P1790 · blink 65 – ST SOLENOID VALVE MALFUNCTION
- System
- ECT U441E
- Dashboard light
- CHECK ENGINE (MIL) does NOT light (DTC stored in memory only)
- Applies to
- 4-speed A/T U441E. Not a PK fitment (the PK EPC lists only A246E and U340E). Other-market fitment unverified.
- Check-engine blink code
- 65
- Description
- ST SOLENOID VALVE MALFUNCTION
- Detection / symptoms
- Detection: ECU memorizes DTC P1790/65 if (a) or (b) condition below is detected once or more, but ECU does not start O/D OFF indi- cator light blinking. (a) Solenoid resistance is 30 W or lower (short circuit) when solenoid energized. (b) Solenoid resistance is 100 kW or higher (open circuit) when solenoid is not energized.
- Possible causes
- Transmission wire; Wire harness; ST solenoid valve; Engine ECU
- What to check
- Workshop check order (RM821E): INSPECT TRANSMISSION WIRE(ST) -> CHECK WIRE HARNESS AND CONNECTOR(Transmission wire − ECU) -> INSPECT SOLENOID ASSY, TRANSMISSION(ST)
- Confidence
- high (official Toyota RM821E)
From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights