Question about 1998 Chevrolet S-10 Pickup

8 Answers

2001 sio 2.2 eng ecm b fuse keeps blowing

Truck was runing fine, parked it, went out to start it, cranked but woulld not start, noticed fuel guage also was not reading, gear slector light also was not working, replaced ecm b fuse , ran for approx 5 mins. I shut off to see if restart was ok, blew fuse again , crank but no start again, remove fuel pump relay, install new fuse , would start and run til lost residual fuel pressure no blown fuse, replace with new fuel pump relay and same problem blows fuse ecm b fuse, is it fuel pump issue, seems to point to it... Intermitten fuel pump ? 38,000 miles on this 2001 S 10 2.2 litre eng...auto trans

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  • 17 more comments 
  • Jeff Phillips
    Jeff Phillips Aug 02, 2009

    How can you say un plug and replug in ecm as solution, did you not read the comment about fuse not blowing when fuel pump relay was out of the circuit, as mentioned , found popped 20amp ecm b fuse , went threw two 20 amp fuses that popped at turn of ignition switch before I got one 20 amp fuse to stay good enough to start engine and run for a few mins. Then I shut off motor and attempted to restart but it began popping fuses again. Fuel pumps are expensive for this truck anywhere from $280 to $750 depending on quality of manufacturer and quietness of pump...

    Truck has on 38,000 miles all highway and no rough riding. this is a sudden failure, truck was running absolutely fine before failure ...

  • Jeff Phillips
    Jeff Phillips Aug 02, 2009

    wanted to add it is a 2001 S 10 2.2 litre eng auto trans, give me location of ECM / PCM are they the same unit ? what causes sudden onset of failures of the ECM B 20 amp fuses...

  • Jeff Phillips
    Jeff Phillips Aug 03, 2009

    truck was runing fine, parked it, went out to start it, cranked but woulld not start, noticed fuel guage also was not reading, gear slector light also was not working, replaced ecm b fuse , ran for approx 5 mins. I shut off to see if restart was ok, blew fuse again , crank but no start again, remove fuel pump relay, install new fuse , would start and run til lost residual fuel pressure no blown fuse, replace with new fuel pump relay and same problem blows fuse ecm b fuse, is it fuel pump issue, seems to point to it... Intermitten fuel pump ? 38,000 miles on this 2001 S 10 2.2 litre eng...auto trans

    Comments:
    Aug 02, 2009 - How can you say un plug and replug in ecm as solution, did you not read the comment about fuse not blowing when fuel pump relay was out of the circuit, as mentioned , found popped 20amp ecm b fuse , went threw two 20 amp fuses that popped at turn of ignition switch before I got one 20 amp fuse to stay good enough to start engine and run for a few mins. Then I shut off motor and attempted to restart but it began popping fuses again. Fuel pumps are expensive for this truck anywhere from $280 to $750 depending on quality of manufacturer and quietness of pump...
    Truck has on 38,000 miles all highway and no rough riding. this is a sudden failure, truck was running absolutely fine before failure ...
    Aug 02, 2009 - wanted to add it is a 2001 S 10 2.2 litre eng auto trans, give me location of ECM / PCM are they the same unit ? what causes sudden onset of failures of the ECM B 20 amp fuses...

  • Jeff Phillips
    Jeff Phillips Aug 03, 2009

    The spare tire is at the very rear of the truck nowhere near any of the fuel pump wire harness ? I don't get why you would say check wires near a bracket located next to spare tire. Hmmmm...



    Any other suggestions , forgot to add this, upon intial fuse failure when truck would crank but not start fuel guage would not register and the highlight (Green Square ) used to show gear selection on cluster was not working either, now even with ecm b fuse blowing consistantly those units work. other words fuel guage reads and trans gear positon indicator light works, eng cranks but no start.



    those items did not work after initial failure which took place in key off positon or immediately upon activation of ign switch... Your Thoughts ?

  • Jeff Phillips
    Jeff Phillips Aug 03, 2009

    "You said the truck ran for 5 minutes with the new fuse and old relay."



