Jump to content
Ultimate Subaru Message Board

P1722 code, but what does it mean?


Recommended Posts

Now I'm getting a P1722 code "Auto Trans Diagnosis Input Signal High Input" I suspect this is related to my torque bind/ Duty C issues.

 

I've searched but can't find out what Auto Trans Diagnosis Input Signal High Input means. Anybody have a clue? What's an input signal anyway for the trans?

 

Thanks,

Link to comment
Share on other sites

This code is for the communication circuit between the TCU and ECU.

 

FSM suggests the cause could be poor grounds for the TCU or ECU.

Or there could be poor contacts in the ECU or TCU connectors.

Or the signal wire is shorted to battery voltage, which the FSM indicates may require replacement of the ECM after fixing the short. Some voltage testing of the wire would be necessary to determine the exact cause. And for that you'll want to have the FSM handy to see pinouts for the ECU and TCU in order to do the testing.

 

Check here for 97 legacy FSM: http://www.main.experiencetherave.com/subaru_manual_scans/

Edited by Fairtax4me
Link to comment
Share on other sites

  • 3 years later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...