SC400 Wont crank over by key, I need a expert!
#1
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Lexus Test Driver
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From: Sideways on the Yellow Brick Road! < Thats KS!
SC400 Wont crank over by key, I need a expert!
Hey guys, I have a problem I was hoping to get some input on. My car has been running great until this morning, I shut it off and went to start it and nothing.
Here is what I know its not.
The battery is good!-I have checked it
The starter is good!-I can jumper the starter poles at the starter relay and start it.
The starter relay is good-I checked it out.
It is not the neutral/park saftey switch- I allready bypassed it.
It is not getting power too the starter relay trigger coil, it just does nothing. everything else acts normal. It acts just like a clutch/park/netral safty switch but I checked. What else could it be? If anyone has a electrical diagram of a 97 sc400 they could send me to help that would be great! Anyone ever had this?
Here is what I know its not.
The battery is good!-I have checked it
The starter is good!-I can jumper the starter poles at the starter relay and start it.
The starter relay is good-I checked it out.
It is not the neutral/park saftey switch- I allready bypassed it.
It is not getting power too the starter relay trigger coil, it just does nothing. everything else acts normal. It acts just like a clutch/park/netral safty switch but I checked. What else could it be? If anyone has a electrical diagram of a 97 sc400 they could send me to help that would be great! Anyone ever had this?
#5
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Lexus Test Driver
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From: Sideways on the Yellow Brick Road! < Thats KS!
I am starting to wonder about the Anti-Deterrent ECU:anyone know how it functions?
#6
Scott, that side of the relay is powered by the neutral safety switch when the ignition switch is engaged. Have you double checked your connection you made for the NSS?
Im doubtful that its the theft deterrent ECU. Do your locks work (lock/unlock)?
Im doubtful that its the theft deterrent ECU. Do your locks work (lock/unlock)?
#7
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Lexus Test Driver
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From: Sideways on the Yellow Brick Road! < Thats KS!
Well, That was my first thought. I checked it and even put a jumper right down on on the transmission plug, still nothing, is there another place closer to the fuse block I could jump it?
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#10
In electronics, where the electricity stops that's where your problems begin. On the Supra, the ground from the start relay is supplied by the theft deterent ecu. One thing goes wrong and the car won't start. Here's what I did to bypass:
Assuming you've checked all fuses,
First, give the start relay a dedicted ground to bypass the theft ecu. Turn the key and see if the car starts.
If not, locate the ign wire and tap into it. Run that hot line to the 12V trigger on the relay. Turn the key again.
If nothing, run the 12V trigger to battery + and TAP on the positive lead. The starter should fire.
If not, run a larger thick line from the relay starter power to the starter itself and again TAP on the battery lead. The starter should fire.
Thanks Scott, let me kow if it works.
Eric
Assuming you've checked all fuses,
First, give the start relay a dedicted ground to bypass the theft ecu. Turn the key and see if the car starts.
If not, locate the ign wire and tap into it. Run that hot line to the 12V trigger on the relay. Turn the key again.
If nothing, run the 12V trigger to battery + and TAP on the positive lead. The starter should fire.
If not, run a larger thick line from the relay starter power to the starter itself and again TAP on the battery lead. The starter should fire.
Thanks Scott, let me kow if it works.
Eric