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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P2718, P2720, P2721, P2727, P2729, P2730, P281D, Or P281E: Transmission Control Solenoid Valve 4/5/8 Control Circuit(s) >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Description
Control - Terminal 1 @ X175 The output circuit is switched to ground to activate the component.
Control - Terminal 13, 14 @ X175 The output is PWM controlled.
Component Description
K71 Transmission Control Module The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation.
Q77 Transmission Control Solenoid Valve A solenoid valve is an electro-mechanically operated valve. The valve is controlled by an electric current through the solenoid.
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