95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

PO78 Shift Sel Circuit B Electrical?

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Old Jul 16, 2009 | 08:05 AM
  #1  
roundhouse's Avatar
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PO78 Shift Sel Circuit B Electrical?

getting this code. and the trans is shifting funny.
doesnt slip, just randomly goes from 1st to 3rd or 4th at 12mph or sometimes wont shift into 2nd, if you wind it up enough it goes from 1st to 3rd, and about 2 seconds later into OD.


CHecked all the wires on the trans.

What should I check next?

Last edited by roundhouse; Jul 16, 2009 at 03:05 PM.
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Old Jul 16, 2009 | 11:13 AM
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From: Frederick, MD
Drain transmission fluid.
Drop the transmission pan.
Replace affected shift solenoid.
Install pan.
Replace fluid.
Profit.

Let me Google that for you.
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Old Jul 16, 2009 | 03:07 PM
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Originally Posted by jimig
Drain transmission fluid.
Drop the transmission pan.
Replace affected shift solenoid.
Install pan.
Replace fluid.
Profit.

Let me Google that for you.
So how do I know which sel to replace?

I assume it the one for 2nd gear since thats the one thats mostly affected.

it sometimes skips 2nd and shifts from 1st to 3rd at about 8 mph or winds up to 4000 rpm and goes from 1st to 4th
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Old Jul 17, 2009 | 02:55 AM
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From: Frederick, MD
He essentially has the answer in the title.

PO78 Shift Sel Circuit B
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Old Jul 20, 2009 | 05:21 PM
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Originally Posted by jimig
He essentially has the answer in the title.
And where would I find that inside the trans?
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Old Jul 23, 2009 | 04:07 PM
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Originally Posted by roundhouse
And where would I find that inside the trans?
And how do I know which is the "B" circuit sel?

Bueller?

Bueller?
Beuller?
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