Go Back   Club Lexus Forums > Lexus Model Forums > SC Models > SC 400/300 > Performance & Maintenance
Sign in using an external account
Register Forgot Password?

cranks, no start, code 12, rpm signal, .....????

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 01-06-07, 11:43 AM   #1
ki_soarer
Lexus Champion
Trader Score: (0)
 
Join Date: Aug 2003
Location: Orlando, Florida
Posts: 3,254
Send a message via AIM to ki_soarer Send a message via Yahoo to ki_soarer
Default cranks, no start, code 12, rpm signal, .....????

my car died while driving on monday. it sputtered like i ran out of fuel. i had been on the same tank for only 2 days, and have over half a tank left. i had it towed back to work to take a look.

my first thought was the fuel pump. i got it on a lift and checked pressure. ive got 45psi. i checked the injectors, and they are all pulsing fine. so, in theory i have fuel... i also changed the filter to be safe.

i changed the plugs and wires. the cap and rotor are only a year and a half old, but i checked it anyways, and its all good. i have plenty of spark.

checked compression... after trying to start so many times, i washed the rings, so compression was only 80psi at best. i put some oil down the plug hole to get the rings back up. rechecked compression and im now at about 150-160 across the board.

still wont start!

rechecked the CEL codes, as last time, there were none. now i have code 12 for the RPM signal.

im thinking the crank sensor took a crap. any ideas?

does anyone know where the hell the crank sensor is? i called the lexus dealer, but they said their too busy.

its a shame all of us BMW tachs are so spoiled with the bimmers... it makes it hard to diagnoss the SC in a timely manner.

thanks for the help.
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
__________________
http://www.clublexus.com/gallery/data/500/sig_11.jpg
93 SC300 5-speed with full 97 refreshSOLD

-'05 GSX-R 750; my beater

-04 BMW M3- SOLD
ki_soarer is offline   Reply With Quote
Old 01-06-07, 12:13 PM   #2
ki_soarer
Lexus Champion
Trader Score: (0)
 
Join Date: Aug 2003
Location: Orlando, Florida
Posts: 3,254
Send a message via AIM to ki_soarer Send a message via Yahoo to ki_soarer
Default

ok, the dealer called back and said there is no crank sensor on the car.

the tech over there said the distributor is where the computer gets its RPM signal.

i have a hard time beliving thats the only place seince there are two codes for RPM signal... 12 and 13. i have code 12.

he said he would call back when he finds out where to look for code 12. damn this waiting game... but im not going to spend $125 just for them to look at it and recheck everything ive already checked.

does anyone know which wire from the 4 on the connector for the distributor is the one for RPM signal? i dont have access to any manuals or pin locations.

thanks.
__________________
http://www.clublexus.com/gallery/data/500/sig_11.jpg
93 SC300 5-speed with full 97 refreshSOLD

-'05 GSX-R 750; my beater

-04 BMW M3- SOLD
ki_soarer is offline   Reply With Quote
Old 01-06-07, 04:22 PM   #3
got_trd
Lexus Champion
Trader Score: (0)
 
got_trd's Avatar
 
Join Date: Feb 2004
Location: Tampa, FL
Posts: 3,073
Default

its probably the wire your alarm is spliced into... check the connection of that. told ya that alarm was f'in up your car...
__________________
-ChiNo-
'93 Lexus SC300- *Orlando's first 1jz-gte SC300* sold
'07 BMW 335i Sedan- sold
'09 BMW 335i M-sport/ZMP sedan- daily driver
http://www.clublexus.com/forums/image.php?type=sigpic&userid=23393&dateline=1220801083
http://www.fquick.com/1clean335i
Quote:
Originally Posted by iSuxeL View Post
I knew I was gonna get my butt handed to me!

Last edited by got_trd; 01-06-07 at 04:28 PM..
got_trd is offline   Reply With Quote
Old 01-06-07, 05:46 PM   #4
ki_soarer
Lexus Champion
Trader Score: (0)
 
Join Date: Aug 2003
Location: Orlando, Florida
Posts: 3,254
Send a message via AIM to ki_soarer Send a message via Yahoo to ki_soarer
Default

nope, thats been dissconnected. im thinking the code was actually from spinning the motor over with all the plugs and wires removed and the distributor connector off while i was checking the compression.

honetsly, the only thing left that still makes sence is bad gas... ill have to get a sample on monday.

p.s.- im taking your car to josh's party
__________________
http://www.clublexus.com/gallery/data/500/sig_11.jpg
93 SC300 5-speed with full 97 refreshSOLD

-'05 GSX-R 750; my beater

-04 BMW M3- SOLD
ki_soarer is offline   Reply With Quote
Old 01-11-07, 03:47 PM   #5
ki_soarer
Lexus Champion
Trader Score: (0)
 
Join Date: Aug 2003
Location: Orlando, Florida
Posts: 3,254
Send a message via AIM to ki_soarer Send a message via Yahoo to ki_soarer
Default

for the record, a new distributor fixed it.

SHE'S BACK!!!!!!!!!!!!!!

anytime you see code 12 on a pre 96 SC300, it has to be the distributor... there is no crank or cam sensor.
__________________
http://www.clublexus.com/gallery/data/500/sig_11.jpg
93 SC300 5-speed with full 97 refreshSOLD

-'05 GSX-R 750; my beater

-04 BMW M3- SOLD
ki_soarer is offline   Reply With Quote
Old 01-11-07, 04:18 PM   #6
MDeezy
Rookie
Trader Score: (0)
 
MDeezy's Avatar
 
Join Date: Oct 2006
Location: GA
Posts: 92
Send a message via AIM to MDeezy
Default

good to hear you got it fixed. nothing more troubling than a problem that is hard to diagnose.
MDeezy is offline   Reply With Quote
Old 01-14-07, 03:18 PM   #7
philauldridge
Driver
Trader Score: (0)
 
Join Date: Jun 2001
Location: Texas
Posts: 187
Default RPM signal

You guessed right! There are three separate pickup coils in the distributor which measure RPM and crankshaft angle. if any one of these sensors malfunctions, or a shorted wire between there and the ECU, you'll get the code 12. Most likely you could have just isolated the particular sensor, but a whole new distributor would surely do the trick! Good call
__________________
ULTIMATE LEXUS SC300 5-speed
Supra Twin Turbo Engine 450 HP..
www.UltimateLexusTT.com
BLOG: http://blog.auldridge.org/2010/03/21...f-flying-lexi/
Austin Texas
philauldridge is offline   Reply With Quote
Old 01-14-07, 03:24 PM   #8
ki_soarer
Lexus Champion
Trader Score: (0)
 
Join Date: Aug 2003
Location: Orlando, Florida
Posts: 3,254
Send a message via AIM to ki_soarer Send a message via Yahoo to ki_soarer
Default

i wasnt happy about spending $230 at lexus for a new one... (at my cost), but i had a friend with a used one for $20, so that made it easy.

p.s. phil, did you come back to CL just to help me out? where he hell have you been hiding? hows the SC?
__________________
http://www.clublexus.com/gallery/data/500/sig_11.jpg
93 SC300 5-speed with full 97 refreshSOLD

-'05 GSX-R 750; my beater

-04 BMW M3- SOLD
ki_soarer is offline   Reply With Quote
Old 01-16-07, 12:21 PM   #9
LyFeWoRx
Pole Position
Trader Score: (0)
 
Join Date: Jul 2006
Location: WA
Posts: 217
Default

I'm having this exact problem on my SC400. Is there anyway to test the dist?
__________________
1995 Pearl White SC300 5 Speed. (Sold)
1992 Pearl White SC300 Auto (NA-T Project)
LyFeWoRx is offline   Reply With Quote
Old 04-16-11, 03:55 PM   #10
BobbyB
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2004
Posts: 39
Default what ever was the problem

did you every find out what the problem was...I'm having the same issue with my sc300.>>>. Let me know if you can help..
BobbyB is offline   Reply With Quote
Old 04-16-11, 04:11 PM   #11
sc4doubleO
Driver
Trader Score: (0)
 
sc4doubleO's Avatar
 
Join Date: May 2010
Location: fl
Posts: 158
Default

Quote:
Originally Posted by BobbyB View Post
did you every find out what the problem was...I'm having the same issue with my sc300.>>>. Let me know if you can help..
Check post #5 he said a new distributor fixed it.
sc4doubleO is offline   Reply With Quote
Old 04-16-11, 04:51 PM   #12
1WILLY1
Lexus Champion
Trader Score: (7)
 
1WILLY1's Avatar
 
Join Date: Jul 2010
Location: toronto
Posts: 3,828
Default

Quote:
Originally Posted by LyFeWoRx View Post
I'm having this exact problem on my SC400. Is there anyway to test the dist?
are you throwing codes?

i had the same problem with mine only difference was i was throwing a code 13 rpm signal instead of a 12.

Turned out to be a loose plug on my cam sensor.

Check your cam and crank sensors on the 400 as they do have both cam and crank sensor.
1WILLY1 is offline   Reply With Quote
Old 04-16-11, 05:37 PM   #13
BobbyB
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2004
Posts: 39
Default stalling out

I'm throwing a code 12 on a 95 300. I read here that pre 96's don't have cam and crank sensors. I was wondering if anyone found out what sensor in the distributor was bad, rather than replace the distributor itself. I did see where the clip on the coil wire where it connects to the distributor was broken and the plug was loose. The coil plug looked a little rusty, so I ordered
a new one. But the clip and the wire will not be here for a week. Was just wondering if anyone had more specific info...thanks.
BobbyB is offline   Reply With Quote
Old 04-19-11, 12:09 PM   #14
BobbyB
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2004
Posts: 39
Default code 12

Can anyone provide more info on which senor in the distributor is the problem when the engine cuts out after starting and throws a code 12....?
It would be much appreciated..thanks.
BobbyB is offline   Reply With Quote
Old 04-19-11, 12:16 PM   #15
99SC42
gte & na-t
Trader Score: (44)
 
99SC42's Avatar
 
Join Date: Jan 2007
Location: In front of you
Posts: 4,957
Default

92-97 SC300 gets the crank and cam signal from the distributor so i would replace the distributor and go from there.
99SC42 is offline   Reply With Quote
Old 04-19-11, 12:16 PM
 
 
 
 
Reply

Tags
12, 1jz, 92, 93, code, crank, cranks, is300, lexus, no, rpm, sc300, sc400, signal, start

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 01:57 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info