Code 542 on EEC-IV but.....
Thread Starter
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Junior User
Joined: Dec 2006
Posts: 62
Likes: 0
Code 542 on EEC-IV but.....
Hey guys.
Just picked up a 93 F250 for a smokin' price. The CEL was on, and after pulling the codes I had a couple questions.
The first code was 122 (TPS). Okay this one is obvious, change it out. However, the intructions state to rotate the sensor assembly clockwise after hooking the blades to the rotator piece.
Clockwise looking from which direction, from the top of the the TB, or the bottom where the sensor goes??
Second code was 542 (fuel circuit failure). Both tanks pump just fine, so, could it be relay going out, or do I just need to clear the code?
Thanks for the help!!
Just picked up a 93 F250 for a smokin' price. The CEL was on, and after pulling the codes I had a couple questions.
The first code was 122 (TPS). Okay this one is obvious, change it out. However, the intructions state to rotate the sensor assembly clockwise after hooking the blades to the rotator piece.
Clockwise looking from which direction, from the top of the the TB, or the bottom where the sensor goes??
Second code was 542 (fuel circuit failure). Both tanks pump just fine, so, could it be relay going out, or do I just need to clear the code?
Thanks for the help!!
Thread Starter
|
Junior User
Joined: Dec 2006
Posts: 62
Likes: 0
Hey guys.
Just picked up a 93 F250 for a smokin' price. The CEL was on, and after pulling the codes I had a couple questions.
The first code was 122 (TPS). Okay this one is obvious, change it out. However, the intructions state to rotate the sensor assembly clockwise after hooking the blades to the rotator piece.
Clockwise looking from which direction, from the top of the the TB, or the bottom where the sensor goes??
Second code was 542 (fuel circuit failure). Both tanks pump just fine, so, could it be relay going out, or do I just need to clear the code?
Thanks for the help!!
Just picked up a 93 F250 for a smokin' price. The CEL was on, and after pulling the codes I had a couple questions.
The first code was 122 (TPS). Okay this one is obvious, change it out. However, the intructions state to rotate the sensor assembly clockwise after hooking the blades to the rotator piece.
Clockwise looking from which direction, from the top of the the TB, or the bottom where the sensor goes??
Second code was 542 (fuel circuit failure). Both tanks pump just fine, so, could it be relay going out, or do I just need to clear the code?
Thanks for the help!!
Posting Guru
Joined: Jun 2007
Posts: 1,394
Likes: 0
From: Des Plaines, Illinois
Advice: pick up a service manual. Even a Haynes/Chiltons is beyond helpful on these trucks.
Per Chiltons:
**disconnect neg batt cable**
1) disconnect tps harness
2) on 5.0 and 5.8 engines, you may need to remove the throttle body
3) disconnect wiring from the sensor
4) matchmark the tps and throttle body. remove the two retaining screws.
install:
1) on 5.0 and 5.8 engines, position tps so pigtail points towards IAC valve.
2) secure tps to throttle body with retaining screws (11-16 inch lbs)
3) install throttle body
4) connect wiring
5) connect neg batt cable
EDIT: Do your fuel pumps prime when you turn the key (run for 2 sec) or do they keep running with the ignition set to "on?" Chances are there's a corroded wire or connection somewhere that the eec is picking up on.
Per Chiltons:
**disconnect neg batt cable**
1) disconnect tps harness
2) on 5.0 and 5.8 engines, you may need to remove the throttle body
3) disconnect wiring from the sensor
4) matchmark the tps and throttle body. remove the two retaining screws.
install:
1) on 5.0 and 5.8 engines, position tps so pigtail points towards IAC valve.
2) secure tps to throttle body with retaining screws (11-16 inch lbs)
3) install throttle body
4) connect wiring
5) connect neg batt cable
EDIT: Do your fuel pumps prime when you turn the key (run for 2 sec) or do they keep running with the ignition set to "on?" Chances are there's a corroded wire or connection somewhere that the eec is picking up on.
Senior User
Joined: Jan 2009
Posts: 219
Likes: 0
From: Maricopa, AZ
Try this:
REMOVAL & INSTALLATION
Edit: Virto's quicker than I am.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Installation is pretty straight forward, the part about rotating the sensor just means that you will likely have to first engage the sensor to the throttle shaft before it will fully seat, and the you will have to rotate the sensor body to line up the bolt holes. I think it will be pretty obvious when you do it.
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Thread Starter
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Junior User
Joined: Dec 2006
Posts: 62
Likes: 0
Advice: pick up a service manual. Even a Haynes/Chiltons is beyond helpful on these trucks.
Per Chiltons:
**disconnect neg batt cable**
1) disconnect tps harness
2) on 5.0 and 5.8 engines, you may need to remove the throttle body
3) disconnect wiring from the sensor
4) matchmark the tps and throttle body. remove the two retaining screws.
install:
1) on 5.0 and 5.8 engines, position tps so pigtail points towards IAC valve.
2) secure tps to throttle body with retaining screws (11-16 inch lbs)
3) install throttle body
4) connect wiring
5) connect neg batt cable
EDIT: Do your fuel pumps prime when you turn the key (run for 2 sec) or do they keep running with the ignition set to "on?" Chances are there's a corroded wire or connection somewhere that the eec is picking up on.
Per Chiltons:
**disconnect neg batt cable**
1) disconnect tps harness
2) on 5.0 and 5.8 engines, you may need to remove the throttle body
3) disconnect wiring from the sensor
4) matchmark the tps and throttle body. remove the two retaining screws.
install:
1) on 5.0 and 5.8 engines, position tps so pigtail points towards IAC valve.
2) secure tps to throttle body with retaining screws (11-16 inch lbs)
3) install throttle body
4) connect wiring
5) connect neg batt cable
EDIT: Do your fuel pumps prime when you turn the key (run for 2 sec) or do they keep running with the ignition set to "on?" Chances are there's a corroded wire or connection somewhere that the eec is picking up on.
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Thread Starter
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Junior User
Joined: Dec 2006
Posts: 62
Likes: 0
Well, I've done that once or twice. Once the tps is fixed, I'll blank the memory and switch tanks when the truck is off and see if that helps.
Fleet Mechanic
Joined: Apr 2008
Posts: 1,724
Likes: 2
From: Vancouver BC Canada
Eric (among others) has helped me in the past with a reaccurring 542 and through a little bit of trial and error, I have narrowed it down to switching tanks while the vehicle is running. Try only switching tanks when the truck is off for a little while and see if the codes stop.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
I wouldn't worry too much about the 542 in all honesty. If it doesn't come up until switching tanks with the engine running, you can just ignore that code when it comes up unless there is a dead fuel pump, but hopefully that won't take a code to figure out 
. 542 shouldn't turn on the check engine light, so if it's on, it's for something else 
.
. 542 shouldn't turn on the check engine light, so if it's on, it's for something else .
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