cranks, no start, code 12, rpm signal, .....????
#1
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
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.
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.
![Stick Out Tongue](https://www.clublexus.com/forums/images/smilies/tongue.gif)
thanks for the help.
![Thumb Up](https://www.clublexus.com/forums/images/smilies/thumbsup.gif)
#2
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
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.
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.
#3
Lexus Champion
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
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.
#4
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
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.![Sad](https://www.clublexus.com/forums/images/smilies/sad.gif)
p.s.- im taking your car to josh's party
honetsly, the only thing left that still makes sence is bad gas... ill have to get a sample on monday.
![Sad](https://www.clublexus.com/forums/images/smilies/sad.gif)
p.s.- im taking your car to josh's party
![Stick Out Tongue](https://www.clublexus.com/forums/images/smilies/tongue.gif)
#5
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
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.
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.
![Thumb Up](https://www.clublexus.com/forums/images/smilies/thumbsup.gif)
#7
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
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
Trending Topics
#8
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
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.![Stick Out Tongue](https://www.clublexus.com/forums/images/smilies/tongue.gif)
p.s. phil, did you come back to CL just to help me out? where he hell have you been hiding? hows the SC?
![Stick Out Tongue](https://www.clublexus.com/forums/images/smilies/tongue.gif)
p.s. phil, did you come back to CL just to help me out? where he hell have you been hiding? hows the SC?
#11
#13
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
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.
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.