DTC P0120-11: Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
- READ VALUE USING GTS (THROTTLE POSITION SENSOR NO. 1 VOLTAGE)
Pre-procedure1
- Read the values displayed on the GTS.
Powertrain > Engine > Data List
Tester Display Throttle Position Sensor No. 1 Voltage - Disconnect the throttle body with motor assembly connector.
- Compare the value of the Data List item Throttle Position Sensor No. 1 Voltage after disconnecting the throttle body with motor assembly connector to the value when the connector was connected.
Result
Result Proceed to Changes from less than 0.56 V to higher than 4.535 V A Does not change from less than 0.56 V B
Post-procedure1
- None.
Result:
A
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
B
See step 2
- Read the values displayed on the GTS.
- CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
Pre-procedure1
- Disconnect the throttle body with motor assembly connector.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Result B11-2 (VC) - B27-109 (VCTA) Always Below 1 Ω Ω B11-1 (VTA) or B27-108 (VTA1) - Body ground Always 10 kΩ or higher kΩ Result
Proceed to OK NG
Post-procedure1
- None.
Result:
OK
REPLACE ECM. Refer to REMOVAL [10/2022 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR