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Home >> Toyota >> 2002 >> Corolla S, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 47 (Automatic Transmission Diagnosis - U340E & U341E) >> Diagnostic Tests >> DTC P1790: Shift Solenoid St Circuit Malfunction >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Toyota ECHO, 2002 Toyota Celica, 2001 Toyota ECHO, and 2001 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.

ECM sends a signal to shift solenoid ST to turn solenoid on and off. This controls 2nd brake timing by operating orifice control valve located in valve body. Solenoid is operated during application and release of reverse clutch. DTC is output when ECM detects solenoid is energized and resistance is 30 ohms or less, or when solenoid is not energized and solenoid resistance is 100 k/ohms or more. Possible causes:

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