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Old 10-23-2021, 11:44 AM #1
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TPS Adjustment Calibration: Idle Voltage

Does anybody know the idle voltage at Sensor wire on Throttle Position Sensor (TPS)?

I replaced the TPS (OEM brand new) but had no knowledge back then that it has to be at a certain parameter.

While Ignition is OFF, I back-probed top (positive - sensor wire) and bottom (negative) wires on the TPS by inserting two tiny needles/pins and attaching those to a volt meter.

Then turned the ignition on and had 0.54 V Fully closed. At fully open throttle, I got 3.77 V. I adjusted the idle voltage to 0.62 V and that made the fully open throttle voltage to 3.89 V. An immediate difference I noticed: A random vibration (about 10-15 second intervals) at idle I had before was no more. Too early to confirm, but something I noticed.

Let me know if you know the exact voltage at sensor wire on TPS at idle please.
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Last edited by nissanh; 10-23-2021 at 12:51 PM.
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Old 10-25-2021, 11:24 AM #2
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Quote:
Originally Posted by nissanh View Post
Does anybody know the idle voltage at Sensor wire on Throttle Position Sensor (TPS)?

I replaced the TPS (OEM brand new) but had no knowledge back then that it has to be at a certain parameter.

While Ignition is OFF, I back-probed top (positive - sensor wire) and bottom (negative) wires on the TPS by inserting two tiny needles/pins and attaching those to a volt meter.

Then turned the ignition on and had 0.54 V Fully closed. At fully open throttle, I got 3.77 V. I adjusted the idle voltage to 0.62 V and that made the fully open throttle voltage to 3.89 V. An immediate difference I noticed: A random vibration (about 10-15 second intervals) at idle I had before was no more. Too early to confirm, but something I noticed.

Let me know if you know the exact voltage at sensor wire on TPS at idle please.
At Wot it's 3.5V- 4.7 volts.
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Old 10-25-2021, 10:24 PM #3
nissanh nissanh is offline
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Thank you!
I learn all these electronics by watching a lots of youtube videos. Time well spent online! Wanna thank Ivan at PineHollowAutoDiagnostics, Eric O at SMA and Danner at Scanner Danner!
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1997 5vzfe 4Runner 4x4 (aka Hilux Surf)
2000 2uzfe 100 Series Land Cruiser
2021 Tacoma TRD Off-Road 4x4 6-speed
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