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Home >> Toyota >> 2001 >> Corolla CE, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Automatic Transmission Diagnosis - U140E & U140F) >> Diagnostic Tests >> DTC P0768: Shift Solenoid Circuit Malfunction >> Circuit Description

Circuit Description

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Shifting from 1st to overdrive is performed in combination with on and off cycle of shift solenoids SL1 and SL2. Solenoids are controlled by ECM. If an open or short circuit occurs in either solenoid, ECM controls remaining shift solenoids to allow vehicle to operate and ensures smooth transaxle shifting. See Figure. ECM checks for an open or short circuit in shift solenoid S4. DTC will set when ECM detects solenoid is energized and resistance is 8 ohms or less, or when solenoid is not energized and solenoid resistance is 100 k/ohms or more. Possible causes are:

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