fuel pressure monitor circuit help please
#1
02-05-2006, 11:18 AM
Join Date: Mar 2004
Location: SE MI ... U.S.A.
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fuel pressure monitor circuit help please
Hello all,
1994 Explorer 138K on the clock.
I continuousdly get the KOEO code of 543.
Had CM of 543 but erase it.
So I am tracing a monitoring wire to the pcm.
Fuel pump runs and I have no issues. buT I am trying to locate were the DG/Y wire goes from the distribution to the PCM.
Where is the PCM and what is the routing from the distribution block?
ANy place in particular subjective to corrosion on this wire?
1994 Explorer 138K on the clock.
I continuousdly get the KOEO code of 543.
Had CM of 543 but erase it.
So I am tracing a monitoring wire to the pcm.
Fuel pump runs and I have no issues. buT I am trying to locate were the DG/Y wire goes from the distribution to the PCM.
Where is the PCM and what is the routing from the distribution block?
ANy place in particular subjective to corrosion on this wire?
Last edited by Mic_bug; 02-05-2006 at 11:21 AM.
#2
02-06-2006, 12:14 PM
Join Date: Mar 2004
Location: SE MI ... U.S.A.
Posts: 52
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New info added
Some new info. I metered from pin 8 on the PCM connector back to the relay terminal and I get continuity. This same DG/Y splices to the inertia switch and powers the pump.
I am getting power to the pump, but the pcm is NOT seeing the power.
What gives? PCM going bad?
I ran a engine running test after warm up, and I still get a 543 code in KOER or in the KOEO (prior to seperator pulse).
I am getting power to the pump, but the pcm is NOT seeing the power.
What gives? PCM going bad?
I ran a engine running test after warm up, and I still get a 543 code in KOER or in the KOEO (prior to seperator pulse).
