K2–12
AUTOMATIC TRANSAXLE
Electronic Control Item and Control
Component Description (Electronic 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
Part name Function
Input system 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
M range switch • Detects selector lever shifted M range
Up switch • Detects up shift in M range
Down switch • Detects down shift in M range
CAN signal 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
4 wheel speed signal • Input wheel speed from ABS HU/CM or DSC HU/CM
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