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TPS only seeing 3.7v at WOT #5215190 09/17/19 11:39 AM
Joined: Mar 2013
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joegreen Offline OP
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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?


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
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Re: TPS only seeing 3.7v at WOT [Re: joegreen] #5215242 09/17/19 12:53 PM
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mk378 Offline
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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.

Last edited by mk378; 09/17/19 12:54 PM.
Re: TPS only seeing 3.7v at WOT [Re: joegreen] #5215418 09/17/19 04:26 PM
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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.


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