Code help
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
Code help
I performed the KOEO test on my truck this morning. Engine was at operating temperature when tested. I'm getting 2 active codes and 1 stored code.
Active codes,
552 Thermactor air bypass solenoid fault
565 Canister purge solenoid circuit fault
Stored code,
334 EGR closed valve voltage high
Not being very familiar with the emissions systems on this truck can someone help me understand these issues. Thermactor and canister, I have no clue.
EGR valve I am somewhat familiar with, but don't understand the voltage high part.
One other thing to mention. I have no check engine light when driving the truck and it does seem to run very well.
Thanks, Jeff
Active codes,
552 Thermactor air bypass solenoid fault
565 Canister purge solenoid circuit fault
Stored code,
334 EGR closed valve voltage high
Not being very familiar with the emissions systems on this truck can someone help me understand these issues. Thermactor and canister, I have no clue.
EGR valve I am somewhat familiar with, but don't understand the voltage high part.
One other thing to mention. I have no check engine light when driving the truck and it does seem to run very well.
Thanks, Jeff
Logistics Pro
Joined: Aug 2010
Posts: 3,716
Likes: 583
From: Chillicothe
The 565 i had was crap from the charcoal canister jammed the purge solenoid. Some tapping and blowing air freed it up and i put a cheap clear lawnmower fuel filter between the canister and solenoid. Cuz im a cheapass.
The other codes i havent dealt with myself so maybe someone else can help with that.
The other codes i havent dealt with myself so maybe someone else can help with that.
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
What exactly is the thermactor? Is it the part mounted directly in front of the EGR with a line coming from the charcoal canister? Has a line in-line out and an electrical plug?
The truck is 100% bone stock with all smog equipment intact.
The truck is 100% bone stock with all smog equipment intact.
Cargo Master
Joined: Aug 2021
Posts: 2,251
Likes: 740
From: Maryland
Cargo Master
Joined: Aug 2021
Posts: 2,251
Likes: 740
From: Maryland
Thermactor is the big word for the entire air injection system. The air pump pumps air that is either diverted to the exhaust system by the TAD (thermactor air divert) solenoid, or bypassed out into the air by the TAB (thermactor air bypass) solenoid. The ecm expects to see changes at the O2 sensor(s) that correspond to commands that have been given to the TAD and TAB solenoids. It's possible to have an O2 sensor issue that makes the ecm think the thermactor system isn't functioning. I would look for simple stuff first. Is the connection at your TAB solenoid good? Clean and tight?
Trending Topics
Cargo Master
Joined: Aug 2021
Posts: 2,251
Likes: 740
From: Maryland
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
Wow... that link went so far over my head it may as well have been the space shuttle. I will check all vacuum lines and connections and get back to you. Following the diagram in the link should not be hard. Thank you Soup Bean. Having a starting point really helps.
When you say connection at the TAB, are you referring to electrical or vacuum connection?
When you say connection at the TAB, are you referring to electrical or vacuum connection?
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
I think I may have gotten lucky with this issue. I got a new 02 sensor the other day and started to soak the old one down with PB Blaster. This morning I was ready to do battle with the old 02 to get it removed. I put a wrench on it and it spun right out. The thing was not much better than finger tight. Whomever installed it never tightened it much at all. The crush washer was not even crushed. I installed the new one anyway. The truck runs much better. The idle smoothed right out on it. Going to run the codes again and see if it helped there. Crazy someone would install a sensor and never tighten it.
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
When I pulled the old 02 it was black sooty deposits. Looked like it was running pretty rich.