Page text (OCR transcript)
ELECTRONIC CONTROL SYSTEM
The electronic control system for the A340E automatic transmission 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
for the vehicle to continue functioning when a malfunction occurs.
CONSTRUCTION
The electronic control system can be broadly divided onto three groups; the sensors, ECM and actuators.
SENSORS
No. 1 Vehicle Speed Sensor
No. 2 Vehicle Speed Sensor
O/D Direct Clutch Speed Sensor r
Crankshaft Position Sensor
Camshaft Position Sensor No.1, No.2 2
Park/Neutral Position Switch
Neutral Start Signal
Shift lever Position Signal
Main (Sub) — throttle Position Sensor
Idling Signal
Throttle Position Signal
Engine Coolant temp. Sensor
A/T Fluid Temp. Sensor
O/D Main Switch
Cruise Control ECU
Kick–Down Switch
Stop Light Switch
Pattern Select Switch
ECM
SP1
SP2
NCO
NE
G1
G2
NSW
R,2,L
IDL
VTA
THW
OIL
OD2
OD1
KD
STP
M
+B
Battery
ACTUATORS
S1
S2
SLU
SLN
SLT
No.1 Solenoid Valve
No.2 Solenoid Valve
No.3 Solenoid Valve
No.4 Solenoid Valve
No.5 Solenoid Valve
Engine Torque Control (ESA)
IGT1,IGT2
IGF1,IGF2
Igniters
Ignition Coils
Distributors
Spark Plugs
OD2
O/D OFF Indicator Light
(Diagnostic Trouble Code
Display)
EFI
TRC
TRAC ECU
