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I dont understand what else could be wrong with the speed control... i have replaced what i thought was everything that controls it....

so, if when in high speed mode its fine, what could be the problem? the fuel pump?

Nope, its fine after i do that

The ls400 uses the control relay to switch the speeds i have found out, thats why i was saying if someonone could remove the little lid on there control relay and rev the car and tell me how much reving it takes for theres to switch over, that would be a great help :)

I changed the gas filter and ran injector cleaner a couple times before, still didnt help :(

Can someone do me a favor? take the little lid off of the control relay and rev the motor and tell me how much rev does it take to make it switch back and forth? this would be a great help and would tell me whether its the electrical side or the fuel pump :)

Just checked, Nope, the switch isnt stuck....

I took the cap off the fuel pump control relay and when the engine is reved high enough it clicks over, which is what its suppost to do i have read in a diagram, but i dont think its switching in the right times or so, but i changed the main engine Ecu... also, i have a used fuel pump which...

I just noticed the relay will open and close when u really make the car go vroom vroom with fast throlltle movements, so could there be a sensor dirty? i replaced the throttle position sensor already too..

hmmm, what in the world else could be wrong then? i replaced the Ecu of the car, so i dont know what else it could be...

I have replaced the Ecu, the main relay the circuit opening relay, the fuel pump relay, and the fuel pump! and still it wont switch back to 12 volts, there has to be a reason for this! what else controls the fuel pump!!! and i am going to order those diagrams soon, will they tell about this?

would anyone else have anymore pdf files to my car? they are helpfull, thanks,,

Thanks for that pdf file, i saved it :) but i still dont find the speed control relay only the main one, is there even a speed control relay on this car of mine?

thanks :) , i checked under the fuse place and couldnt find the speed control relay, unless its called something else one the diagram..

Hello, i have a 1991 Lexus LS400, heres the problem, i know this car has a dual speed fuel pump, well one day, the car was acting like it was low on gas when u give it gas it acted as if it was struggling to get gas, i check the voltage at the fuel pump and it read 9 volts, well i know when the...