Engine Wont Crank...Just Spins Over
Thread Starter
Driver School Candidate
Joined: Jul 2008
Posts: 5
Likes: 0
From: Georgia
Engine Wont Crank...Just Spins Over
hey i have a 93 SC400 and the engine wnt crank on it...i have a 1990 Thunderbird and it did the same thing until i replaced to cam sensor. Do you know how or if that is a possible solution to fixing the lexus...the car ran fine until just recently...thanks for the help
Greg
Greg
most likely not a sensor. check the main fuse box for the efi fuse and relay. when you turn the key from the acc to start position the efi relay should click. if it does not you have a problem...or at least you found part of it.
couple of things come to mind here. the coil may be the issue. or the crankshaft position (CKP) sensor. camshaft sensor could possibly be another, but more often than not its the CKP.
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Driver
Joined: Mar 2007
Posts: 108
Likes: 2
From: Alabama
a few posts below at https://www.clublexus.com/forums/sho...d.php?t=366142 there was other suggestions, including this one:
If the starter is spinning the motor faster than normal, mine did that and it appeared to be the Main ECU connector. Can't swear by it, but having traced out the possibilities and reading what others posted about this problem, solved it by swapping the ECU. Just decided to clean the connection instead of replacing the ECU and it has worked fine since. Many parts in the electrical/computer world are changed due to simple old connections that need to be cleaned.
I also cleaned the igniter connections at the same time, but it makes more sense that the ECU would have been the culprit.
Also make sure you do a good search here on CL. Odds are someone will have already discussed your exact problem already.
Good Luck,
Tim
If the starter is spinning the motor faster than normal, mine did that and it appeared to be the Main ECU connector. Can't swear by it, but having traced out the possibilities and reading what others posted about this problem, solved it by swapping the ECU. Just decided to clean the connection instead of replacing the ECU and it has worked fine since. Many parts in the electrical/computer world are changed due to simple old connections that need to be cleaned.
I also cleaned the igniter connections at the same time, but it makes more sense that the ECU would have been the culprit.
Also make sure you do a good search here on CL. Odds are someone will have already discussed your exact problem already.
Good Luck,
Tim
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Thread Starter
Driver School Candidate
Joined: Jul 2008
Posts: 5
Likes: 0
From: Georgia
ok... i took the car to the local toyota dealer and they said that it was possibly a bad computer. But now i will check the connection like you did. The only problem now is that i dont know where the ECU is located nor how the remove it. Thanks for the reply!
Driver
Joined: Mar 2007
Posts: 108
Likes: 2
From: Alabama
Using the search tool, you will probably find all kinds of stuff on the main ecu. It is pretty easy to get to under the passenger side carpet directly below the glove box, in a black plastic cover iirc. I also unbolted the ecu from the metal floor and tightened it back securely. Be real careful when fooling around with the connectors that you don't accidentally break anything, and never forget to disconnect the battery negative prior to messing with any of it. If in doubt, let a professional do it. If you really need a new ECU, check the classified section in CL. They should have one at a fair price.
Good Luck,
Tim
Good Luck,
Tim
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