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1997 Subaru Legacy check engine code P0743

Tiny
LYNNTOMFLY
  • MEMBER
  • 1997 SUBARU LEGACY
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 18,300 MILES
Got code P0743, indicating "torque converter clutch circuit electrical." Looked at a couple of sites, including a Toyota site that indicated serious troubleshooting to determine if problem is ECM, shift solenoid valve, or harness/connectors.

Any suggestions?

I'm not into heavy maintenance, i.E, going into the transmission to check/change valve.

BTW, what's the ECM?

Many thanks!
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Thursday, October 1st, 2009 AT 4:26 PM

4 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
I would expect a high probablity of the the solenoid.

However if there has been work done that the harness was damaged, that can change things.

The ECM is the electronic control module AKA the "computer". Powertrain control module. Tamatoes, tahmahtoes.

Do you want testing procedures?
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Thursday, October 1st, 2009 AT 5:54 PM
Tiny
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Yes, please.

Thanks!
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Friday, October 2nd, 2009 AT 12:03 AM
Tiny
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I sent some info to your e-mail. If it is not there, check your spam folder.


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Verify the flash codes, I think this will be #16
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Friday, October 2nd, 2009 AT 6:37 AM
Tiny
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Many thanks.

Now I can talk intelligently with the transmission shop.
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Friday, October 2nd, 2009 AT 6:44 AM

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