Hi everyone. I’m new to the forums so if this is in the wrong place please let me know. Anyway, I have a 05 g35 Coupé it is a automatic sadly.

It cranks all day but doesn’t start I bought this car from a guy who had to get rid of it because he was moving to Cali. I bought it not running which at this moment now was a big mistake. I know it isn’t getting any spark. The crank and cam shaft sensors are fine and I put new spark plugs and a new battery in. I haven’t even checked the timing yet which I will this weekend but shouldn’t I get a spark even if the timing is off and get some sort of back fire?

It’s getting fuel as well I hear the pump kick in and I do have good fuel pressure. I took it to a shop Via Uhaul trailer(bad idea btw. lowered cars and those uhaul transport trailers don’t mix well lol.) I got it to the shop and they did a electrical diagnostic and said it was a BCM problem.(I had another post on a different account but lost the password to it).

I had replaced the BCM and got the key programmed. When I took it to the Infiniti dealer they said the BCM Being bad wouldn’t make the car not start. The car doesn’t pull up a single code on the ECM. And I have no idea what it is. Also, a fuse blew it I don’t recall the name but I know it delt with the Ignition system it is located above the windshield wiper fuse. I replaced it and it hasn’t blown since. The infinity tech said, ‘When the car cranks it is a strong crank” they wanted to charge me 175$ a hour to even diagnose it.

Which in all reality I don’t make enough money to cover that. I’m really at a loss here and I don’t know what it could be that’s why I try to come to the forums for help.

If you have read this thank you for your time and if you guys have any idea what it could be please let me know.

 

Not sure if the factory alarm disables the ignition, starter or both but it seems possible the alarm could be killing the run circuit. I've not had a problem with the g but had a vehicle in the past that if the alarm activated it would turn over but would not start.

 

I think the stock security system stops you from physically turning the ignition switch if there is no key or no chip present. So if it's cranking that's probably not it.

Your Factory Service Manuals are here, thanks to the NICO club:
https://www.nicoclub.com/FSM/G35/Coupe/2005/

ec.pdf is Engine Control and pg.pdf is Power and Ground. Not easy reading but if you're patient you can trace things and hopefully figure out what's wrong. Look carefully for the many fuses involved which are in different locations around the car (+ battery post, IPDM, fuse box near driver's left leg...)

 

The only other thing that comes to mind is if has had an a/m alarm installed in it, a stereo upgrade, or some type remote start add-on. Something where the previous owner had been fooling with the factory wiring. For that matter it could be as simple as a bad ignition switch. Thinking out loud I guess.

 

Factory security system still pets the engine crank but it won't fire the coil packs or open the injectors.

Is the little RED LIGHT on the side of the dash solid red when you are cranking the engine? If yes then the security system NATS/IVIS is preventing spark/fuel.

When you replaced the BCM you had Nissan/Infiniti program it yes?

 

I forgot to mention this but, I took it to the dealer and they said that the BCM would not keep the car from starting so that part isn’t the issue at least that’s what they claimed. But I appreciate the response

 

Did you follow the starting sequence in the FSM?

http://www.nicoclub.com/FSM/G35/Coupe/2005/sc.pdf

See page SC- 11

A/T MODELPower is supplied at all times
through 40A fusible link (letter M, located in the fuse and fusible link block)
to ignition switch terminal 1,
through 10A fuse (No. 71, located in the IPDM E/R)
to CPU of IPDM E/R,
through 15A fuse (No. 78, located in the IPDM E/R)
to CPU of IPDM E/R.With the ignition switch in the ON or START position, power is supplied
from ignition relay (located in the IPDM E/R)
to CPU of IPDM E/R.When the selector lever in the P or N position, power is supplied
from A/T assembly terminal 9
to IPDM E/R terminal 53.Ground is supplied
to IPDM E/R terminals 38, 50 and 60
from grounds E17 and E43.Then starter relay is turn ON.With the ignition switch in the START position, IPDM E/R is energized and power is supplied
from ignition switch terminal 5
to IPDM E/R terminal 4 and
through IPDM E/R terminal 3
to starter motor terminal 1.The starter motor plunger closes and provides a closed circuit between the battery and starter motor. The starter motor is grounded to the engine block. With power and ground supplied, cranking occurs and the engine starts.

See page SC-14 and use your multimeter to test all fuses and the IPDM

Also see section EC

 

Yes I did and no it isn’t solid red

 

Thank you! Ill look into that.

 

I'd pull out and test Every. Single. Fuse. in the entire car. If you don't have spark/fuel then something is preventing the ECM from opening them, might as well check everything.

Did you use Genuine Nissan or Hitachi brand sensors when you replaced the cam and crank sensors?