dtc:542 code
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
This is your third new thread for the same issue. DTC 542: Fuel pump circuit failure
The PCM is sensing a problem with the fuel pump circuit, open or short.
Your other threads:
https://www.ford-trucks.com/forums/1...-starting.html
https://www.ford-trucks.com/forums/1...-starting.html
Please stick to one thread.
The PCM is sensing a problem with the fuel pump circuit, open or short.
Your other threads:
https://www.ford-trucks.com/forums/1...-starting.html
https://www.ford-trucks.com/forums/1...-starting.html
Please stick to one thread.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
We are trying to help you, but if you keep starting new threads for more or less the same issue then it becomes very difficult to keep track of what is going on and what has been checked/repaired/etc.
Your flippant remark will not gain you many friends here. I wish you well.
Your flippant remark will not gain you many friends here. I wish you well.
Thread Starter
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New User
Joined: Feb 2012
Posts: 22
Likes: 0
Sorry man but this one was just for the code since you seem to know alot I guess I could have just added another comment on there with the question but I was in a hurry to figure it out. But besides that. Thank you
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Code 542 can be caused by switching between the two tanks with the key in the On position or while the engine is running.
Depending on when the error was displayed it can mean slightly different things.
KOEO:
DTC 95/542 indicates that one of the following has occurred:
No Start:
-- Inertia Fuel Shutoff (IFS) switch not reset or electrically open (if in secondary circuit).
-- Open circuit between the fuel pump and FPM circuit connection to the power-to-pump circuit.
-- Poor fuel pump ground.
-- Fuel pump electrically open.
Engine Starts:
-- Fuel pump secondary circuit short to power.
-- Fuel pump relay contacts always closed.
-- Open in FPM circuit between PCM and connection to the power-to-pump circuit.
-- Damaged Powertrain Control Module (PCM).
If it was displayed in Continuous Memory (CM):
-- Fuel pump circuit activated when PCM expected circuit to be off (i.e. fuel system test or prime procedure).
-- Inertia fuel shutoff switch reset (if in power-to-pump circuit).
-- Open circuit in or between the fuel pump and FPM circuit at the PCM
-- Poor fuel pump ground.
-- FPM or power-to-pump circuit short to power.
-- Fuel pump relay contacts stuck closed.
Depending on when the error was displayed it can mean slightly different things.
KOEO:
DTC 95/542 indicates that one of the following has occurred:
No Start:
-- Inertia Fuel Shutoff (IFS) switch not reset or electrically open (if in secondary circuit).
-- Open circuit between the fuel pump and FPM circuit connection to the power-to-pump circuit.
-- Poor fuel pump ground.
-- Fuel pump electrically open.
Engine Starts:
-- Fuel pump secondary circuit short to power.
-- Fuel pump relay contacts always closed.
-- Open in FPM circuit between PCM and connection to the power-to-pump circuit.
-- Damaged Powertrain Control Module (PCM).
If it was displayed in Continuous Memory (CM):
-- Fuel pump circuit activated when PCM expected circuit to be off (i.e. fuel system test or prime procedure).
-- Inertia fuel shutoff switch reset (if in power-to-pump circuit).
-- Open circuit in or between the fuel pump and FPM circuit at the PCM
-- Poor fuel pump ground.
-- FPM or power-to-pump circuit short to power.
-- Fuel pump relay contacts stuck closed.
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New User
Joined: Feb 2012
Posts: 22
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Iv figured out that the ground is not working on the fuel pump relay. Do you know what wire that is?
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