94 ford throwing a code
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94 ford throwing a code
Does anyone happen to know what this means “542 open circuit in fuel system eec to ground” hooked a computer up to my truck and this is the code that came up I posted on her about my truck before being a no start they finally got everything figured out enough to get a computer hooked to my truck to read the computer in my truck and that code Is what they got??
Cross-Country
Joined: Apr 2020
Posts: 94
Likes: 5
From: Montana
Welcome back Shealyn,
Her vehicle has a 302. Just recently she has replaced almost everything new under the hood including the engine, wiring harness, sensors etc etc. The truck holds sentimental value to her.
There was quite a long thread about her truck a little while back. Her and her boy friend never gave up and finally found the problem. I think that a wire has come loose or a connection. If some one with a 94 302 wiring diagram can help her she would be very appreciative.
Her vehicle has a 302. Just recently she has replaced almost everything new under the hood including the engine, wiring harness, sensors etc etc. The truck holds sentimental value to her.
There was quite a long thread about her truck a little while back. Her and her boy friend never gave up and finally found the problem. I think that a wire has come loose or a connection. If some one with a 94 302 wiring diagram can help her she would be very appreciative.
Lead Driver
Joined: Jan 2019
Posts: 5,081
Likes: 865
From: N.W. Alabama
see subfords post #29 about ground, with pic, in her other thread.
94 ford won’t start - Page 2 - Ford Truck Enthusiasts Forums
94 ford won’t start - Page 2 - Ford Truck Enthusiasts Forums
Cross-Country
Joined: Apr 2020
Posts: 94
Likes: 5
From: Montana
Since I know next to nothing about wires or electricity, private message subford he knows everything
there is to know about electrical circuits and electronics. He can solve your problem very easily.
there is to know about electrical circuits and electronics. He can solve your problem very easily.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
542 most of the time is a bad fuel pump or has had a bad fuel pump in the last 80 startups if the battery has not been disconnected.
From the manual.
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 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.
-- Left/front HO2S short to power (dual HO2S applications).
-- Damaged Powertrain Control Module (PCM).
A 1994 and a 1995 are wired the same, here is a wiring for a 1995.
Attachment 278424
/
From the manual.
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 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.
-- Left/front HO2S short to power (dual HO2S applications).
-- Damaged Powertrain Control Module (PCM).
A 1994 and a 1995 are wired the same, here is a wiring for a 1995.
Attachment 278424
/
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