747 harness question...

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Jan 28, 2007 | 08:45 PM

V8Astro Captain

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747 harness question...

Is pin B2 (fuel pump signal) necessary on the 747? I'm making a harness and I'm trying to weed out all the non-essentials.

Jan 28, 2007 | 10:58 PM

Fast355

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From: Hurst, Texas

Car: 1983 G20 Chevy

Engine: 305 TPI

Transmission: 4L60

Axle/Gears: 14 bolt with 3.07 gears

Quote:

Originally Posted by V8Astro Captain

Is pin B2 (fuel pump signal) necessary on the 747? I'm making a harness and I'm trying to weed out all the non-essentials.

Not necessary

Just de-program the code 54 error flag, or you will get a constant SES light.

Jan 28, 2007 | 11:46 PM

V8Astro Captain

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Quote:

Originally Posted by Fast355

Not necessary

Just de-program the code 54 error flag, or you will get a constant SES light.

Thanks!

That's what I thought. I've never had to make a harness from scratch. I've done conversions and such where these little piddly things were already there.

Jan 29, 2007 | 02:10 PM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

IIRC the fuel pump voltage signal is used for the injector battery voltage compensation. It will work w/o this input as the 0 volts area of the table is set to the same as the 13-14 vots (or so) area.

But the injector PW will not be compensated for differences in vehicle voltage.

RBob.

Jan 30, 2007 | 11:59 AM

V8Astro Captain

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From: 600 yds out

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Does you EBL use this input for PW voltage correction? I plan on using that with this harness I'm making.

I just remembered that my fuel pump relay has two outputs. I can use that second output for this if I need to.