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Old 06-14-2011, 08:49 PM   #1 (permalink)
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Default 94 sidekick fuel pump

If the fuel pump relay is clicking is the ECU unit working?????????????????????
I also changed relays
I jumped the fule pump at the pigtail under the tank fires right up
all connections behind tail light look fine
no power when it is all hooked back
If it was ground on tank I don't think it would fire with jumper
any help here
I have read on here til I'm crosseyed
thanks
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Old 06-15-2011, 04:13 AM   #2 (permalink)
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Clicking means that the ECU is going nuts, recycling. From your other post you advised that you jumped the fuel pump wiring to get the car going. As Bog indicated in that post, you most probably burned out the fuel pump transistor inside the ECU. You would have to pull the ECU and open it up to see if you find any burned out transistors. You probably haven't read this, however:
ECU relays clicking or FI fuse blown?
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Old 06-15-2011, 02:19 PM   #3 (permalink)
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when I jumped the fuel pump the wires to the ECU were disconected
I unpluged fule pump and sending unit at conection under tank and jumped to wires going into tank it starts right up
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Old 06-16-2011, 05:45 AM   #4 (permalink)
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You have fuel injected engine, yes? If you truly unplug the ECU, then the car would not start at all. If the car started, the ECU was still connected. You need to pull the ECU to see if you did any damage inside by hotwiring the pump.
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Old 06-16-2011, 10:34 AM   #5 (permalink)
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94kick
no profile ,no signature , no country, so are we to guess? oh, and door count is big time , important as the pump is wired different on 4doors.

Quote:
Originally Posted by lieingdog View Post
If the fuel pump relay is clicking is the ECU unit working?

repeated clicks on 1 click each key ON. ?
1 click key on, then 1 more click after 3 seconds is normal.?
or 1 click and motor starts, and then clicks with key off.?



I also changed relays (that was a waste of time)
I jumped the fuel pump at the pigtail under the tank fires right up
doing that and getting the wrong pin , blows up the ecu , that was bad.


all connections behind tail light look fine (use a thing called a volt meter)
no power when it is all hooked back
If it was ground on tank I don't think it would fire with jumper
any help here
I have read on here til I'm crosseyed
thanks
lets go back to line one. explain CLICKING fully.

linked off my dead ECU page is this
clicking
ECU relays clicking or FI fuse blown?
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Old 06-16-2011, 10:41 AM   #6 (permalink)
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the ECU can click for 2 reasons and 2 only
1: ECU bad
2: inputs and outputs to ECU shorted. ( this includes POWER feeds)

that page covers every way, possible and all ever posted here for 4 years.

even a shorted (has bad commutator inside and draws too much current)
fuel pump can overload a ECU.
a shorted O2 sensor power line on some years,unplug it.
a shorted ISC

the caps in the ECU, are bad . see dead ecu page.

keep in mind, a fuel pump has many failure modes.
dead
weak
shorted,
excess power demand.
or excess electrical noise. (can cause electronics on some cars to go nuts)

