92 explorer code 543

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Sep 17, 2005 | 01:49 PM

marthabefd

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92 explorer code 543

secondary circut does this mean the pump is bad? or a short in the wiring?
i can hear the pump when the key is turned on. any help please thanks

Sep 17, 2005 | 03:50 PM

aggyaggy

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543 is a circuit malfunction .Check your inertia fuel shut-off switch and associated wires.Then check your fuel pump relay and its wiring.

Sep 17, 2005 | 06:12 PM

mrshorty

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From: UT

KOEO 543 or CM 543? A KOEO 543, and the pump running suggests that the wiring fault is between the computer and the actual fuel pump circuit. A CM 543 could indicate that the fuel pump circuit is intermittently cutting out.

Sep 18, 2005 | 08:24 PM

thelonerangerxlt

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Code 543 is "Fuel pump circuit open connection - ECA/Electronic Control Assembly to battery."

I'd suspect a bad FP relay, that's 'chattering' and giving an intermittant circuit. You can exchange the FP relay with the A/C clutch relay, to check it.

Sep 18, 2005 | 10:13 PM

Jharger

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From: Phoenix

No way. Not ever here in Phoenix where it is still 100+ highs in mid September would anyone want to sacrafice AC over an engine that actually runs.

Little humor folks...But I am still sweating my A thing off working in the garage.

I think the lone ranger speaks of good wisdom.

Sep 18, 2005 | 10:27 PM

marthabefd

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It is a CM code can I still exchange the ac relay for the fp?? any other
things to look for?? thanks

Sep 18, 2005 | 10:37 PM

marthabefd

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already cleaned the ground wires and cleared the codes. and replaced the battery just due to age no other reason. Do I just pull the ac relay and insert it in the fp slot?? thanks