Throttle Position (TP) Sensor

To adjust main TP sensor on ES300, GS300 or SC300, disconnect vacuum hose from throttle opener. Apply vacuum to throttle opener to fully seat throttle. On all vehicles, disconnect TP sensor connector. Connect ohmmeter between terminals IDL (or IDL1 or IDL2) and E2 of TP sensor connector. See Fig 1.
Insert appropriate size feeler gauge between throttle stop screw and lever. If continuity is as specified, TP sensor is adjusted. See THROTTLE POSITION SENSOR ADJUSTMENT table. If continuity is not as specified, loosen TP sensor mounting screws. Rotate TP sensor until continuity is as specified. Tighten mounting screws. Recheck adjustment.

THROTTLE POSITION SENSOR ADJUSTMENT

Application & Throttle Plate Position ⁽¹⁾⁽²⁾

Continuity Between Terminals IDL & E2

ES300

.014" (.35 mm)

Yes

.028" (.70 mm)

GS300 & LS400

Main TP Sensor

.016" (.40 mm)

Yes

⁽³⁾

Sub-TP Sensor (With TRAC)

.012" (.30 mm)

Yes

.020" (.50 mm)

SC300

Main TP Sensor

.018" (.45 mm)

Yes

.022" (.55 mm)

Sub-TP Sensor (With TRAC)

.014" (.35 mm)

Yes

.020" (.50 mm)

SC400

Main TP Sensor

.016" (.40 mm)

Yes

.026" (.65 mm)

Sub-TP Sensor (With TRAC)

.012" (.30 mm)

Yes

.020" (.50 mm)

⁽¹⁾	Insert appropriate size feeler gauge between throttle lever and throttle stop screw.

⁽²⁾	If adjusting main TP sensor on ES300, GS300 and SC300, disconnect vacuum hose from throttle opener. Apply vacuum to throttle opener to fully seat throttle.

⁽³⁾	On GS300, use feeler gauge with thickness of .024" (.60 mm). On LS400, use feeler gauge with thickness of .026" (.65 mm).

Fig 1: Throttle Position Sensor Connector Terminal ID