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The mkiv Supra Owners Club

Auto box queries


CJ

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Following on from my earlier problem (reverse not engagin), another strange thing ahppened last night and this morning.

 

Last night, when trying to engage reverse, it would not go into gear. it was as if the brake pedal wasnt being pressed and therefore did not release the restrictor.

 

Now, this morning, ALL gears can be engaged from neutral without pressing the brake pedal. :conf:

 

Any ideas?

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now I,m no expert but

I did see somewere that the traction control is some how linked

to the auto box

have you had anything done to this system

checked the fuses, have you checked for any diagnostic codes.

 

this is the limit of my knowledge

but I hope it may jogg an experts mind or give you a clue

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Originally posted by CJ

 

Now, this morning, ALL gears can be engaged from neutral without pressing the brake pedal. :conf:

 

Any ideas?

 

Is this not normal? As it's only locked when in park, and the brake is not pressed. I dont think there is any lock on the neutral gate.

 

When you have this problem have you tried using the magic red button to unlock the park gate? It might be that the solinoid that holds it in park has loose connection or is on it's way out.

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Originally posted by Timwildman

Is this not normal? As it's only locked when in park, and the brake is not pressed. I dont think there is any lock on the neutral gate.

 

When you have this problem have you tried using the magic red button to unlock the park gate? It might be that the solinoid that holds it in park has loose connection or is on it's way out.

 

You have me thinking now. :conf: I always thought that you couldnt go into gear from neutral unless the brake pedal was pressed - maybe it is only when in park.

 

Could someone confirm please?

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Originally posted by suprarob

now I,m no expert but

I did see somewere that the traction control is some how linked

to the auto box.

 

 

The throttle sub butterfly that is used to reduce engine power in the JDM car for TC is also linked to the auto box, the butterfly is used to momentarily reduce torque going through the box during gear changes, more so in auto than manual mode.

 

 

CJ you have had RLTC installed lately, I wonder if a connection was disturbed???

 

With the ignition on but engine not running, do you hear the reverse beep if you select R.?

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TBH I am not sure as RLTC installs usually do not involve the auto ECU. Matt has done many and knows his stuff so I am not suggesting anything directly related with RLTC.

 

From what you describe it sounds like selector switch connections or the switch it self? Or possibly connections to the auto ECU, possibly an intermittant earth? JMHO

 

 

I have never looked at the Auto circuit diagrams on MKIV.com, but they may be worth a look.

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Originally posted by dude

The only thing 'disturbed' here is you dude !!!!!

 

Dude:flame Dev

 

Oh thank you for that vote of confidence. And here I was trying to ingratiate myself amongst the technical fraternity and you ahve just blown my cover! :p

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I had this problem when I had an aftermarket gear shift fitted.

 

Colin, If I remember correctly, there is a bit of adjustment under the auto shifter, (was going to say 'knob', but shifter sounds better!). If incorrectly adjusted, it does stop you from engaging reverse, and likewise, stops you being able to get out of park...

 

When it's down next time, I'm happy to check it out for you.

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