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MAIN RELAY CONTROL OPERATION

BHE014000140T09

• When the ignition switch is turned to the ON position, the main relay turns on and power is supplied to sensors and devices.

• When the ignition switch is turned from on to off, a main relay on command signal is received the main relay turns on and the following actions take place:

  1. Throttle valve control: Fully closed throttle learning function (See DRIVE-BY-WIRE CONTROL OPERATION.)
  2. Ignition switch off function of the metering oil pump control (See METERING OIL PUMP CONTROL OPERATION.)
  3. After-cooling function of the electrical fan control (See ELECTRICAL FAN CONTROL OPERATION.)

• When the on request signal from the controls stop, the main relay turns off.