Shift Light: Description and Operation

DESCRIPTION
The shift indicator light is a device which is installed in the instrument panel to urge the driver to up shift at the proper moment. This insures operations for best fuel economy.

OPERATION
It turns on as soon as vehicle conditions become suitable for operation in the next higher gear, and turns off as the clutch is released for up shift.

The engine parameters used to activate the shift indicator light are engine speed, engine load and engine coolant temperature. The engine load is sensed as a function of Throttle Body (TB) position by a sensor built into the TB.

The shift indicator light turns on when the following conditions exist simultaneously:

1. Engine coolant temperature is hotter than -5°C.
2. TB is not in idle position.
3. The engine load, is not greater than the predetermined values.
4. The transmission gear is in any forward position other then 5th, that is, either of the two transmission switches (1st - 2nd switch and 3rd - 4th switch) is on. 1st - 2nd switch turns on when the transmission is in 1st - 2nd, and 3rd - 4th switch turns on when the transmission 3rd or 4th.
5. The clutch is engaged (clutch switch is "ON").