Testing TP Sensor

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Lexus SC 430, 2003 Lexus RX 300, 2003 Lexus LX 470, 2003 Lexus LS 430, and 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

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 TP SENSOR RESISTANCE (RX300) table. Replace TP sensor as necessary if resistance is not within specification.

TP SENSOR RESISTANCE (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