    It took two attempts first replacement fuse blew also...

    It was after I replaced the fuse a second that it ran without blowing for a few minutes, again as explained I shutt of to check if problem solved but upon start attempt fuse blew 20amp ecm b, it subsequently blew about 6 more fuses without any success getting it running again...

  • Jeff Phillips
    Jeff Phillips Aug 03, 2009

    I have thought about checking the gray wire to the fuel pump with my ohmeter by attaching the + lead from the ohm meter to the gray + fuel pump 12 V source abd the neg ohm meter lead to the chasis ground to see if OL reads or if I get a 0.00 ohm reading indicating a short to ground, now your saying to also test the pump leads + and --- to see if I get a short , how about amp draw from the pump , how would you get a reading since an amp meter needs to be inline without splicing gray wire, I dont have a amp meter clamp type tester ...



    what did you think of the first techs idea of un plugging the ecm and re plugging ? did not make since to me at all,



    have you thought about the oil pressure switch as a potential issue ?

  • Jeff Phillips
    Jeff Phillips Aug 03, 2009

    see comments on s 10 ecm b 20 amp fuse blowing

  • Jeff Phillips
    Jeff Phillips Aug 03, 2009

    see comments

  • Jeff Phillips
    Jeff Phillips Aug 03, 2009

    see comments, no rust at all, can not access gray wire at fuel pump module without dropping fuel tank or raising truck bed....

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    okay, but what explains the truck starting and running fine after replacing the 20 amp ecm b fuse the second time , I having trouble understanding the reasoning of why all the techs are pointing to a short, in my many years of the repair of vehicles usally if a pump has become shorted it is completely shorted and not just intermittenly shorted, some times shorted and some times good ? as mentioned the truck ran for about five minutes after replacing the the ecm b fuse a second time after blowing upon intitial discovery of the original fuse failure... Maybe I did not explain the truck was running fine but not driven after replacing the second fuse to get it to run for the 5 min. span, so no wire harness or plugs were manipulated as to temperarily stop a shorted wire by movement of a wire or wires... if the pump was drawing to many amps and causing the initial problem of blowing the ecm b fuse it seems the the amp draw would be consistant and would not have allowed the one fuse to stay good long enough for the 5 min run session where everything was ok until I shut of and attempted to restart eng. now no fuses will hold up all blow at turn of switch to crank mode... help, not convinced yet, looking for someone else who has experienced same issue, is the a super experienced gm tech out there ??? no offense it's just that the repair is expensive , pump at $350 labor at $ 350...

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    thanks, was not trying to offend anyone at all, hope you understand, I have followed the wire harness from top to bottom it appears pristine as mentioned the truck has only 38,000 miles on it, not even dirty yet under the truck really... a gm tech says he has seen this exact same problem on a 07 trailblazer turned out to be a shorted lead to the pump inside the tank... will see it's time to remove the tank, I will inform you tomorrow sometime or the next day ... I also am a tech with 29 years exp and have seen some wierd stuff in my 29 years , this is not the weirdest at all... my email is

    centralvalleyconexion@yahoo.com email me in a day or so i will let you know the resolution maybe it will help someone else some time...

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    even if it is the sending unit and not the fuel pump both have to be replaced they only come in a module unit in a formed plastic housing , 95 and earlier models you can replace parts individually but not 96 and later... probably made GM more money and as well the labor it takes to remove it from the tank it probably made sense to just do both and also change the filter...

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    you mean your in this for the money ?

