AUTOMATIC TRANSAXLE BLOCK DIAGRAM [JA5A-EL]

BME051700000T16

Electronic Control Item and Control

Control item

Contents

Shift control
• Detects engine load condition and vehicle speed. Shifts to the best gear position according to the programmed automatic shift diagram.
Line pressure control
• Generates line pressure matching the engine load condition and driving conditions. Optimizes line pressure for each shift. When the ATF temperature is low, automatically optimizes line pressure for quick clutch engagement.
Revers inhibition control
• When the shift lever is shifted to R position while the vehicle is running forward at approx. 30 km/h{19 mph} or more, the TCM turns the neutral shift solenoid valve on and drains the low and reverse brake hydraulic pressure. Due to this, the transaxle shifts to neutral.
Shift transient control
• Adjusts transient hydraulic pressure according to engine load and vehicle driving conditions when shifting using the pressure control solenoid, 2-4 brake solenoid valve, the high clutch solenoid valve, and each accumulator control valve.
• Temporarily lowers engine torque during shift (up and down) to improve shift feel
• The lock timing for the reduction brake band is controlled by the control of the reduction timing solenoid valve ON/OFF timing.
• The lock timing for the clutch brake is controlled by the control of shift solenoid A, B, and C ON/OFF timing.
Feedback control
• Corrects clutch engagement pressure and timing on drain side to compensate for changes in engine performance and changes in transaxle
TCC control
• Controls TCC according to the programmed TCC points
N-D select control
• When a driving range is selected from P/N, the fuel injection amount is controlled to prevent fluctuation in engine speed.
Slope mode control
• Changes the shift point to prevent frequent shifting up/down when climbing hills
OBD system
• Detects and/or memorizes failure of input/output part and transaxle condition

Component Description (Electronic Control)

Part name

Function

Input system
HOLD switch
• Selects driving modes (HOLD)
TR switch
• Detects selector lever ranges/positions
Input/turbine speed sensor
• Detects reverse clutch drum revolution speed
Intermediate sensor
• Detects output gear revolution speed
Vehicle speedometer sensor
• Detects parking gear revolution speed
TFT sensor
• Detects the ATF temperature
Brake switch
• Detects the brake pedal depressed
Cruise control module (in cruise actuator)
• When the cruise control is in use, the signal detects when the difference between the target speed and actual speed exceeds specification
CAN signal (PCM to TCM)
Throttle position signal
• Input throttle opening angle from PCM
Engine torque signal (without torque down)
• Input engine torque from PCM
Engine torque signal (with torque down)
• Input engine torque from PCM
Engine torque signal (loss torque)
• Input engine loss torque from PCM
Torque reduced signal
• Detects signals indicating torque down availability
Engine coolant temperature signal
• Input engine coolant temperature from PCM
Engine speed signal
• Input engine speed from PCM
Battery OFF signal
• Detect negative battery cable disconnected
Output system
ON/OFF type
Shift solenoid A
• Switches ON and OFF based on electric signals from the TCM, changes hydraulic circuit to control shifting
Shift solenoid B
• Switches ON and OFF based on electric signals from the TCM, changes hydraulic circuit to control shifting
Shift solenoid C
• Switches ON and OFF based on electric signals from the TCM, changes hydraulic circuit to control shifting
Reduction timing solenoid valve
• Switches ON and OFF based on electric signals from the TCM, changes hydraulic circuit to control shifting
Neutral shift solenoid valve
• Switches ON and OFF based on electric signals from the TCM, changes hydraulic circuit to control shifting
Duty type
Pressure control solenoid
• Switches ON and OFF based on electric signal (duty signals) from the TCM adjusts line pressure to match driving conditions
2-4 brake solenoid valve
• Switches ON and OFF based on electric signal (duty signals) from the TCM adjusts line pressure to match driving conditions
High clutch solenoid valve
• Switch ON and OFF based on electric signal (duty signals) from the TCM adjusts line pressure to match driving conditions
TCC solenoid valve
• Switch ON and OFF based on electric signal (duty signals) from the TCM to control TCC
HOLD indicator light
• Illuminates to indicate that the transaxle is in HOLD mode
• Flashes when failure is detected by diagnosis function
CAN signal (TCM to PCM)
Reduce torque signal
• Sends signals to the PCM during shifting
Range signal
• Output transaxle load condition to PCM
Turbine speed signal
• Output turbine speed to PCM
ATF temperature signal
• Output ATF high temperature signal to PCM
TCC signal
• Output TCC signal to PCM
Racing select signal
• Requests fuel cut when selector lever is shifted during racing
MIL indicate request signal
• Requests MIL illumination when failure is detected by diagnosis function