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"