P1790 2001 TOYOTA ECHO - ST Solenoid Valve Circuit Malfunction
- Open or short in shift solenoid valve ST circuit
- Shift solenoid valve ST
When is the code detected?ECU memorizes DTC P1790 if (a) or (b) condition below is detected once or more, but ECU does not start MIL 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.
- Engine Light ON (or Service Engine Soon Warning Light)
P1790 2001 Toyota Echo DescriptionShift solenoid valve ST is switched ON-OFF by a signal from ECM so that let in or out timing of 2nd brake is adjusted by operating orifice control valve. Therefore, shift solenoid valve ST operates when letting in or out reverse clutch. f it is broken, the shift shock becomes big.
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