Fuel Pump Relay Clicking to prime

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Jeepster - 03 Dec 2006 22:41 GMT

I have a 94 GCL, and am stumped with a fuel problem. I have sense
changed the relay, filter and pump, and have not fixed the problem.
When i turn my ignition to st start position and leave it there,
depending on the temp. 5-40 mins. the fuel pump relay will begin to
click rapidly then slow down eventually quitting in which case the
check engine light copmes on and the fuel pump finally pre primes then
i can start it. I've heard that this may be in the case of a fauly
crank position sensor. I was looking for any other possible insight or
experience with this same problem.

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DougW - 04 Dec 2006 19:34 GMT

> I have a 94 GCL, and am stumped with a fuel problem. I have sense
> changed the relay, filter and pump, and have not fixed the problem.
[quoted text clipped - 5 lines]
> crank position sensor. I was looking for any other possible insight or
> experience with this same problem.

The 94 wiring is same as my 93.

The fuel pump and automatic shut down relays are fed by the ignition switch
and the ground is controlled by the computer. Apart from a failing sensor,
you could have corrosion in the harness or computer connector, or even a
faulty computer. Let's start with the codes.

What codes are you getting? http://revbeergoggles.com/engine_codes.html

Did you also check the fuses? There are three F3(20A), F8(60A), F15(30A)
in the power distribution block behind the battery.

Signature

DougW

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Jeepster - 05 Dec 2006 00:21 GMT

> > I have a 94 GCL, and am stumped with a fuel problem. I have sense
> > changed the relay, filter and pump, and have not fixed the problem.
[quoted text clipped - 19 lines]
> --
> DougW

Thanks man, but i haven't hooked it up to a diagnostic yet. that will
be done wed. the 6. i thought this would have been something more
simple but i guess it never is. Oh well thanks for the list of codes
though that will be very helpful. I'm begining to lean towards the pcm
my self. or a bad ignition. All the fuses are good ad i have changed
the relay. I am also off the cps as wll being is i found an order of
ignition opperations list adn it comes after the ernergizationof the
fuel pump relay. One more thing though i did botice a bust in the
return anti=-freeze hose beside the engine temp. sensor and some anti
freeze hit the sensor for sure. do you think this could have ruined the
sensor adn is keeping the pcm from activating the fuel pump. look in
this list and see what you think you opbviouslly know more about thiis
issue than i do and i appreciate all of your help. especiall after only
posting it last night.

Ignition Switch On:

This is an OPEN LOOP mode. When the SFI system is ACTIVATED by the
ignition switch, the following actions occur:

The PCM prepositions the idle air control (IAC) motor.
The PCM reads atmospheric air pressure from the manifold absolute
pressure (MAP) sensor and calculates the basic fuel strategy.
The PCM monitors the throttle position sensor (TPS) and engine coolant
temperature (ECT) sensor input. The PCM uses these inputs to modify
fuel strategy.
Intake air temperature (IAT) sensor is monitored.
ASD relay is energized for 3 seconds.
Fuel pump is energized for 1 second, unless engine is running or
cranking.
Oxygen sensor heating element is energized.

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Jeepster - 05 Dec 2006 01:29 GMT

Also do you happen to know the id # for the computer of a 93 jeep 4.0L6
auto my 94 was a typo it is actually a 93 or maybe what all years
computers will work on mine

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DougW - 05 Dec 2006 03:14 GMT

> Also do you happen to know the id # for the computer of a 93 jeep
> 4.0L6 auto my 94 was a typo it is actually a 93 or maybe what all
> years computers will work on mine

That depends on where you bought the vehicle and what production run
it was. 93 had several computers. Your fairly much stuck with that
year as they made quite a few changes in 94/95.

Go here, enter your vehicle info, then
go down Electrical/Powertrain control/Ecm
http://www.chryslerpartsdirect.com/

The part number is on a paper tag on the front of the ecu.
Kinda hard to see and sometimes it does fall off. I think
the part number is also engraved in the ecu case.

Signature

DougW

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Jeepster - 06 Dec 2006 22:59 GMT

ECM, All Models, 4.0L, Manual Trans, California, w/RFI 1993 $255.00
$198.90
To Determine Early And Late Built Vehicles Check 12th Digit Of The VIN
Number. Early Vehicles Have a "1" And Late Vehicles Have a "5" Or
Higher Number. Parts And Prices Are For Estimating Purposes Only.

Federal or non Federal. What does that mean, and also does it matter if
mine is a late or early vehicle because it is a late with a 12th digit
of 5

thanks doug
Dan

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Jeepster - 10 Dec 2006 21:09 GMT

hey man i got codes

12 Direct battery input to PCM was disconnected within the last 50
Key-on cycles
54 No camshaft signal detected during engine cranking.
55 Completion of fault code display on Check Engine lamp.

Do you think that the cam shaft sensor could be the problem being as it
is not detected during cranking.

Thanks
Dan

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Mike Romain - 10 Dec 2006 21:20 GMT

Yes, that is a problem. My son's van was recently dead with a code 54.
It needed a new pickup inside the distributor. I would try cleaning
it's electrical connection first though.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
(More Off Road album links at bottom of the view page)

> hey man i got codes
>
[quoted text clipped - 8 lines]
> Thanks
> Dan

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DougW - 10 Dec 2006 22:11 GMT

> Yes, that is a problem. My son's van was recently dead with a code
> 54. It needed a new pickup inside the distributor. I would try
> cleaning it's electrical connection first though.

Ditto. Clean the connector first. Also check to see that the
rotor doesn't move side to side or the distributor is full of oil.
Since to fix that is most often a new distributor and new distributors
come with a new camshaft position sensor.

>> hey man i got codes
>>
[quoted text clipped - 5 lines]
>> Do you think that the cam shaft sensor could be the problem being as
>> it is not detected during cranking.

Not a difficult part to replace but you do have to do some minor surgury.

http://www.revbeergoggles.com/camshaftps/
Never did finish a webpage, but the idea and pictures are there
for doing the 93ZJ 4.0.

Removal and reinstall is the same as a new distributor.
http://revbeergoggles.com/distributor/

Signature

DougW

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