DTC P0840-00: Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance [09/2023 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0840-00)
- Read the DTCs using the GTS.
Powertrain > Transmission > Trouble Codes
Result
Result Proceed to P0840-00 and P0840-23, P0840-24, P0840-49, P0840-87, P0840-96, P1738-23, P1738-24 or P1738-96 are output A P0840-00 and P0770-71, P08DE-7F, P2713-71 or P27C5-7F are output B P0840-00 and DTCs other than those listed above are output C
Result:
A
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ]
Result:
C
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ]
Result:
B
See step 2
- Read the DTCs using the GTS.
- CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)
Pre-procedure1
- Disconnect the transmission wire connector.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition Result C65-2 (VC) - C65-3 (EPTO) Ignition switch ON 4.89 to 5.11 V V Result
Proceed to OK NG
Post-procedure1
- None.
Result:
NG
REPLACE TCM. Refer to REMOVAL [09/2023 - ]
Result:
OK
See step 3
- INSPECT SOLENOID (SL7), (SLT), (SC4) AND (SR) VALVE
Refer to INSPECTION [09/2023 - ]
Result
Proceed to OK NG Result:
OK
REPLACE TRANSAXLE ASSEMBLY WITH MOTOR. Refer to REMOVAL [09/2023 - ]
Result:
NG
REPLACE TRANSMISSION VALVE BODY ASSEMBLY. Refer to REMOVAL [09/2023 - ]