I am trying to diagnose a 2003 G35 for a friend. The forum has been helpful but I still cant figure it out.
Long story short, car wouldnt rev, searched and found some info here. Replaced both camshaft sensors and throttle body. Car will start and rev up once but a second later the VDC, Slip And ABS lights come on and then the engine wont rev over 1400 to 1500 RPM.
Have done all the throttle resets and ecu resets. The check engine light is not on and when I scan for codes is says none found.
Any suggestions would be greatly appreciated.

 

Check the maf plug and throttle body sensor

 

I messed with the plug on the maf, if I unplug it I get an instant check engine light but nothing changes.

Some more info, before the new throttle body I noticed there was no movement noise when I turned the key on/off. Now with the new throttle body I can hear the throttle plate moving when I turn the key off. I tried all the throttle resets multiple times.

 

was the throttle body brand new? or new/used? I had the exact same issue and it turned out to be a malfunctioning throttle body. HOWEVER my ecu threw a SES light for the TPS so it was an easy diag. But there are a lot of different situations that lead to the same VDC/ABS/SLIP lights coming on so its tricky to check out. There are quite a few threads on here relating to it. Maybe try combing through them again for some more leads. When you checked for fault codes did you check for pending codes also? sometimes there can be a recognized problem without the SES light being activated

 

Also, if you have to take it to the stealership to get diagnosed, dont go to infiniti. Take it to a Nissan dealership. cheaper labor for the exact same BS

 

OK so this morning I started the car and it revs freely??!! Not sure why. But cel is on and it shows two codes. P1225 CTP Learning and P0507 Idle air control system rpm higher than expected. I drove the car a mile down the road and the slip light came on and no throttle. Pissed with it for a minute (re-started it twice) and it brought me back ok. Going to let it idle for a while and try driving it again.

 

you got it, i had this issue before, it was the auto body sensors.