hey guys my wifes 2002 V35 CVT-8 sedan has been doing this problem since the day i bought it for over a year now.
it only goes into limp mode BEFORE you start the car. Then the car doesn't go over 2000 - 2500 revs but reaches any speed you want (slowly) and VDC, SLIP etc. lights are on.
If you switch the car off and on sometimes it goes back to normal but its just pot-luck. Sometimes, switching off the car, banging the steering wheel (and avoiding triggering the airbag ) and banging the dash around the aircon cluster then trying to start it seems to work but i reckon its all luck.
When it does go into limp mode it does it while you turn the key to accessories so all the lights come on but not start the car. If it enters this mode before you start it then it will stay in it when you continue turning the key to start and stay like that unless you turn the key off and on again in the hope that it dissapears.
Also a point i have to make is that when it does go into limp mode, there is a buzzing noise from the engine bay much like a relay struggling to open or close. If it does not do this noise before you start the car (while the key is on accessories) then the car will not go into limp mode.
OK, so here are error codes from Nissan:
9 CODES WERE RETRIEVED FROM ECU.
-BRAKE LAMP - LOW VOLTAGE
-BATTERY LOW VOLTAGE
-ECT THROTTLE MOTOR
-TRANSMISSION VOLTAGE X 3 FAULTS
-START VOLTAGE LOW
ALL CODES ARE DIRECTLY LINKED TO BATTER FAULT, POWER FAULT.
SOME CODES FOUND COULD HAVE BEEN EARLY CODES NOT CLEARED.
ok that was word-for-word from Nissan (but the bastards wouldn't give me the numbers of the codes)
as can be see, they are mostly "low voltage" errors so I did the first thing and that was to change to a new batter to make sure the old one wasn't causing the problem (you never know).
It still does it and its stumped me because its not like any other cars that i've read about online that go into limp mode while driving...it does it sometimes BEFORE you even start the car and also when it does do it theres a buzzing noise from the engine like i mentioned above which leads me to think that because of this "low-voltage" problem, there is a relay that is getting stuck and causing this car to go into limp mode.
any ideas?
Also apparantly theres a guy here in melbourne called Nuwan (excuse spelling) that knows these cars real well... anyone have his details?
thanks in advance, any info would be great so i can resolve this issue coz my wife driving around like that with no power can be dangerous in the event she needs to "step-on-it"
cheers,
Nas