So today my LS400 died on me. I was pulling out of a parking lot, and as i was taking a left turn out i realized i had no power steering, look down at my rpm's and bam its at 0. Try to start the car, nothing it just cranks/turns over.
Had absolutely no issues before hand, ran completely mint. and suddenly it dies out of no where
I thought it was the battary, tried jumping it, nothing
I have half a tank of gas cant be low fuel
SO FAR I HAVE
No fuel(going to engine), no spark, no check engine light coming on. Changed the ecu twice no difference checked all relays, fuses all in order

No check engine light, checked and changed the bulb so I know that's good
no power going to the fuel pump relay
Or distributor so I have no spark or fuel
Relays and fuses are all good

Ecu has power going to it,but there's no signal coming out of the ecu to tell it to give power to spark plugs or fuel pump

edit: Car is Completely stock if that matters

 

Did you check out the fusebox under the hood? Also I believe this vehicle has fusable links adjacent to the battery. My service manual has not yet arrived so I hope this gives you something to go on until a more informed member can chime in and be more specific.

 

how do you know there is no spark? i am leaning towards a faulty or bad fuel pump which is common. do you hear the pump priming?

 

How about other things turning on when you turn on the key switch? It could be a problem.
https://www.clublexus.com/forums/ls4...ont-prime.html
Scroll to post #7
To check fuel pump operation

To test igniter


The ignition switch is feed by fuses, pretty much everything else is relay driven. The bigger fuses just behind the battery are the fusable links, flip the batter cover to see what is what there is a chart inside it.


Actually I goofed up here with the above, but its still usefull. The die suddenly and will crank but not start and the no signal conditions, sounds like a crank position sensor.

 

Yes i have, ive checked all fuses and relays and all seem to be okay.

 

Ive checked for power to the distributor and there is no power going there. The ECU has power going to it, but does not send out a signal to send power to the fuel pump or distributor. & No the fuel pump does not prime.

 

Haven't you had any strange behaviors of your car before it died on you such as longer time to start, slow response, any jerk or something like that?
I suspect a failed fuel pump or the disabling function of a circuit opening relay.
One thing you'd better know is that the circuit opening relay disables the voltage supply to the fuel pump when the ECU detects abnormalities.

 

Nothing at all, car ran flawlessly before this happened.

If anything to note, i was in a drive-thru when this happened so the car was still on and was never turned off. It was only when i was taking a left turn out of the drive thru that i realized that i had no power steering. It seemed like the car had turned itself to acc mode.

 

Were there any check engine codes? It is most likely the crankshaft angle sensor. It's been awhile since I visited CL but please search my post regarding this issue.

 

Here is the thread. Good luck!

https://www.clublexus.com/forums/ls4...g-running.html

 

It looks like some posts are missing from this thread. I thought he said he got it running and it was a coil connector or something ??????????

 

No check engine light comes on, i cant read engine codes if there are any..But before this happened i had nothing.

And no, i have not been able to fix it yet. I will be checking the crankshaft angle sensor

 

I had a similar issue. Left hand turn and it died. Mine turned out that the timing belt had jumped three teeth.also dont forget to check the conditon of the engine harnesses on the front of the engine. The clips that anchor it down get brittle and break. This can cause these wires to rub on the accessory belt. It can play havoc with the signals from the crank and cam sensors.

 

Did this ever get resolved?