garage floor and the gear selector position switch is not connected to the solenoids at all, they are 2 separate wiring connectors to the vehicle. 1 grey and 1 brown plug plus the 3 pin output shaft speed sensor and the 2 pin inhibit switch. Also there is no separate power to the solenoids as they are grounded inside the transmission and powered in sequence by the TCM. If you have a look at the link above and scroll down you will find wiring diagrams which dont support your theory. I still think you have a tcm you are not aware of and if it anything like a D21 in layout it will be in the left rear guard.

[Crash bandicoot]

I have one of these transmissions sitting on my garage floor and the gear selector position switch is not connected to the solenoids at all, they are 2 separate wiring connectors to the vehicle. 1 grey and 1 brown plug plus the 3 pin output shaft speed sensor and the 2 pin inhibit switch. Also there is no separate power to the solenoids as they are grounded inside the transmission and powered in sequence by the TCM. If you have a look at the link above and scroll down you will find wiring diagrams which dont support your theory. I still think you have a tcm you are not aware of and if it anything like a D21 in layout it will be in the left rear guard.

nope no ecu's left period.

My mistral has a RE4R01A. The RE4R01A has a manual Valve controller.(it is directly connected to the selector cable from the gear shift.....) and is clearly evident if you look at the hydraulic diagram.. the actual A and B valve's are feed from one side by the solenoids and the manual control valve from the other.

It over rides the A&B shift solenoids when you select 1st or 2nd locking out A&B solenoids, But when Drive is selected it is left to the TCM to select 1st or 2nd to suit the operating conditions.