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Home >> Cadillac >> 2019 >> ATS V >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0658, P0659, P2718, P2720, P2721, P2727, P2729, P2730, P281B, P281D, or P281E >> Circuit/System Description

Circuit/System Description

For an overview of the component/system, refer to:

Circuit Description
Control - Terminal 1 @ X175 The output circuit is switched to ground to activate the component. This is a normally closed valve that is controlled on/off.
Control - Terminal 13, 14 @ X175 The output circuit is switched to ground to activate the component. The output is PWM controlled.
Control - Terminal 18 @ X175 The output circuit is switched to 12 V to enable the component(s).
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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