95 Bronco won't start

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Jeff Strickland - 19 Dec 2006 17:21 GMT

I started my Bronco yesterday. It ran for a second or two and died. Now, it
just cranks and cranks. The trouble codes (4 of them) say that each of three
different sensors have, "signal voltage is higher or lower than expected,"
and the Fuel Pump circuit has an open connection.

The three sensors are the Air Charge Temperature, Engine Coolant
Temperature, and Transmission Oil Temperature. A burned up fuel pump can
cause the open connection, but the sensor codes would not be caused by such
a malfunction.

Since the truck is stone cold from sitting in the driveway over night, I'd
expect the sensors to all give COLD readings -- whether that equates to a
high or low voltage is a mystery to me.

I haven't got a wiring diagram for my truck, but if the three sensors and
the fuel pump were all on the same circuit, then I'd be looking for a common
failure point. Does anybody here have the wiring diagram for a "95 Bronco?

I also wonder how to gain access to the fuel pump. Is there an access panel
in the floor of my truck, or do I have to drop the tank to get the pump out?

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Bill Schwab - 19 Dec 2006 17:46 GMT

Jeff,

> I also wonder how to gain access to the fuel pump. Is there an access
> panel in the floor of my truck, or do I have to drop the tank to get the
> pump out?

I can't be of any real help, except to mention that ceativity might pay
dividends. My 90 Sentra needed a new fuel pump a couple of years ago.
IIRC, Chilton said to drop the fuel tank, but the shop I had deal with
it ended up quickly yanking the back seat to get access to a panel, and
did the job through it. My hunch is that they worked through both the
cab and the trunk, but it saved them dropping the tank.

Bill

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Spdloader - 19 Dec 2006 23:35 GMT

The pump's in the tank, Jeff, and you'll have to drop the tank to get it
out. It's pricey if the pump is the problem.

Spdloader

>I started my Bronco yesterday. It ran for a second or two and died. Now, it
>just cranks and cranks. The trouble codes (4 of them) say that each of
[quoted text clipped - 18 lines]
> panel in the floor of my truck, or do I have to drop the tank to get the
> pump out?

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Mellowed - 23 Dec 2006 19:36 GMT

Spd,

I'm looking at this late, but, aren't there two pumps. The one in the
tank and another 'in-line' high pressure pump mounted somewhere on the
frame rail?

: The pump's in the tank, Jeff, and you'll have to drop the tank to get it
: out. It's pricey if the pump is the problem.
[quoted text clipped - 23 lines]
: > panel in the floor of my truck, or do I have to drop the tank to get the
: > pump out?

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Jeff Strickland - 23 Dec 2006 19:51 GMT

I haven't found this to be correct in my Bronco. I only have one pump that I
know of. If there's a second pump, it is not shown on the wiring schematics,
nor is it obvious when looking at the frame rails. I'll double check, but
the first glance did not reveal a second pump. Thanks for the thought though
...

> Spd,
>
[quoted text clipped - 41 lines]
> the
> : > pump out?

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Mellowed - 24 Dec 2006 14:55 GMT

Jeff,

I was mistaken. I was thinking about an older truck that I used to
have.

: I haven't found this to be correct in my Bronco. I only have one pump that I
: know of. If there's a second pump, it is not shown on the wiring schematics,
[quoted text clipped - 47 lines]
: > the
: > : > pump out?

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Spdloader - 23 Dec 2006 23:56 GMT

> Spd,
>
> I'm looking at this late, but, aren't there two pumps. The one in the
> tank and another 'in-line' high pressure pump mounted somewhere on the
> frame rail?

Just one in the tank on that truck, and a fuel filter on the frame rail.

Spdloader

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Jasper - 19 Dec 2006 23:52 GMT

Try this link:

http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0
a/3a/41/0900823d800a3a41.jsp

> I started my Bronco yesterday. It ran for a second or two and died. Now, it
> just cranks and cranks. The trouble codes (4 of them) say that each of three
[quoted text clipped - 16 lines]
> I also wonder how to gain access to the fuel pump. Is there an access panel
> in the floor of my truck, or do I have to drop the tank to get the pump out?

Reply to this Message

Jeff Strickland - 29 Dec 2006 21:10 GMT

The Trouble Code was 542, Fuel Pump Circuit Open (with a detail about the
ground-side that I forget at this instant).

I replaced the fuel pump and fuel filter for $198 in parts, and a few beers
for the labor of my brother in law. There were three other codes that were
all red herrings (false codes) that had nothing to do with reality.

Bottom line, it was a relatively easy job that required more muscle than
technical expertise.

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