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TCM FUNCTION =NCAT0014S03 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 NCAT0014S04 Sensors, switches and solenoid valves Function Input PNP switch Detects select lever position and sends a signal to TCM. Throttle position sensor Detects throttle valve position and sends a signal to TCM. Closed throttle position switch Detects throttle valve’s fully-closed position and sends a signal to TCM. Wide open throttle position switch Detects a throttle valve position of greater than 1/2 of full throttle and sends Engine speed signal From ECM. A/T fluid temperature sensor Detects transmission fluid temperature and sends a signal to TCM. Revolution sensor Detects output shaft rpm and sends a signal to TCM. Vehicle speed sensor Used as an auxiliary vehicle speed sensor. Sends a signal when revolution Overdrive control switch Sends a signal, which prohibits a shift to “D 4 ” (overdrive) position, to the TCM. ASCD control unit Sends the cruise signal and “D 4 ” (overdrive) cancellation signal from ASCD control unit to TCM. Stop lamp switch Releases lock-up system when depressing pedal in lock-up condition. Output Shift solenoid valve A/B Selects shifting point suited to driving conditions in relation to a signal sent 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 O/D OFF indicator lamp Shows TCM faults, when A/T control components malfunction. Control Mechanism NCAT0015 LINE PRESSURE CONTROL NCAT0015S01 TCM has various line pressure control characteristics to match the GI MA EM LC EC FE CL MT AX SU BR ST RS BT HA SC EL IDX OVERALL SYSTEM Control System (Cont’d) AT-29 |