Fuses are current overload protection devices, specifically engineered to act as the weak link in an electrical circuit. A fuse keeps a circuit from passing excess current and destroying whatever's attached to it or melting the wires and starting a fire.How to Diagnose and Find a Short Circuit or Wire in Your Car
Automotive ignition fuse malfunctions pose a few unique problems, primarily since they're usually not the only thing on that circuit. Fuses come in all types and varieties, but they all work in a similar fashion.
Current passes through the fuse via a small metal strip or a spring; that small metal strip creates a sort of bottleneck in the system, a point of high impedance where electricity will slow down and turn into heat. Once that strip gets hot enough, it melts, snaps and breaks the circuit connection. So, to find the source of your problem, you'll need to look for an electrical short circuit that pulls more energy through the system than it was designed to handle.
The problem with automotive electrical troubleshooting is that multiple systems often run through the same circuit or fuse. For instance, your ignition system might share its power source with the starter, fuel pump, fuel injectors, ignition control computer or that flashing skull shifter knob you bought from Pep Boys. So, the malfunction might not even be in your ignition system; it could be a malfunction or short circuit in any of the connected systems.
The good news is that there aren't too many things in the ignition system itself that can blow your fuse, particularly if the the ignition coil draws its current directly from the battery or alternator via a relay. If that's the case, then your fault is almost certainly in the ignition switch itself or the wires going to it.
Within the distributor itself, a bad or bypassed ballast resistor can repeatedly blow fuses, but that's unlikely unless some hack mechanic did a bad wiring job on it.
A bad coil might blow fuses, but it'll more than likely kill the engine before that happens. If your ignition system shares a common circuit with something motorized -- a fuel pump, cooling fans, power window motor, starter, etc. Electric motors always draw a certain amount of wattage, or amperage multiplied by voltage. Higher voltage makes the motor spin faster, more amperage causes it to produce more torque. If the motor seizes up or something forces it to slow down, voltage draw will drop and amperage draw will increase to maintain the same wattage.
This can easily blow a fuse, particularly if it's already heavily loaded by something as power-hungry as the ignition system. Inspect your wires carefully; hot parts on the engine can easily burn through the wiring's insulation and short the wires, and metal edges will cut through the wires and short them out.
If you've got fuel injection, then you might be experiencing an internal short in the computer itself. In that case, you're out of luck; it's off to the parts store or junkyard for a new computer. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.
To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Ignition System Faults The good news is that there aren't too many things in the ignition system itself that can blow your fuse, particularly if the the ignition coil draws its current directly from the battery or alternator via a relay.
Ancilliary Faults If your ignition system shares a common circuit with something motorized -- a fuel pump, cooling fans, power window motor, starter, etc. Wiring and Computer Faults Inspect your wires carefully; hot parts on the engine can easily burn through the wiring's insulation and short the wires, and metal edges will cut through the wires and short them out.
About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Forums New posts Search forums. What's new New posts New profile posts Latest activity. Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in.
It was really weak, so I bought a new one. Well, it turns over good but it's blowing fuses. I don't know what the hell is going on. I checked the wires running to the ecu and they all seem good.
Could my ecu be faulty?
Why Does My ECM-I Fuse Keep Blowing?
Btw, I searched and couldn't find anything. I pushed out the car uninstall ed the radio and taped all the wires separate and replaced the fused and it started and the fuse did not blow, and also i got the radio for free, but it the wires in the radio din.
EF Honda EF said:. I'm not sure what's going on. We had the alternator tested and it was good. Think it could be the distributor? That wouldn't cause it to blow the ecu fuse though, would it? You must log in or register to reply here.View Full Version : Civic alternator sp sensor fuse blowing.
Civic 1. If I drive it I get no speedo, then if I stop it, I need to replace the fuse before it will start again. Anybody seen this before? Or know how to change this sensor? Any help would be really appreciated.Electrodessication pen
I just recently started having the same problem with my 97 Civic DX. This morning the engine light came on again, the speedometer is dead, and the 15 fuse is blown again. And every time I insert a new fuse and try to start the car the fuse blows again. I have been searching thru the manuals but I cant find any reference to what the 15 fuse goes to - does anybody have any ideas? The alternator speed sensor fuse seems to be part of the charging system circuit as well as the vss vehicle speed sensor.
