P1686 Lexus Transmission Control Module Power Up Temperature Sensor Circuit High Voltage
Possible causes
– Reprogram TCM and recheck code
– Replace Transmission Control Module (TCM) Sensor/body assembly one piece
– Replace Transmission Control Module (TCM) Sensor/body assembly one piece
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1686 Lexus Description
The Transmission Control Module (TCM) power up the temperature sensor is located inside of the control solenoid (w/body and TCM) valve assembly and has no serviceable parts. The TCM power up temperature sensor provides the temperature pof the TCM at TCM power up. This temperature readings is used in various shifting and diagnostic routines in the TCM software. This fault is handled inside the TCM and no external circuit are involved.
Lexus Vehicle:Lexus ES,Lexus GS,Lexus GX,Lexus HS,Lexus IS,Lexus LFA,Lexus LS,Lexus LX,Lexus RX,Lexus RX,Lexus SC,Lexus GS350,Lexus GS450H,Lexus IS250,Lexus GX460,Lexus IS350,Lexus LS460,Lexus LS600H,Lexus LX570,Lexus RX350