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