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