Question about 1998 Chevrolet S-10 Pickup

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My pcm fuse blows every time i turn on the switch but if a remove my fuel pump relay switch the pcm fuse does not blow 03 alvalanche

Pcm fuse blows when turning on ignition but if i remove the fuel pump relay switch it does not blow

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  • Contributor
  • 27 Answers

Fuel pump is bad,your relay will be also from trying to start pump.there is an outside chance your relay is bad,easier to change that first

Posted on Nov 21, 2014

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Posted on Jan 02, 2017

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SOURCE: 1987 chevy r10 won't start

Assuming it is a fuel problem I checked at the carb. to be sure no gas was being pumped through the filter located under the power steering pump then the fuse on my 87 s10 was the ECM fuse.then check for the relay to click and the had to replace the oil pressure sending unit and mine started right up..the oil pressure must be about 4 lbs for the Pump tp operate...I loosened the fuel line to ck. for fuel but thats living dangerously...a pressure guage would be on the safe side......

Posted on May 18, 2009

  • 10 Answers

SOURCE: fuel injecter fuse blow imeditaly when ignition turn on

sounds like a short in the wiring from the fuse and the fuel injector junction block. GM like most fuel injection systems control injector firing by the computer providing ground to each injector in pairs or individually. The fuel injector fuse provides power to the injectors using splices therefore enabling one wire to feed 6 injectors. A shorted wire at any of these wires will blow the fuse. On one rare incident I found a faulty computer caused the fuse to blow. A shorted injector will just cause a rough running problem due to the injector stuck either open or closed.

Posted on Aug 05, 2009

mrjfisher
  • 141 Answers

SOURCE: 1991 chevy cavalier- stopped running going down

Sounds Like you have a defected pump. Or the wires to it may have gotten pinched. The fuse is showing you an over load. DUE TO FIRE !!!
( Don't use a over size fuse it can start a fire! )
You are going to need to start by dropping the tank. Check all wires around the tank. You are looking for bare wires. Then remove fuel pump check all wires going in to tank & wires in the tank. Now with fuel pump out check the wires on the fuel pump.
Now you that you have checked the wire and all are were good take the fuel pump back and tell them what is going on. They should test it.

Posted on May 31, 2010

  • 118 Answers

SOURCE: car wll not start ECM 20 amp fuse next to fuel

fuel pump is bad. pump motor is shorted.

Posted on Dec 08, 2010

  • 501 Answers

SOURCE: I have chevy silverado 2003.

Well the fuel level to your guage is controlled by the fuel level sending unit/sensor this should not cause your pcm to blow a fuse. There is a short somewhere else that is causing this. I would suggest taking it to an auto electric shop who can easily identify the problem area with a short/open circuit tester. Not too sure about the shops in your area but I would usually charge around $75 for that test plus parts & addl labor to give you some kind of idea. Trying to determine a wiring problem blindly is not a fun and can be a very time consuming task. You would have to consider possibly checking all inputs into your pcm as the problem occurs with a digital multifunction meter to determine the circuit causing the problem as well as potentially checking all the wiring in your fuel delivery system as well

Posted on Feb 23, 2011

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3 Answers

90 lesabre limited Fuel pump fuse blows every time I start the car It's a 20a fuse, I'm not even sure if it's a final pump fuse I can't find any diagrams showing what is what. Right side of dash


20 AMP is a big fuse, I would say its the fuse to the motor check this web site http://www.beijing-fanyi.com/1990/1990-buick-lesabre-wiring-diagrams

Apr 04, 2017 | Cars & Trucks

1 Answer

WHEN I TURN ON THE IGN SWITCH TO START POSITION I KEEP BLOWING THE FUEL PUMP FUSE BUT WHEN I REMOVE THE INJECTOR RELAY IT DONT BLOW THE FUSE


I would think that either the power wire feeding the pump or the pump itself is grounded and causing the fuse to blow. Pulling the injector relay is opening the circuit and not feeding power to the pump would be why it doesn't blow the fuse when it is removed.

Aug 12, 2015 | 1999 Mazda 626

1 Answer

Auto shut down fuse blows when I start the truck?


