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552 code help

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

552 code help

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Old

Apr 22, 2023 | 08:28 AM

#1

yeet

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Tuned

Joined: Feb 2023

Posts: 278

Likes: 86

552 code help

I'm getting a 552 code in the KOEO test.
552 is Thermactor air bypass solenoid circuit fault
What solenoid is this? where is it located?

Is it a TAD or TAB solenoid or something else in a different location?
If I can nail down what solenoid it is I can start tracing electrical and vacuum lines from that location.

Thanks, Jeff

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Old

Apr 22, 2023 | 09:20 AM

#2

Soup bean

Cargo Master

Joined: Aug 2021

Posts: 2,258

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From: Maryland

The electrical connector "key way" is centered on a TAB solenoid, it's off to one side on the TAD solenoid. They're mounted side by side, on the driver's side of the engine.

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Old

Apr 22, 2023 | 09:35 AM

#3

Soup bean

Cargo Master

Joined: Aug 2021

Posts: 2,258

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From: Maryland

On the back of your engine, the green dot is where the vacuum line from the TAB solenoid should connect. The red dot is where the vacuum line from the TAD solenoid should connect.

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Old

Apr 22, 2023 | 09:39 AM

#4

yeet

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Tuned

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Perfect. Thank you! I've got new vacuum lines and assorted T's. Finally ready to tackle this thing today.

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Old

Apr 22, 2023 | 10:08 AM

#5

Soup bean

Cargo Master

Joined: Aug 2021

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From: Maryland

Hoping to start mine on my next days off.

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Old

Apr 22, 2023 | 10:53 AM

#6

yeet

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Tuned

Joined: Feb 2023

Posts: 278

Likes: 86

Quote:

Originally Posted by Soup bean

Hoping to start mine on my next days off.

Good luck soupbean. I'm hoping that taking care of the KOEO 552 issue will also take care of the KOER 311 code I'm having.

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