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TCM FUNCTION =NHAT0014S03 The function of the TCM is to: I Receive input signals sent from various switches and sensors. I Determine required line pressure, shifting point, lock-up operation, and engine brake operation. I Send required output signals to the respective solenoids. INPUT/OUTPUT SIGNAL OF TCM NHAT0014S04 Sensors and solenoid valves Function Input Park/neutral position (PNP) switch Detects select lever position and sends a signal to TCM. Accelerator pedal position sensor Detects accelerator pedal position as throttle valve position signal, and Closed throttle position signal Detects throttle valve’s fully-closed position and sends a signal from ECM Wide open throttle position switch Detects a throttle valve position of greater than 1/2 or full throttle and Engine speed signal From ECM. A/T fluid temperature sensor Detects transmission fluid temperature and sends a signal to TCM. Revolution sensor (VHCL/S SE-1) Detects output shaft rpm and sends a signal to TCM. Vehicle speed sensor (VHCL/S Used as an auxiliary vehicle speed sensor. Sends a signal when revolu- 3rd position switch Sends a signal, which prohibits a shift to D position, to the TCM. Power train revolution sensor Detects forward clutch drum rpm and sends a signal to TCM. Stop lamp switch Send the lock-up release signal to the TCM at time of D 4 (lock-up). Output Shift solenoid valve A/B Selects shifting point suited to driving conditions in relation to a signal Line pressure solenoid valve Regulates (or decreases) line pressure suited to driving conditions in rela- Torque converter clutch solenoid Regulates (or decreases) lock-up pressure suited to driving conditions in Overrun clutch solenoid valve Controls an “engine brake” effect suited to driving conditions in relation to A/T CHECK indicator lamp Shows TCM faults, when A/T control components malfunction. CAN Communication NHAT0285 SYSTEM DESCRIPTION NHAT0285S01 CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul- GI MA EM LC EC FE AX SU BR ST RS BT HA SC EL IDX OVERALL SYSTEM Control System (Cont’d) AT-29 |