This information is straight out of the 1997 Breeze/Stratus/Cirrus Factory Service Manual (Yes I paid the $90 for it years ago)

__________________________________________________ _______________

Automatic Shutdown (ASD) sense - PCM Input

The ASD sense circuit informs the PCM when the ASD relay energizes. A 12 volt signal at this input indicated to the PCM that the ASD has been activated. This input is used only to sense that the ASD relay is energized.
When energized, the ASD relay supplies battery voltage to the fuel injectors, ignition coils, and the heating element in each oxygen sensor. If the PCM does not receive 12 volts from this input after grounding the ASD reley, it sets a Diagnostic Trouble Code (DTC).

Automatic Shutdown Relay - PCM Output

The PCM operates the Automatic Shutdown (ASD) relay and fuel pump relay through one ground path. The PCM operates them by switching the ground path for the solenoid side of the realys on and off. Both realys turn on and off at the same time.
The ASD relay connects battery voltage to the fuel injectors and ignition coil. The fuel pump relay connects battery voltage to the fuel pump.
A buss bar in the power distribution center (PDC) supplies voltage to the solenoid side and contact side of the relay. The ASD relay power circuit contains a 20 amp fuse between the buss bar in the PDC and teh relay. The fuse also protects the power circuit for the fuel pump relay and pump. The fuse is located in teh PDC.
The PCM controls the relay by switching the ground path for the solenoid side of the relay on and off. The PCM turns the ground path off when the ignition switch is in the Off position. When the ignition switch is in the On or Crank position, the PCM monitors the crankshaft position sensor and the camshaft position sensor signals to determine engine speed and ignition timing (coil dwell). If the PCM does not receive the crankshaft position sensor and camshaft position when the ignition switch is in teh Run position, it will de-energize teh ASD relay.
The ASD relay and fuel pump relay are located in the PDC near the battery. The inside top of the PCD cover has a label showing relay and fuse location.

ASD and Fuel Pump Relays

The following description of operation and tests apply only to the Automatic Shutdown (ASD) and fuel pump relays. The terminals on the bottom of each relay are numbered.

'------------------'
' __85 ___________'
' __87A '87 '30 ___' Sorry for the crudeness of this. This is supposed to
' __86 ___________' be the relay terminals!
'------------------'

OPERATION
- Terminal number 30 is connected to battery voltage. For both the ASD and fuel pump relays, terminal 30 is connected to battery voltage at all times.
- The PCM grounds the coil side of the relay through terminal number 85.
- Terminal number 86 supplies voltage to the coil side of the relay.
- When the PCM de-energizes the ASD and fuel pump relays, terminal number 87A connects to terminal 30. This is the Off position. In the off position, voltage is not supplied to the rest of the circuit. Terminal 87A is the center terminal on the relay.
- When the PCM energizes the ASD and fuel pump relays, terminal 87 connects to terminal 30. This is the On position. Terminal 87 supplies voltage to the rest of the curcuit.

TESTING
The following procedure applies to the ASD and fuel pump relays.
(1) Remove relay from connector before testing.
(2) With the relay removed from the vehicle, use an ohmmeter to check the resistance between terminals 85 and 86. The resistance shoud be 75±5 ohms.
(3) Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity between terminals 30 and 87A.
(4) Connect the ohmmeter between between terminals 87 and 30. The ohmmeter should not show continuity at this time.
(5) Connect one end of a jumper wire (16 guage or smaller) to relay terminal 85. Connect the other end of the jumper wire to the ground side of a 12 volt power source.
(6) Connect on end of another jumper wire (16 guage or smaller) to the power side of the 12 volt power source. Do not attach the other end of the jumper wire to the relay at this time.

WARNING: DO NOT ALLOW OHMMETER TO CONTACT TERMINALS 85 OR 86 DURING THIS TEST.

(7) Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohmmeter should now show continuity between relay terminals 87 and 30. The ohmmeter should not show continuity between relay terminals 87A and 30.
(8) Disconnect jumper wires.
(9) Replace the relay if it did not pass the continuity and resistance tests. If the relay passed the tests, is operates properly. Check the remainder of the ASD and fuel pump curcuits.

