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Re: Please Help! TCU code 25
The ECU supplies approx 5 volts on the Torque control wire. The TCU pulls this voltage down to zero (ie grounds the wire) when it wants to signal the ECU to reduce power for a gearshift.
It sounds like a faulty TCU to me.
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II
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