Joined: Jan 2006
Location: Chattanooga, TN
I asumed that cause 55 is the only 5 flash code. A trouble tree is what you can use to test individual areas to find the cause. You might chech the resistance on one componante and voltage drop of another. OSM is Online Service Manual you can download it from most sites for free. I can't remember if this site has it up but you can get it for sure from 300zxclub.com.
Nissan Master Tech, Mtn View Nissan Chattanooga, TN