__________________________________________________ _______________

I know you said you replaced the relay, and this is a test procedure for the relay, but I have bought bad parts in the past. The description before the test procedure at least gives you an idea of what components are wired through and controlled by the relay. One of those may be faulty. Email me if you want or need wiring diagrams and I should be able to scan them and email them to you.

Jul 15, 2015 | 1992 Dodge Dakota

1 Answer

I have 1999 Pontiac grand am, my fuel pump fuse blows out whenever the ignition switch is turned. Do anyone have any suggestions on the problem?


When you turn the key on, it sends power to a relay. On the back end of the relay would be the computer for the engine computer. Which controls the fuel pump. Basically telling the computer, I am requesting fuel. Since the fuse blows, the possibilities are a bad wire from the fuse to the relay. A bad relay. A bad wire from the relay to the computer. A bad computer. First pull relay in the panel,turn it on. If it doesn't blow the fuse, You have eliminated one wire. If it does, fix that wire. Then swap the relay with another in the panel, if it doesn't blow a fuse, replace the relay. If it does , then remove the two plugs from the computer(under the dash on the drivers side). If it still blows a fuse, fix the wire from the relay to the computer. If it doesn't blow the fuse. Replace the computer.

Nov 11, 2014 | Cars & Trucks

1 Answer

Blown fuse pcm


It is possible that the fuel relay is faulty and causing excessive current through the pcm fuse which is blowing because of the excessive current draw to the relay.

Mar 28, 2014 | 2003 Chevrolet Avalanche

1 Answer

PCM fuse keeps blowing


It's possible you ran the battery down, trying to start? Have to make sure battery has a full charge and battery connections all good. If battery is down, have to use a charger and get it charged, we can't test anything if battery is down.
I did look at power distribution wiring diagram for your vehicle, I found pcmB fuse--20 amp. Two fuse legs goes to pcm, the other goes to load side of fuel pump relay. If I had to guess, I'd say the fuel pump has a problem. If the wiring before the fuel pump relay or the pcm was the problem, then the fuse would blow as soon as soon as you plug it in. The fuse circuit shows to be hot all the time. Just my opinion. There might be other issues, but, I can't track it from where I am.

Aug 06, 2017 | 2005 GMC Yukon XL

1 Answer

2003 trailblazer keeps blowing pcm fuse. wont start, key stuck in on position.


YOU HAVE MANY THINGS THAT CAN BLOW THE PCM FUSE.STARTER RELAY,ALTERNATOR, PARK NEUTRAL SAFETY SWITCH, FUEL PUMP, AND THE PCM CAN BE SHORTING OUT.

May 01, 2011 | 2004 Chevrolet TrailBlazer

3 Answers

I have a 02 grand caravan, there is fuse call asd that keeps on blowing.


Well in a short term, you have a short circuit somewhere. Here is a detailed toturial for you. Please rate this post, thank you.

Automatic Shutdown (ASD) sense - PCM Input

The ASD sense circuit informs the PCM when the ASD relay energizes. A 12 volt signal at this input indicated to the PCM that the ASD has been activated. This input is used only to sense that the ASD relay is energized.
When energized, the ASD relay supplies battery voltage to the fuel injectors, ignition coils, and the heating element in each oxygen sensor. If the PCM does not receive 12 volts from this input after grounding the ASD reley, it sets a Diagnostic Trouble Code (DTC).

Automatic Shutdown Relay - PCM Output

The PCM operates the Automatic Shutdown (ASD) relay and fuel pump relay through one ground path. The PCM operates them by switching the ground path for the solenoid side of the realys on and off. Both realys turn on and off at the same time.
The ASD relay connects battery voltage to the fuel injectors and ignition coil. The fuel pump relay connects battery voltage to the fuel pump.
A buss bar in the power distribution center (PDC) supplies voltage to the solenoid side and contact side of the relay. The ASD relay power circuit contains a 20 amp fuse between the buss bar in the PDC and teh relay. The fuse also protects the power circuit for the fuel pump relay and pump. The fuse is located in teh PDC.
The PCM controls the relay by switching the ground path for the solenoid side of the relay on and off. The PCM turns the ground path off when the ignition switch is in the Off position. When the ignition switch is in the On or Crank position, the PCM monitors the crankshaft position sensor and the camshaft position sensor signals to determine engine speed and ignition timing (coil dwell). If the PCM does not receive the crankshaft position sensor and camshaft position when the ignition switch is in teh Run position, it will de-energize teh ASD relay.
The ASD relay and fuel pump relay are located in the PDC near the battery. The inside top of the PCD cover has a label showing relay and fuse location.

