Voltage Signal: Description and Operation
PURPOSEBecause engine operating requirements vary according to which transmission range the vehicle is operating in, Electronically Controlled Automatic Transmission (EC-AT) signals are used in ECU calculations for ignition timing, turbocharger control system, double throttle control system, and air injection system.
LOCATION
EC-AT control unit is behind kick panel on passenger side. Solenoid valves are on transmission.
OPERATION
EC-AT control unit sends ECU signals which are factored into electronic control functions as described above: reduce torque, slip lock-up, and transmission range position.