Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 33. AUTOMATIC TRANSMISSION 13. Transmission Control Module (TCM)
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W1860BE.book Page 82 Tuesday, January 28, 2003 11:01 PM
TRANSMISSION CONTROL MODULE (TCM)
AUTOMATIC TRANSMISSION
13.Transmission Control Module (TCM)
The TCM receives various sensor signals and determines the running conditions of the vehicle. It
then sends control signals to each solenoid according to the preset gearshift characteristic data,
lockup operation data, and transfer clutch torque data (duty ratios).
A: CONTROL SYSTEM
1. MPT MODELS
Control items Input signals
Shifting control Ordinary shift control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed rpm
Inhibitor switch
ABS-in-operation control ABS signal
Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Brake switch
Hydraulic oil temperature control ATF temperature sensor
Reverse inhibition control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
Shift pattern (Base/Power) select control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
Hold control Inhibitor switch
Grade control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Brake switch
Inhibitor switch
Engine speed
Intake manifold pressure
Lockup control Ordinary lockup control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Inhibitor switch
Smooth control Throttle position sensor
Hydraulic oil temperature control ATF temperature sensor
4AT-82
W1860BE.book Page 83 Tuesday, January 28, 2003 11:01 PM
TRANSMISSION CONTROL MODULE (TCM)
AUTOMATIC TRANSMISSION
Control items Input signals
Oil pressure control Ordinary pressure control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Inhibitor switch
ATF temperature sensor
Shifting control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Torque converter turbine speed sensor
Inhibitor switch
ATF temperature sensor
Starting control Engine speed
ATF temperature sensor
Inhibitor switch
Learning control Shift solenoid 1
Shift solenoid 2
Rear vehicle speed sensor
Front vehicle speed sensor
Throttle position sensor
Torque converter turbine speed sensor
ATF temperature sensor
AWD transfer clutch control Ordinary transfer control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
ATF temperature sensor
FWD switch
1 range control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
Slip detection control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Steering control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
ABS-in-operation control ABS signal
Rear vehicle speed sensor
Front vehicle speed sensor
Brake switch
4AT-83
W1860BE.book Page 84 Tuesday, January 28, 2003 11:01 PM
TRANSMISSION CONTROL MODULE (TCM)
AUTOMATIC TRANSMISSION
2. VTD MODELS
Control items Input signals
Shifting control Ordinary shift control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Inhibitor switch
ABS-in-operation control ABS signal
Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Brake switch
Hydraulic oil temperature control ATF temperature sensor
Reverse inhibition control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
Shift pattern (Base/Power) select control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
Grade control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Brake switch
Inhibitor switch
Engine speed
Mass air flow
Lockup control Ordinary lockup control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Inhibitor switch
Smooth control Throttle position sensor
Hydraulic oil temperature control ATF temperature sensor
4AT-84
W1860BE.book Page 85 Tuesday, January 28, 2003 11:01 PM
TRANSMISSION CONTROL MODULE (TCM)
AUTOMATIC TRANSMISSION
Control items Input signals
Oil pressure control Ordinary pressure control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Inhibitor switch
ATF temperature sensor
Shifting control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Torque converter turbine speed sensor
Inhibitor switch
ATF temperature sensor
Starting control Engine speed
ATF temperature sensor
Inhibitor switch
Learning control Shift solenoid 1
Shift solenoid 2
Rear vehicle speed sensor
Front vehicle speed sensor
Throttle position sensor
Torque converter turbine speed sensor
ATF temperature sensor
AWD multi-plate clutch (LSD) Ordinary transfer control Throttle position sensor
control Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
ATF temperature sensor
1 range control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
Slip detection control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Steering control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
ABS-in-operation control ABS signal
Rear vehicle speed sensor
Front vehicle speed sensor
Brake switch
Base brake control Throttle position sensor
Front vehicle speed sensor
Brake switch
4AT-85
W1860BE.book Page 86 Tuesday, January 28, 2003 11:01 PM
TRANSMISSION CONTROL MODULE (TCM)
AUTOMATIC TRANSMISSION
B: SCHEMATIC DIAGRAMS
1. SOHC MODELS
4AT-86
W1860BE.book Page 87 Tuesday, January 28, 2003 11:01 PM
TRANSMISSION CONTROL MODULE (TCM)
AUTOMATIC TRANSMISSION
ABS signal Speedometer circuit
FWD switch (non-turbo model) AT diagnosis signal
Engine speed signal FWD indicator light (non-turbo model)
Inhibitor switch AT OIL TEMP light
Cruise control signal Torque control signal 1
Battery voltage Torque control signal 2
Torque control cut signal Dropping resistor A (non-turbo model)
Intake manifold pressure signal (non-turbo model) Dropping resistor B (non-turbo model)
Brake switch
Mass air flow signal (turbo model)
Transmission control module
Line Lock-up 2-4 brake Shift Shift Low clutch 2-4 brake Transfer
pressure duty duty solenoid 1 solenoid 2 timing timing duty
duty solenoid solenoid solenoid solenoid solenoid solenoid
Throttle position
Transfer
Transmission control valve control valve
sensor
ATF Servo
temperature mechanism
sensor Front vehicle Rear vehicle
speed sensor speed sensor
Oil pump Servo
mechanism
Torque
converter
turbine speed
Torque converter
Multi-plate clutch
Multi-plate clutch
Multi-plate brake
sensor
One-way clutch
drive gear shaft
Planetary gear
(LSD for turbo
Input shaft
Reduction
Reduction
drive gear
Engine
model)
clutch
Final drive gear
(front wheels)
driven gear
Propeller shaft
Drive shaft
Reduction
Tires
Final drive gear
: Power transmitting route Automatic transmission
Drive shaft
: Hydraulic pressure control circuit
: Mechanical signal
: Electrical signal Tires (rear wheels)
AT-00870
4AT-87
W1860BE.book Page 88 Tuesday, January 28, 2003 11:01 PM
TRANSMISSION CONTROL MODULE (TCM)
AUTOMATIC TRANSMISSION
C: SHIFTING CONTROL
The TCM performs gear shifting control according to driving conditions by using the shift point char-
acteristic data stored in its memory. Appropriate solenoids are operated at the proper timing corre-
sponding to the shift pattern, throttle position, and vehicle speed for smooth shifting.
NOTE:
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