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    see all comments

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    THE PROBELM HAS BEEN SLOVED, NO ONE WAS EXACTLY CORRECT, SOME WERE CLOSE, THE PROBLEM WAS NOT THE FUEL PUMP AT ALL OR THE WIRE HARNESS TO THE PUMP, THE PROBLEM WAS THE BLUE WIRE ON THE FUEL SENDING UNIT AND THE SLIDE CONTACTS OF THE FUEL GUAGE REGISTER , IT WAS BURNT AT THE REASTAT ON THE FUEL LEVEL SWING ARM ,IT WAS NOT BURNT IN TWO BUT WAS ENOUGH TO CAUSE A VERY HIGH RESISTANCE ENOUGH TO POP THE FUSE, AND THE REASON IT RAN ONCE WAS THE TRUCK WAS ON A INCLINE WHICH MOVED THE FUEL LEVEL SWING ARM JUST OFF OF THE BURNED SPOT ON THE SLIDE CONTACTS ( REASTAT ) BUT ON LEVEL GROUND IT WILL POP EVERYTIME, SO IF ANYONE RUNS INTO THIS PROBLEM AGAIN TAKE TIME TO JACK THE *** END OF THE TRUCK UP TO SEE IF IT STOPS THE POPPING OF THE FUSE, IF IT DOES THERE'S ABOUT A 99% CHANCE IT IS THE FUEL SENDING UNIT AND NOT HE PUMP OR PUMP HARNESS. THIS WAS ALL A TEST IT COST ME $12.99 TO SEE IF ANY TECHS WERE ABLE TO SOLVE THIS ISSUE, NOW YOU CAN SAY THANK YOU... PEACE OUT...

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    GO BACK AND REREAD THE COMMENTS NOWHERE DOES IT SAY THE PUMP WAS EVER REPLACED, IT SAYS THE FUEL PUMP RELAY WAS REPLACED, NEVER THE PUMP...

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    THE TRUCK IS A 2001 S 10 2.2 LITRE WITH ONLY 38,000 MILES , NO WHERE NEAR 100,000 MILES YET... BOUGHT IT WITH 19,000 A YEAR AND HALF AGO...

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    how do you sign up I want to get paid too ? I am more than qualified to assist in sloving these mechanical issues... please let me know then I will rate you.... my email centralvalleyconexion@yahoo.com

  • Jeff Phillips
    Jeff Phillips Aug 04, 2009

    thanks to emmisionwiz...

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8 Answers

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  • Chevrolet Master
  • 76,846 Answers

You have shorted or burned fuel pump wiring harness, did you replace the pump connector? there are TSB"S on this problem, the burned connector for the pump causes excessive current draw and can cause the fuse to blow, also the reason they went to a module was not money, it ws to eliminate the problem of slosh and the excessive fuel pump wear and loss of pressure during cornering with a resultant hesitation, the fuel pump is very small and is cooled by the gas it sits in, so if the gas sloshes away from the pump it gets hot very fast and that shortens the life of the pump, this causes premature failures.

Posted on Aug 04, 2009

  • 2 more comments 
  • yadayada
    yadayada Aug 04, 2009

    I would have included/recommended the pump as the problem but saw that you had replaced the pump in a previous repair, in fact re-wrote my solution to leave the pump out, the pump and the wiring connector are known faults in the truck after about 100,000 miles.

  • yadayada
    yadayada Aug 04, 2009

    did you damage the wiring during installation of the pump module??

  • yadayada
    yadayada Aug 04, 2009

    thought the pump was replaced, guess i mis-read it, well no matter what the fuel pump wiring in the tank had to be repaired or better yet replaced, don't quite understand your motives, but not seeing the truck first hand I correctly diagnosed the problem was in the fuel pump module, so at the shop the fuel tank would have been dropped and the fuel pump module (which includes sending unit as you know) would have been replaced, GM does not pay to repair the module only to replace it under warranty, if it was a non warranty issue like your truck I still would have replaced the module most likely, but without seeing exactly what the wiring issue was that is a question mark. in any event the diagnosis was correct, th fuel pump circuit was the problem.



    Please rate this diagnosis for one of the experts (me I hope) so we can be compensated for our time, we do like the money end of this work, but I answer 20 times as many free forum questions as pay ones..

  • yadayada
    yadayada Aug 04, 2009

    CHECK YOUR EMAIL IN-BOX, HAVE SEND THE INSTRUCTION PAGE FOR BECOMING AND EXPERT WITH FIXYA. PLEASE RATE MY HELP A "FIXYA" THANKS

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  • Master
  • 521 Answers

Internal short in the fuel pump or at the harness connector on top of the fuel tank.

