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S1 Stagea Auto Trans Electrical Issues

frigjam

By frigjam,
in Four Door Family & Wagoneers

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frigjam

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G'day. I have searched on this one and couldn't see anyone with anything remotely the same as my problem. There is a gremlin in my car, I will explain...

The car goes straight into 4th gear even when dead cold (the last stagea I drove stayed in 3rd for a few minutes, once warmed up then went into 4th - i assume this is the norm)

The O/D off button does nothing - stays in 4th all the time. The light comes up on the dash however.

Snow and Power buttons have no effect what so ever. The lights show they work.

The car drives beautiful and shifts as per normal, kicks back when given throttle, etc... But I'm definitely lacking the 'power' function, I believe this function should work if you give the car a hiding even with the power button not pushed in? O/D off would be most handy for going up hills, the car chops and changes gears like a bastard...

So I have checked all wiring, plugs and switch functions inside the car and under bonnet. Have traced all relevant wiring back, no damage or bad connections I can see. I haven't had a chance for a real good look underneath yet. I worked as an auto sparky for many years, I remember fixing a similar issue on an R31, it was a faulty speedo divider circuit in the back of the instrument cluster, I was able to diagnose it easily from wiring schematics...

Does anyone have any electrical schematics so I can work out how all this is supposed to work? Any other ideas?

Cheers

Paul.

frigjam Collaborator

frigjam

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Just checked the ATTESSA controller located in the LHS cargo area behind the trim, no error flashes on the LED... Anyone got pinouts for this controller? Only ones I can find are for what looks like earlier model skyline ATTESSA controllers that have 4 plugs, this one of mine has 1 big plug and a 10mm nut in the middle.

frigjam Collaborator

frigjam

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Had a good look under the car today, everything looks good and intact as far and the wiring harness goes...

It almost makes me think the car does not realise it is out of Park when it is in actual fact in Drive... Although the dash display of the transmission selector works.. I give up for now :wacko:

frigjam Collaborator

frigjam

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Still having no luck with this... I am wondering if there is a problem with the ECU, either faulty or possibly the wrong one (ie, ECU is from a R33 manual or something)... I'll have to check this after work.

Anyone got any ideas? This is driving me nuts!

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