LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

LS400 Code 12 and wont crank

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Old 04-20-12, 09:53 AM
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JTAuto864
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Default LS400 Code 12 and wont crank

I have a 94LS400 and I need help with a problem I am having trying to crank my car. I am showing code 12 from my Scanner and this is the problem I am having.
I cannot crank up my car from the ignition. I have to open the starter relay and press down the relay and the car cranks fine, but I cannot start the car by just turning my key. When I turn my key the lights on th dash board show but there is no signal to my starter. I have already tried to change the starter relay, cam sensors on both sides, crank sensor, ignition switch, and also replaced the neutral switch. The old neutral switch was fried up. Does anyone know about this problem and does anyone know how I could fix this or give me some suggestions? I would greatly appreciate it. Thank you for reading.
Old 04-20-12, 01:19 PM
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cndnate
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Originally Posted by JTAuto864
I have a 94LS400 and I need help with a problem I am having trying to crank my car. I am showing code 12 from my Scanner and this is the problem I am having.
I cannot crank up my car from the ignition. I have to open the starter relay and press down the relay and the car cranks fine, but I cannot start the car by just turning my key. When I turn my key the lights on th dash board show but there is no signal to my starter. I have already tried to change the starter relay, cam sensors on both sides, crank sensor, ignition switch, and also replaced the neutral switch. The old neutral switch was fried up. Does anyone know about this problem and does anyone know how I could fix this or give me some suggestions? I would greatly appreciate it. Thank you for reading.
What about by passing the ignition switch permanently and going with a push button and a toggle (arm) switch
Old 04-20-12, 02:14 PM
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dengman
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does the engine turn over? do you have fuel? do you have spark?
Old 04-20-12, 04:45 PM
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LiCelsior
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check your distrib caps to see that its not flipped, and check your timing.
Old 04-20-12, 09:27 PM
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GS4_Fiend
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If you put it in Neutral will it start?

Code 12 - you got an open in the CKP or CMP signal wire.
Old 10-25-12, 09:00 AM
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DPAXTON
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Did you figure out the problem? I am having the same problem. car will not turnover unless i press down on the starter relay. i put a new relay in but same problem.
Old 10-25-12, 01:30 PM
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steve2006
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There is a 7.5A "Starter Fuse" have you checked this is OK, if it is get someone to turn the ignition key to the start position and hold it there while you check pin 1 of the starter relay which should have 12 volts on it.
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