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Trouble code 542. KOEO 542,yes. 1994 f250 460 7.5l. Checked…

Customer Question
Trouble code 542 Mechanic's...

Trouble code 542

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

KOEO 542,yes

Mechanic's Assistant: What is the model/year of your Ford?

1994 f250 460 7.5l

Mechanic's Assistant: Are you fixing your F250 yourself? What have you tried so far?

Yes. Checked the relay, inertia switch and tank selector

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Doesn't start

Submitted: 6 months ago.Category: Ford
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Answered in 5 minutes by:
3/19/2018
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 6 months ago
HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 6,762
Experience: 28 years Auto experience, Ford ,GM, Chrysler, Asian & European
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Hello, and thank you for using Just Answer! My name is***** me a few moments to review your question and Ill do my best to assist you.

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Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 6 months ago

Hello, have you checked the fuel pump inertia switch, is it a single or dual tanks? Do you hear the fuel pump run? Will it run if you spray some carb cleaner into the intake?

Diagnostic Trouble Code (DTC) 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 Fuel Pump Monitor (FPM) circuit connection to the power-to-pump circuit.
  • Poor fuel pump ground.
  • Fuel pump electrically open.

Engine Starts:

Yes --Go to J11. See: J11 - Verify That Fuel Pump Is Off

No --Go to J15. See: J15 - Check Inertia Fuel Shutoff (IFS) Switch

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Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 6 months ago

Do you need more help or information?

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Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 6 months ago

Hello?

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