Page text (OCR transcript)
AT-8
A340E (2JZ-GTE) AUTOMATIC TRANSMISSION - OPERATION
4. 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 sen-
sors located throughout the vehicle and in response to the engine's running condition.
In addition, the ECM control reduces vehicle squat when the shift lever is moved from N to D.
The electronic control system is also equipped with a self diagnosis system which diagnoses malfunc-
tions 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 actua-
tors.
SENSORS ECM ACTUATORS
Pattern Select Switch M
S1 No.1 Solenoid Valve
RPM Sensor Ne
S2 No.2 Solenoid Valve
Cam Position Sensor G1
G2
SLU No.3 Solenoid Valve
Park/Neutral Position Switch
• Neutral Start Signal NSW
• Shift Lever Position Signal R, 2, L
SLN No.4 Solenoid Valve
Throttle Position Sensor
• Idling Signal IDL ECM
• Throttle Position Signal VTA
SLT No.5 Solenoid Valve
O/D Switch OD2
IGt1, IGt2
Cruise Control ECU OD1
IGf1, IGf2 Engine Torque Control (ESA)
No.1 Vehicle Speed Sensor SP1
Igniters
No.2 Vehicle Speed Sensor SP2
Ignition Coils
O/D Direct Clutch Speed Sensor NCO
Distributors
Kick-Down Switch KD
Spark Plugs
ECT Sensor THW
OD2 O/D OFF indicator Light
Stop Light Switch STP (Diagnostic Trouble Code Display)
A/T Fluid Temp. Sensor OIL
EFI
TRAC ECU
TRC
+B
Battery
V03616