DTC P0120-11: Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground [03/2022 - 03/2023]: Procedure
WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. 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)
- 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 HINT:
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
Refer to INITIALIZATION [11/2021 - ]
Result:
A
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY. Refer to REMOVAL [11/2021 - ]
Result:
B
See step 2
- Read the values displayed on the GTS
- CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
- 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 B18-2 (VC) - B48-109 (VCTA) Always Below 1 Ω B18-1 (VTA) or B48-108 (VTA1) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
REPLACE ECM. Refer to REMOVAL [11/2021 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR