Shift Solenoid Valve A,B,C (1, 2, 3): Notes

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Torque Converter Clutch (TCC) Enable Solenoid

Courtesy of GENERAL MOTORS CORP.

The shift solenoid (SS) valves are normally open valves that mounts into the transmission case. The SS valves control the modulator pressure to the shift valves, as commanded by the powertrain control module (PCM). The SS valves are all identical. These SS valves work together in a combination of ON and OFF sequences in order control various shift valves. The PCM uses numerous inputs to determine which solenoid state combination the transmission should be in. Refer to Shift Solenoid Valve State and Gear Ratio .

Clutch Pressure Control (CPC) Solenoid Valve A, B (1,2) and TCC Pressure Control Solenoid

Fig 2: Clutch Pressure Control (CPC) Solenoid Valve A, B (1,2) and TCC Pressure Control Solenoid

Courtesy of GENERAL MOTORS CORP.

The clutch pressure control (PC) solenoid valve 1 regulates modulator pressure based on the current flow commanded from the powertrain control module (PCM). The PCM outputs varying amount of amperage as necessary for gear change, and the PC solenoid valves supply oil pressure proportional to the current to the PC valve 1. The PCM monitors the current flowing through the solenoid and performs feedback control.
The clutch pressure control (PC) solenoid valve 2 regulates modulator pressure based on the current flow commanded from the powertrain control module (PCM). The PCM outputs varying amount of amperage as necessary for gear change, and the PC solenoid valves supply oil pressure proportional to the current to the PC valve 2. The PCM monitors the current flowing through the solenoid and performs feedback control.
The TCC pressure control (PC) solenoid valve regulates modulator pressure based on the current flow commanded from the powertrain control module (PCM). The PCM outputs varying amount of amperage as necessary for TCC application, and the PC solenoid valves supply oil pressure proportional to the current to the PC valve 2. The PCM monitors the current flowing through the solenoid and performs feedback control.

The PCM measures the current amperage flowing through the PC solenoid valves and uses feedback control to compensate the difference between the actual current amperage and the commanded amperage.