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P1722 code, but what does it mean?


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4 replies to this topic

#1 KRB64

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Posted 27 July 2014 - 09:31 AM

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,



#2 Fairtax4me

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Posted 27 July 2014 - 10:02 AM

What year and model?

Any shifting problems?

Pretty sure the diagnosis circuit is the one that puts the TCU into self diagnostic mode. I would have to look it up in the FSM though to be sure.

#3 KRB64

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Posted 27 July 2014 - 10:16 AM

No, seems to shift fine.

 

1997 Legacy

 

Thanks,



#4 Fairtax4me

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Posted 27 July 2014 - 10:52 AM

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.expe...u_manual_scans/

Edited by Fairtax4me, 27 July 2014 - 10:53 AM.


#5 KRB64

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Posted 28 July 2014 - 03:50 AM

Wow, thanks. That's a great link.

 

I cleared it and drove about 50 miles yesterday with no issues.






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