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1993 Legacy L Transmission Control Unit...

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I suspect I have a bad TCU that is setting Duty C Solenoid faults like crazy and causing some weird torque bind issues. I have replaced the solenoid, twice, and the clutch pack, etc... I had some professionals take a stab at it and they couldn't figure it out since the problem is very sporadic, but I have had it set fault codes after clearing them and before even driving the car - as if the codes don't want to leave the TCU. A jumper was run from the TCU to the solenoid connection to rule out wiring in the harness between the two - and the only thing that hasn't been changed is the TCU itself - as a new one costs a mere $600 I haven't been prepared the buy one as a test unit yet.

 

1. Do TCUs fail occasionally on this model?

2. If you have replaced one before - what were the symptoms?

 

Any help with this phantom electrical issue would be wonderful.

Thanks

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