aj510

thanks so i tested the output it was erratic on the TPS sensor so now i will change it hope it fixes it but do you know how to adjust it when I put the New TPS on like some DIY tutorials, all the DIYs I see are early 90s LS400 different Engine?

So do I test this with the car running or off or it doesn't matter?

So now I am still getting P0120 code which is TPS pedal position sensor!So with a Ohmmeter, I tested the RESISTANCE of TPS Sensor, the Throttle Control Motor, and the PPS Pedal Position Sensor, They ALL came out GOOD. So I thought of cleaning the throttle body? Do you think if the Throttle body is dirty it will give me this P0120 code? Or maybe its a ECM problem? And I want to clean the Throttle Body anyway to just to try eliminate idle problems So does anyone have PICTURES or VIDEOS of 1998-2000 LS400 Do It Yourself Tutorials? Because I read some people messing up sensors hoses etc. trying to clean the Throttle Body!

I found your post after your request by PM so here is the doc you asked for that describes how to test the PPS and TPS. THANKS man right on ;)

Where Did You get the PPS ? Do You have any reference Site so I can get it online ? Yeah, I got the PPS replaced. 349 for the part. Lame, but the ride is so much better now. Hey so when your PPS was going out did you get a check engine light? I think mines going out too

thank you see that's what life is about helping people I'll try it out and see what happens thank you

Billy already gave you the link. He's a professional mechanic with decades of experience. Don't ask for help again when its been given. Report back if it works or doesn't after you've tried it. Asking the same question over and over is the definition of ...... its not the same question. their was 3 codes the one he helped me with was a switch for the transmission if you read it. I don't understand i ask for help and then i get someone cheer leading for billy lol. well thanks curiousB for the reminder of the link for one of my 3 problems i guess I'll PM billy or lexmex

Can you help me out then!? I am having problems with this vsc off cel crap when I'm in stop and go traffic it comes on then I'm in LIMP mode wont accelerate just idles slowly moving, i tried all the things people said tighten gas cap, disconnect battery for 20 minutes, etc. someone help because its dangerous when I'm at the stop light and stuck on limp driving like 2mph in busy traffic with kids in the car. Thanks In Advance

I ERASE THE CODES AND THE LIGHT STILL COMES ON VSC OFF AND ENGINE LIGHT, YES YOU ARE RIGHT ABOUT THE SHIFTER SOMETIMES I HAVE TO WIGGLE IT TO GET THE COMPUTER OR SENSORS TO KNOW ITS IN DRIVE BECAUSE ON THE DASH THE "D" POSITION DOESN'T LIGHT UP GREEN LIKE ITS SUPPOSE TO. DO YOU THINK I CAN CHANGE THE SWITCH MY SELF OR DO I HAVE TO TAKE IT TO A SHOP? IF I CAN, CAN YOU POST ME SOME INFO HOW TO DIY, THANKS.

SOMETIMES WHEN I START MY 1998 LS400 WITH 125,000 MILES ON IT THE VSC OFF AND ENGINE LIGHT COMES ON, ALSO WHEN I PUT IT IN DRIVE AND PUSH THE GAS PEDAL IT DOES NOT REACT SO I TURN OFF THE CAR AND START IT AGAIN TO SEE IF IT WILL MOVE THEN IT TAKES ME MORE THAN A FEW STARTS FOR THE CAR TO MOVE WHILE IN THE DRIVE POSITION. I DON'T KNOW IF MY BATTERY IS CAUSING IT TO DO THIS OR A SENSOR ETC. PLEASE SOMEONE HELP. THESE ARE THE CODES I FOUND MAYBE CAUSING THIS P0120 P0121 P1780