W 250 Pickup V8-5.9L VIN Z (1991)
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Torque Converter Clutch Solenoid: Description and Operation
Transmission Electrical Connections (3 Speed, With Lock-up)
On vehicles equipped with an A-999 transmission (Non-California only), the engine controller controls the locking up of the torque converter through the
lock-up solenoid. The engine controller controls this solenoid by applying and removing the ground from its circuit.