Posted on Aug 03, 2009

  • Rob Bruce Aug 04, 2009

    Again short in the fuel pump but I imagine that not a single one of us who have told you this will get paid. cool. bzzzzzzt not cool.

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  • Chevrolet Master
  • 5,546 Answers

Check the wires leading from the fuel pump. I understand some wires break under a bracket behind the spare tire.

Save the old relay since the new fuse blew, the old relay was probably good too!

The only thing that changed from when you parked the truck was turning the ignition key. You said the truck ran for 5 minutes with the new fuse and old relay. Then you shut the truck off. Then you wanted to check with restart and blew the first new fuse. You removed the old relay and put in a second new fuse and the engine started and ran until it ran out of gas. When you put in a new relay you blew the fuse again trying to start it.

It sounds like either the wire to the fuelpump grounded or the fuel pump is bad.

Posted on Aug 03, 2009

  • fordexpert Aug 03, 2009

    Can you unplug wires to fuelpump and check those wires with ohmmeter with battery disconnected?



    If the positive fuelpump wire makes a connection anywhere to the ground it should give you a circuit if it is faulty. With the wires off the pump you would isolate the pump. This way you will know whether the wires are bad before the pump or if the pump is blowing the fuses.



    A lot of the other lighting problems are probably reactions to the stray voltage in the truck.

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  • Master
  • 2,187 Answers

The fuse blowing out is normally a cause of electricity flowing higher than the rating of the fuse which should not be higher than the allowed current to pass to the devices connected after it. This high surge may be caused by the lead attached to the fuse which can be you fuel pump is taking in more current due to increase in load or a short circuit. I fear the latter may have occurred trace the wires and check if there are loose connections, corroded wires that may need replacing and check the fuel pump relay also found when you trace the wire until you reach the fuel pump just to isolate the problem and ensure that you have pinpointed the issue.

Posted on Aug 04, 2009

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  • Master
  • 1,011 Answers

I think testing the gray wire a ohm meter is a good idea to check for a short. This is diffidently a wire issue or shorted fuel pump or sending unit If the sending unit on top of the gas tank is rusted i have seen short to power from this sending unit .Ya the unhook ecm thing will not work .I figure that is possible with that low of miles the truck must sit quite a bit so rust could be a issue.:)

Posted on Aug 03, 2009

  • mike loshbough
    mike loshbough Aug 04, 2009

    If you cant check the gray wire which you can get to in the wiring harness along the frame rail to check resistance to ground,then your just guessing because this is a very rare problem .You need a wiring diagram to start tracing down your problem .I have 26 years has a ASE master tech.I have run into a shorted sending unit do this before including running for a few minutes .It doesn't have to be a direct short just enough to get the resistance higher thus increasing the amperage.Well sorry this is all i got:)

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  • Contributor
  • 296 Answers

HI, Well my friend the problems you described indicate towards the fuel pump so in my view it indeed a fuel pump issue.You need to either get it repaired wll or get it replaced.It will surely fix the problem.
Thanks! mannu_rakesh

Posted on Aug 03, 2009

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  • Chevrolet Master
  • 2,359 Answers

The first thing you should do is to locate the oil pressure switch/sending unit.

It's a single wire terminal with plastic connect sensor from the engine block.


This oil switch is about $30.


This switch serves two functions.

1) provide oil pressure reading

2) disable the fuel pump relay in event of oil pressure loss.

===

When this switch is failing to provide the correct pressure to the ECU. The wiring harness can overheat and eventually create a short.

ECM B blow is because the harness is grounding/shorting.

===

DO NOT drive the truck until you change the oil pressure switch.

After you change the switch,you should spend sometime to inspect the wiring between the fuel pump relay,ECU and fuel pump.


Please post up day on the comment window/page.

I will follow up on it later.


Good luck.

Posted on Aug 03, 2009

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  • Master
  • 15,935 Answers

Unplug and re-plug the ECM - sounds like a bad connection or bad ground elsewhere.

Posted on Aug 02, 2009

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