2001 Nissan Almera 1.8 Automatic Fuse to Spark Plugs keeps Blowing

Nissan Almera Problem
The Problem
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Hayley
Fixes: 1
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Fuse to Spark Plugs keeps Blowing
Apr 7, 2020 (1 month ago)
I have a 2001 Nissan Almera 1.8 automatic and the fuse to the spark plugs keeps going on it. I change the fuse and away I go. It's been into the garage and they have changed the Spark Plugs, checked the wiring over that they can see, replaced the 4 Coils, cleaned up the Earth, replaced a few other things but it is still happening. The next step is to remove all the wiring and check it that way which is now getting very expensive and as the car isn't worth a lot these days its probably not worth it. I'm in catch twenty-two with it as I can't afford a new car and struggling to pay for repairs. Has anyone else encountered this problem, and if so how did you fix it.

Car details
Car: Nissan Almera
Variant: 1.8 Automatic
Model Year: 2001
Category: Electrics, ECU, Warnings & Lights

Recalls: Nissan Almera Recalls
More: Nissan Almera Problems
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Replies and solutions
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scrubincookers
Fixes: 39
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Apr 8, 2020 (1 month ago)
Have you tested the relay switches. Some last forever, some don"t. Also try another battery.
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Hayley
Fixes: 1
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Apr 9, 2020 (1 month ago)
Thank you for replying to my problem. I have just spoken with my garage and they have tested the battery which is good as it was only about a year old as changed last year. They have also tested the relay switches.
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whittingehame
Fixes: 12,347
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Apr 9, 2020 (1 month ago)
Replying to post by scrubincookers:
Have you tested the relay switches. Some last forever, some don"t. Also try another battery.
Would be interested in knowing what relay switches you are referring to and how the battery can cause the fuse to blow .
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whittingehame
Fixes: 12,347
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Apr 9, 2020 (1 month ago)
Are you saying you have a designated fuse for the spark plugs ? Never seen that before . What number of fuse is it that blows and what else does it cover .
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whittingehame
Fixes: 12,347
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Apr 9, 2020 (1 month ago)
" On this type of ignition system a capacitor is fitted between power supply to the ignition coils and ground wire.
Measure the resistance of the capacitor it should be above 1Mohm.
Check the continuity betwee capacitor's terminal 2 to ground.
Check the resistance when engine is hot this may be the reason fuse.
Because there is 4 individual coils on your car I suggest to do the following in order to find what is causing the fuse to blow.
Check short circuits to the live wire supplying power to the coils.
Check ECM relay under the bonnet, if it is internally short it will also cause the fuse to blow.
To be honest the only quick way to check the relay is to replace it with genuine nissan relay.
Do not try to fit non genuine relay.
There may be one or more coils becoming to draw more current once the engine has been running of time.
So as you can see there is 4 possible causes.
My advise is to start troubleshooting in this order :
1.Check in capacitor and continuity to ground.
2.Check coil power supply wire circuits.
3.Replace the relay with genuine nissan part.
4.Measure current drawn by each ignition coil with amp meter.
Do all the above just after the fuse has blown, you will have more chance to find the fault"
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