Toyota Camry Manual page 195

AX2–8
4. ELECTRONIC CONTROL SYSTEM
GENERAL
The electronic control system for the A541 E automatic transaxte provides extremely precise
control of the gear shift timing and lock–up timing in response to driving conditions as sensed
by various sensors located throughout the vehicle and in response to the engine's running
condition. At the same time, the ECM control reduces vehicle squat when the vehicle starts out
and gear shift shock. The electronic control system is also equipped with a self diagnosis system
which diagnoses malfunctions of electronically controlled components and warns the driver, and
a fail–safe system which makes it possible for the vehicle to continue functioning when a
malfunction occurs.
CONSTRUCTION
The electronic control system can be broadly divided into three groups; the sensors, ECM, and
actuators.
SENSORS
Crankshaft Position Sensor
Engine Speed Sensor
Throttle Position Sensor
Idling Signal
Throttle Position Signal
Engine Coolant Temp. Sensor
Park/Neutral Position Switch
Neutral Start Signal
Shift Lever Position Signal
No. 1 Vehicle Speed Sensor
Combination Meter
Direct Clutch Speed Sensor
Pattern Select Switch
O/D Main Switch
Stop Light Switch
Cruise Control ECU
AUTOMATIC TRANSAXLE –
ECM
IDL,VTA
NSW, R
2., L
SP 1
NC
OOD2
STP
OD 1
OPERATION
S
Shift Solenoid Valve No. 1
SZ
Shift Solenoid Valve No.2
SL
Shift Solenoid Valve SL
SLN
Shift Solenoid Valve SLN
Engine Torque Control (ESA)
O/D OFF indicator Light
Data Link Connector 3
(For OBD2)
ACTUATORS
Igniter
Ignition Coils
Spark Plugs