85 fairlady power to coil but no spark

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thomas620
Posts: 2
Joined: Mon Mar 17, 2014 9:39 pm
Car: 85 300zx 2+0 name 5 speed

85 fairlady power to coil but no spark

Postby thomas620 » Mon Mar 17, 2014 10:14 pm

Hi, everyone
I'm new to the Nissan world and I'm having trouble with my first fairlady 2+0 na I can't seam to get spark from the coil to the plugs but I have power to the coil I've checked the ecu and replaced the dizzy with a new one as well as the coil itself any help at all would be great than in advance


edgewise
Posts: 9
Joined: Mon Aug 11, 2008 10:27 am

Re: 85 fairlady power to coil but no spark

Postby edgewise » Thu Mar 17, 2016 8:04 am

Have you checked for ECU codes? The ICM (igntion control module) can cause this problem and usually throws a code 21.This basically a power transistor that gets the signal from the ECU which controls and amplifies current to the primary side of the coil. It is usually located on the bottom of the coil mounting bracket. The ICM component test in my factory manual is wrong, but you can use a you use a basic power transistor test. I don't have this off hand, but if I come across it I will post back.

You can do a quick ICM test by unplugging the connector to the botton of the coil and connecting a 12v test light or a multimeter at the output connections to the coil and crank the engine. The test light should light and/or get about 12V. Make sure you pull fuel injector fuse to prevent fuel to the cylinder during cranking.


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