ASD and Fuel Pump Relays

The following description of operation and tests apply only to the Automatic Shutdown (ASD) and fuel pump relays. The terminals on the bottom of each relay are numbered.

'------------------'
' __85 ___________'
' __87A '87 '30 ___' Sorry for the crudeness of this. This is supposed to
' __86 ___________' be the relay terminals!
'------------------'

OPERATION
- Terminal number 30 is connected to battery voltage. For both the ASD and fuel pump relays, terminal 30 is connected to battery voltage at all times.
- The PCM grounds the coil side of the relay through terminal number 85.
- Terminal number 86 supplies voltage to the coil side of the relay.
- When the PCM de-energizes the ASD and fuel pump relays, terminal number 87A connects to terminal 30. This is the Off position. In the off position, voltage is not supplied to the rest of the circuit. Terminal 87A is the center terminal on the relay.
- When the PCM energizes the ASD and fuel pump relays, terminal 87 connects to terminal 30. This is the On position. Terminal 87 supplies voltage to the rest of the curcuit.

TESTING
The following procedure applies to the ASD and fuel pump relays.
(1) Remove relay from connector before testing.
(2) With the relay removed from the vehicle, use an ohmmeter to check the resistance between terminals 85 and 86. The resistance shoud be 75±5 ohms.
(3) Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity between terminals 30 and 87A.
(4) Connect the ohmmeter between between terminals 87 and 30. The ohmmeter should not show continuity at this time.
(5) Connect one end of a jumper wire (16 guage or smaller) to relay terminal 85. Connect the other end of the jumper wire to the ground side of a 12 volt power source.
(6) Connect on end of another jumper wire (16 guage or smaller) to the power side of the 12 volt power source. Do not attach the other end of the jumper wire to the relay at this time.

WARNING: DO NOT ALLOW OHMMETER TO CONTACT TERMINALS 85 OR 86 DURING THIS TEST.

(7) Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohmmeter should now show continuity between relay terminals 87 and 30. The ohmmeter should not show continuity between relay terminals 87A and 30.
(8) Disconnect jumper wires.
(9) Replace the relay if it did not pass the continuity and resistance tests. If the relay passed the tests, is operates properly. Check the remainder of the ASD and fuel pump curcuits.

__________________________________________________ _______________

I know you said you replaced the relay, and this is a test procedure for the relay, but I have bought bad parts in the past. The description before the test procedure at least gives you an idea of what components are wired through and controlled by the relay. One of those may be faulty. Email me if you want or need wiring diagrams and I should be able to scan them and email them to you.

I hope this helps.

Please rate this post, thank you

Apr 07, 2011 | Dodge Grand Caravan Cars & Trucks

1 Answer

Mycar wont start ichanged the fuelpump fuse and it keeps blowing its a 2003 pontiac grandam it turns over just wont start


REMOVE FUEL PUMP RELAY.REPLACE FUSE IF STILL BLOWS SHORT IN PCM TO IGNITION CIRCUIT.IF FUSE DONT BLOW I AM LOOKING AT A BAD FUEL PUMP RELAY OR FAULTY FUEL PUMP.

Jul 10, 2010 | 2003 Pontiac Grand Am

1 Answer

Will not start and checked fuel pump no power to fuel pump i also have blown fuse for ecmb that blows as soon as i replace it


ECM B fuse supplies a constant 12v hot at all times to the VCM/PCM and to the fuel pump relay. The fuse is blowing telling you that there is a short to ground somewhere. Try this, take the fuel pump relay out and put a new fuse in. If it doesn't blow put the relay back in and if it blows then try a new relay. The relay may be shorted to ground internaly. Other wise you'll have to trace the wires to the VCM and the pump relay to look for a chafed wire that's contacting metal. The wire coming from the ECM B fuse is orange and has a splice in it going to the pump relay and the VCM/PCM.
Hope this helps.....Andrew

Mar 28, 2010 | 1999 Chevrolet S-10 Pickup

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