DTC P0121 Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.
This is the repair procedure of the throttle position sensor.

READ OTHER DTC OUTPUT (IN ADDITION TO DTC P0121)

Result

DIAGNOSTIC TROUBLE CODE CHART

Display (DTC output)	Proceed to
P0121	A
P0121 and other DTCs	B

HINT:

If any other codes besides P0121 are output, perform the troubleshooting for those codes first.

B : GO TO RELEVANT DTC CHART

A : REPLACE THROTTLE BODY