SYSTEM DIAGRAM 
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Toyota Tundra Service Manual > Automatic Transmission System: Shift Solenoid "D" Control Circuit Low (Shift Solenoid Valve S4) (P0982,P0983)
DESCRIPTION Shifting from 1st to 6th is performed in combination with ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shif ...