some of these fails , give good pressure at the output. (last 2)
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Old 10-30-2011, 06:52 PM   #7 (permalink)
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I just came across this post and am having a similar problem on my tracker 16v 1994 manual 2dr 4wd. The tracker sat for several months this summer while i was building the new engine. It was a runner just blown head gasket and high mileage. When i went to crank it up for the first time No fuel pump at all. I checked the main relay and the Fuel pump relay and they both seem to be cycling correctly. I jumped power down the pink wire and still no fuel pump. Pulled the tank the pump was ugly and faulty so i installed a new pump. manually powered it up and it works fine. But as soon as I plug the pig tail at the tail light or under the bumber skin in and turn the key on the fuel pump relay goes from what seems to be the correct cycling to the super fast clicking or cycling. I pulled the ecm out and removed it form the metal box. I saw no signs of heat smoke or anything else. I'm not blowing fuses on the FI circuit either. I'm wondering if since the tracker was a driver and the pump failed while sitting for a few months from what looks like moisture in the tank. Could it be as simple as the ecm trigger for the fuel pump has failed when i was attempting to crank it over for the first time and it was stuck or shorted? I just put the old pump in my vice and rn power to it and tried tapping it to see if I could get anything from it but it seems to be a open circuit not drawing any load. I was on kicks web site and started thinking ECM but I didn't see any thing wrong with it. I'm happy to send it off to David and have him go through it or update it any how but i'm pulling my hair out on how the ecm can make the FP relay cycle on and off so fast that power cant get to the pump and when i unplug the pump all looks like its working correctly on that circuit. Any help would be appreciated Jeff
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Old 10-30-2011, 07:13 PM   #8 (permalink)
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Left out a bit of info.
Also when i jump the 6 pin plug for codes on the 2 and 4 position I can not get any codes to flash the light is on all the time. I also flipped the mileage switch (NAG) and you can see it dim or brighten but its on all the time as well. Obviously the check light was on before as it had a blown head gasket so this is the first time i have started to look into any issues which I expected to be all gone with the new engine etc. It still ran decent before I pulled it apart as well. Thanks Jeff
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Old 10-31-2011, 06:31 AM   #9 (permalink)
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Jeff, you really should start your own post for the specifics of your car, rather than piggybacking on to an old post. Your fuel pump relay clicking is a sign that the ECU caps are bad and the ECU is cycling over and over:
ECU relays clicking or FI fuse blown?
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Old 10-31-2011, 08:32 AM   #10 (permalink)
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Quote:
Originally Posted by GeoJeff View Post
I just came across this post and am having a similar problem on my tracker 16v 1994 manual 2dr 4wd.
did you read my my licking relay page in dead ECU section.
if not, why not?
nor the ECu test same page , DEAD CEL.?

index 12
16v fast tbelt swap

The tracker sat for several months this summer while i was building the new engine. It was a runner just blown head gasket and high mileage. When i went to crank it up for the first time


No fuel pump at all. I guess you mean no buzz, and not real a guage.

I checked the main relay and the Fuel pump relay and they both seem to be cycling correctly. I jumped power down the pink wire and still no fuel pump.

Pulled the tank the pump was ugly and faulty so i installed a new pump. manually powered it up and it works fine. But as soon as I plug the pig tail at the tail light or under the bumber skin in and turn the key on the fuel pump relay goes from what seems to be the correct cycling to the super fast clicking or cycling.
(bad ECU, or bad power to ECU or pump not pulling 4amps but 12amps bad.)


I pulled the ecm out and removed it form the metal box. I saw no signs of heat smoke or anything else. I'm not blowing fuses on the FI circuit either.

I'm wondering if since the tracker was a driver and the pump failed while sitting for a few months from what looks like moisture in the tank.
NEVER EVER !

Could it be as simple as the ecm trigger for the fuel pump has failed when i was attempting to crank it over for the first time and it was stuck or shorted?
NO.

I just put the old pump in my vice and rn power to it and tried tapping it to see if I could get anything from it but it seems to be a open circuit not drawing any load. trash it, brushes long gone. fix your car.

I was on kicks web site and started thinking ECM but I didn't see any thing wrong with it.
You didnt read the part about dried out caps, they dry out with no signs
at all , a cap meter would show that, just replace the caps and be done with it. why leave them old POS caps in there....



I'm happy to send it off to David and have him go through it or update it any how but i'm pulling my hair out on how the ecm can make the FP relay cycle on and off so fast that power cant get to the pump and when i unplug the pump all looks like its working correctly on that circuit. Any help would be appreciated Jeff
the ecu is rebooting over and over like a machine gun
the only possible is:
bad ecu
bad power to ecu
or
overloaded ecu( shorted pump, shorted ISC coil, shorted VSV , shorted , 02 sensor on some years)

but............. all that is wasted words
you said the ECU will no blink
that is the DEATH OF ECU.
but can be over loaded too.... if its constantly rebooting it can do codes

unplug all loads while its clicking and see if one load , cures the clinking
if it does check the current draw or ohms resistance of bad load
the ISC is 12 ohms.
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