I've A 92 ls 400 with 217K and I'm getting a engine code 12 - RPM SIGNAL. Can someone interpret this please ? What does it mean and how can i fix it because this is causing vehicle to stall everynow and then and some times it wont start at all.

 

woohoo another rpm signal DTC code....i just made a thread that had a picture of what to do....search for threads made under my name.

 

i had that problem too it sucked. i think i saw Licelsior's thread. its pretty recent

 

licelsior...what did u find out was the problem on ur car?

 

no i havent. i have been caught up with school work so no major work has been done to the car yet.

 

I replaced my timing belt after cotemplating for the past year. A couple of people say it may have been a took off triggering the code 12. I also replaced the pulley bearings and tensioner ($400 all together in parts). This hasnt solved my code 12 - car still cuts off. Im frustrated

 

timing belt could be a tooth off, or the camshaft ps's could be bad.

 

thats what they said the first time i replaced the belt in 06. this was actually a re-work i did yesterday with a new belt and to be honest the belt i put in 06 was lined up perfect. the bearings were shot though. so i dont think its off a tooth and i dont think its the cam sensor coz i replaced both a year ago. however, i replaced the sensors with used ones i got off an engine i have for parts.

 

depending on price i'll buy new cam sensors coz ive tried everything i even did the timing belt over and that wasnt it

 

u have to replace the sensor connectors also

 

This sounds like a similar problem I had with my 2000 MBZ C280. It started with a random no start and after letting the car sit for an arbitrary amount of time, it would start and run absolutely normally until the next random no start. This progressed to a random stall where you would be driving down the road and the car would suddenly shut down. If you sat for awhile, the car would start and then run normally until the next stall. Turned out to be the crankshaft position sensor (changed the camshaft position sensor also but this didn't fix it). Don't know if there is a similar part for our Lexus.

glenmore
1990 LS400
1991 300CE
2000 C280

 

AFTER PYTHONS COMMENT ABOUT CHANGING CONNECTORS TO THE CAM SENSORS TOO, I DECIDED TO CLEAN THE CONNECTORS WITH AN ELECTRONIC CONTACT CLEANER. WELL SO FAR THE CAR'S BEEN FINE. WOULDN'T THAT BE SOMETHING IF IT WAS JUST A CONNECTOR. IT HAS BEEN AN EXPERIENCE AND FROM IT I'VE LEARNED THAT A TOOTH OFF ON THE TIMING WOULD TRIGGER THE CRANK SENSOR. I PAID $600 FOR THE TIMING BELT, WATER PUMP, THE TWO BEARING PULLEYS AND THE TENSIONER. THERE'S A WEB SITE: http://www.shopping.com/xDN-automoti...cessories~PG-8
WHERE ALL THIS INCLUDING THE CAM O RINGS- $259 (FREE SHIPPING) OUCH!!!!
THE CAR WOULD HAVE NEVER RAN THAT SMOOTH BEING ONE TOOTH OFF. ALL OF YOU HAVE BEEN A BIG HELP AND I HOPE THIS IS IT BUT YET TO SEE WILL KEEP POSTED .THANKS!!

 

so u cleaned the connector and it was good? can u post a pic of the location of the cam sensor?

 

nice....they are located by the distributors i believe, you need to take that plastic crap off to get to them

 

the cam sensors are right in the distributor housing the connectors for the left, under the top radiator hose and is attached to the coolant by pass line, for the right connector it is right underneath the coil pack thats next to the thermostat housing. will try to post pic but i'm not computer savy