TPS only seeing 3.7v at WOT

[joegreen]

2000 lexus es300 tps only sees 3.7v at wot. Vehicle computer shows 74% throttle opening at wot. Does that seem correct? Car seems to accelerate ok but i dont want to be leaving performance on the table. The tps sweep is nice with no dead spots. It starts at around .6 and goes to 3.7. Shouldn't it be closer to 5v?

 

[mk378]

I assume this is a mechanical cable from the gas pedal to the throttle body. Engine off, have someone hold the gas pedal to the floor while you check if the lever on the throttle body can move further open. If it can, adjust the cable accordingly. It must still return all the way to the stop at idle though.

 

[14Accent]

Toyota lists the following to test the TPS sensor:

OHM's @ 68 degrees F, as measured between terminals VTA and E2:

Closed throttle - 200-6,300

WOT - 2,000-10,200

There is a footnote that says: Disconnect vacuum hose from throttle opener and apply vacuum to allow throttle to fully seat.

I did find a voltage spec, which is .3V to 1.0V at closed throttle, 2.7V to 5.2V at WOT. Your numbers look dead on, according to the service information.