My fuse 15 is blowing too. I have a rebuilt alternator and voltage regulator, I have a new VSS installed, the only other problem I can think of is a short in the circuit. A short in the circuit means there is an unintentional conduction of electricity resulting in high amps when the volts travel to ground. I think. I have to check my wires and connections along the circuit for any exposed wire. Sounds fun eh? The VSS is located on the transaxle. It sticks out of the transaxle about an inch and a half with a grey connector to it carrying 3 wires.
One 10mm bolt holds it down.The electronic control module ECM -- also called the powertrain control module PCM or electronic control unit ECU -- is a computer which controls the electronics in an automobile. The ECM 1 is one such computer; it has a fuse is installed to protect the computer from sudden power surges or other component damage -- the fuse will blow before any damage can reach the ECM.
Many component defects can cause your ECM 1 fuse to blow. Although complaints have been reported about the O2 sensor causing the ECM 1 fuse to blow, in reality it is not the O2 sensor causing the problem -- it is the placement of the O2 sensor. If the wires leading to the O2 sensor rub against the exhaust, it creates a ground; once the O2 sensor is grounded, the fuse to the ECM 1 blows.
The O2 sensor must be installed in a different place to ensure the wires do not short-circuit. Another cause of an ECM 1 fuse consistently blowing is a fuel pump problem.
When the fuel pump begins to fail it overheats, causing it to drain more amperage amp ; if the amps exceed the amount of amps the ECM 1 fuse allows, the fuse will blow. Replacing the fuel pump should correct this problem.
The ECM 1 operates via voltage sent from the battery. Anytime an electrical wire becomes frayed, burnt or damaged, the wiring leading to the ECM 1 will short-circuit; once a wire short-circuits, a power surge can occur; if the power surge exceeds the ECM 1 fuse's limitations it will blow the fuse. It is hard to track down a short circuit, but you will have to look at every wire leading to the ECM. It is best to have a qualified technician -- with the tools and devices to narrow down the specific wire causing the short -- work on such fuse problems.
The starter is the component that engages the engine when the ignition system is turned on. Voltage from the battery is sent to the starter, which then engages and starts the engine. If the starter is failing or has failed, voltage can get redirected to the ECM. The voltage or amps surge, causing the ECM 1's fuse to blow.
When the starter fails you will hear a clicking noise or the engine will be hard to start. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Calculus in animation
To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Wiring The ECM 1 operates via voltage sent from the battery. Starter The starter is the component that engages the engine when the ignition system is turned on. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.My car will not start and it keeps blowing 10 amp ECU fuses.
I think it might be a burnt wire because I know my ECU is fine. Do you. You have a short circuit in the ECU wiring or the components it powers-time to trace the circuit. Was this answer. I am having to replace up to 5 times per journey as when the car is slowing to a standstill or is at standstill or just set off from lights, junction, roundabout, parking space etc it just blows the fuse and the car stalls.
Once fuse replaced it starts and sets off OK for a while! Is this a common fault with the Rio? What is the problem and is it expensive to fix? TIA Was this answer. I would start by inspecting the wiring that goes to the ECU. If you replace it I would recommend buying a used one as you can get them much cheaper.
What causes 10 amp ECU fuse to blow Was this answer. Most of the time when you have a ECU fuse blowing is because one the oxygen heaters has shorted to ground. Start by unplugging the sensors and then replace the sensor when the fuse doesnt not pop anymore. Here is a guide to help you get the job done. Cheers Was this answer.
Wow so good!
FI ECU fuse blew
You hit it on the money I found the sensor behind the cat that was causing the problem and the car runs great.
I love this site. Thanks for using 2 car pros come back any time Was this answer. Please login or register to post a reply.
Related Engine Computer Fuse Content. Sponsored links. Ask a Car Question. It's Free!The car sat for about 2 or 3 years then I gave it a tune-up changed all fluids put new gas in it. It started right up, I let run for about 30 mins.
I tried to start it again the next day it would not start.
Here is a list of things i have change on it fuel pump, main relay, ignition switch. When I try to start it, the ecu fuse blows immediately then the engine just rotates but no start. JP answered 5 years ago. You have a dead short either in the ecu or in some of the wires going to or from it more than likely. It is also most likely from rodent damage to the wires from sitting for so long.
I tried to start it again the ne My 91 Accord's harmonic balancer came loose and I replaced it but after I did so my battery main fuse keeps blowing any answers will help.
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