Es300 & RX300

Manufacturer does not list procedure for Throttle Position (TP) sensor adjustment. Only information available is for checking resistance of TP sensor.
Disconnect electrical connector from TP sensor. Note electrical terminals on TP sensor. See Fig 1. Apply vacuum to throttle opener.
Using ohmmeter, check resistance between specified terminals in relation to throttle position. See THROTTLE POSITION SENSOR RESISTANCE (ES300 & RX300) table. Replace components as necessary if resistance is not within specification.

THROTTLE POSITION SENSOR RESISTANCE (ES300 & RX300) ⁽¹⁾

Throttle Position

Terminals

Ohms

Fully Closed

VTA & E2

200-6300

Fully Open

VTA & E2

2000-10,200

VC & E2

2500-5900

⁽¹⁾	Apply vacuum to throttle opener before checking TP sensor.

Fig 1: Identifying Throttle Position (TP) Sensor Terminals (ES300 Shown; RX300 Is Similar)