Question about 1991 Subaru Legacy

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Transmission fault codes

I have a 1991 subaru legacy awd. The power light is flashing a code and I need to know where to look up the list of codes. Everyone has engine codes, but no tranny.

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  • Anonymous Oct 27, 2008

    91 legacy AWD auto trans the car will only change gears when you let off the gas pedal,if you hold the gas pedal steady it wont shift up to the next gear..thank you for reading

  • GOINPOSTAL Mar 15, 2009

    91 legacy wagon, power light flashes after starting, rear wheels "stutter" on tight turns,& sometimes "jump" when car shifts into drive, reverse or park.

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On my 98 Legacy I removed the cover below the steering column (RH drive vehicle) and looked for the 4 diagnostic plugs towards the centre of the car. Mine has 2 green ones and 2 black ones, normally unplugged. Just one or 2 wires in each. With ignition off I plug the black ones together, then turn on the ignition. The Check Engine light flashes our the code(s). eg 2 longs and 2 shorts = 22.

Posted on Nov 10, 2015

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Doesnt anybody know how to retrieve the tcu fault codes on a 91 legacy awd 4EAT trans, And please dont dodge the question like everyone else has...you can get the process for later models,it has to do with ignition and the shifter.when you do this right,the led light on the tcu will blink out the codes.please steer me in the right direction,BUT not over a cliff i might try it at this point.......THANKS GUYS

Posted on Nov 07, 2008

  • odiebo Dec 17, 2010

    With the engine off and key off, shift the transmission into drive with the overdrive cancelled (light on), turn the key on but don't start the engine. Shift into 3 and push the overdrive cancel button once, Shift into 2 and again push the over drive cancel button once, then shift into 1st and once more push the overdrive cancel button. Then fully depress the gas pedal and hold until the POWER light begins to flash.

    Long flashes are your 'tens', short flashes are your 'ones'. Always a 2 digit number, so a single long flash followed by a pause and then 2 short flashes would be a 12.

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Input the codes in goggle search word it like this "what are DTC's P0000 and so on."

Posted on Jul 31, 2008

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