System Overview: Components

Fig 1: Identifying Linear Pressure Solenoids In Transmission Control System

Courtesy of VOLVO CARS OF NORTH AMERICA.

The following components are included in the automatic transmission control system: 

• Transmission Control Module (TCM) - Controls activation/deactivation of the solenoids by means of processing the input signals from the transmission speed and temperature sensors. Also stores adaptive data and diagnostic trouble codes (DTC) and frozen values for diagnostics.
• Gear position indicator, integrated with Transmission Control Module (TCM) (4) - Provides Transmission Control Module (TCM) information on selected gear position.
• Solenoid - Controls engine braking on 1st gear.
• Solenoid - Controls engine braking on 1st gear.
• Lock-up solenoid - Controls the lock-up function and also used with certain shifting.
• Linear pressure solenoid - Controls transmission system pressure.
• Linear pressure solenoid - Controls transmission shift pressure and also used with certain shifting.
• Linear pressure solenoid - Controls transmission shift pressure and also used with certain shifting.
• Linear pressure solenoid - Controls transmission shift pressure and also used with certain shifting.
• Linear pressure solenoid - Controls transmission shift pressure and also used with certain shifting.
• Speed sensor, input shaft (1) - Provides Transmission Control Module (TCM) information on input shaft speed from the engine.
• Speed sensor, output shaft (2) - Provides Transmission Control Module (TCM) information on output shaft speed from the transmission.
• Oil temperature sensor (3) - Provides Transmission Control Module (TCM) information on transmission oil temperature.
• Gear Selector Module (GSM) - Provides Transmission Control Module (TCM) information on Geartronic position and winter mode (W) etc.