DTC P0720-31: Output Speed Sensor No Signal [10/2017 - 09/2019]: Procedure
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2024 Lexus IS 350, 2024 Lexus IS 300, 2023 Lexus IS 350, 2023 Lexus IS 300, and 2022 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT TRANSMISSION REVOLUTION SENSOR (SP2) INSTALLATION
- Check the transmission revolution sensor (SP2) installation.
OK
The installation bolt is tightened properly and there is no clearance between the sensor and transmission case.
*a OK *b NG Result
Proceed to OK NG
Result:
NG
SECURELY INSTALL TRANSMISSION REVOLUTION SENSOR (SP2) OR REPLACE TRANSMISSION REVOLUTION SENSOR (SP2). Refer to INSTALLATION [04/2013 - ]
Result:
OK
See step 2
- Check the transmission revolution sensor (SP2) installation.
- INSPECT TRANSMISSION REVOLUTION SENSOR (SP2)
- Disconnect the F55 transmission revolution sensor (SP2) connector.
*a Component without harness connected
(Transmission Revolution Sensor (SP2)) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 560 to 680 Ω Result
Proceed to OK NG
Result:
NG
REPLACE TRANSMISSION REVOLUTION SENSOR (SP2). Refer to COMPONENTS [04/2013 - ]
Result:
OK
See step 3
- Disconnect the F55 transmission revolution sensor (SP2) connector.
- CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (SP2) - ECM)
- Disconnect the F102 ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition F102-72 (SP2+) - F102-73 (SP2-) 20°C (68°F) 560 to 680 Ω F102-72 (SP2+) - Body ground Always 10 kΩ or higher F102-73 (SP2-) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
REPLACE ECM. Refer to COMPONENTS [10/2017 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR