cranks, no start, code 12, rpm signal, .....???? - Club Lexus Forums

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

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Old 01-06-07, 11:43 AM   #1
ki_soarer
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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.
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Old 01-06-07, 12:13 PM   #2
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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.
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Old 01-06-07, 04:22 PM   #3
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its probably the wire your alarm is spliced into... check the connection of that. told ya that alarm was f'in up your car...

Last edited by got_trd; 01-06-07 at 04:28 PM.
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Old 01-06-07, 05:46 PM   #4
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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
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Old 01-11-07, 03:47 PM   #5
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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.
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Old 01-11-07, 04:18 PM   #6
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good to hear you got it fixed. nothing more troubling than a problem that is hard to diagnose.
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Old 01-14-07, 03:18 PM   #7
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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
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Old 01-14-07, 03:24 PM   #8
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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?
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Old 01-16-07, 12:21 PM   #9
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I'm having this exact problem on my SC400. Is there anyway to test the dist?
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Old 04-16-11, 03:55 PM   #10
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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..
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Old 04-16-11, 04:11 PM   #11
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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.
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Old 04-16-11, 04:51 PM   #12
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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.
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Old 04-16-11, 05:37 PM   #13
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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.
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Old 04-19-11, 12:09 PM   #14
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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.
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Old 04-19-11, 12:16 PM   #15
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92-97 SC300 gets the crank and cam signal from the distributor so i would replace the distributor and go from there.
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