dtc:542 code

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Feb 29, 2012 | 08:36 AM

jonathan642

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dtc:542 code

i have a crank no start problem and the code came up dtc:542 any idea what this is?

Feb 29, 2012 | 10:32 AM

rla2005

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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.

Feb 29, 2012 | 10:34 AM

jonathan642

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Ok well I was just asking what the code ment on this one so calm your ***** but thanks anyway

Feb 29, 2012 | 10:59 AM

rla2005

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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.

Feb 29, 2012 | 11:02 AM

jonathan642

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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

Feb 29, 2012 | 12:19 PM

jonathan642

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But if your still willing to help do you k ow what could be causing this?

Feb 29, 2012 | 01:24 PM

rla2005

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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.