Throttle Position Sensor (Tps); Manifold Pressure Sensor (Map); Manual Bi Starter - Royal Enfield Bullet Classic EFI Service Manual

Throttle Position Sensor (TPS):

TPS is used to monitor the position of the throttle and is located on the butterfly spindle so that it can
directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and
therefore provides a variable resistance depending upon the position of the butterfly valve and hence
throttle position can be sensed by the ECU. The sensor signal is used by the ECU as an input to its
control system. The ignition timing and fuel injection timing (and potentially other parameters) are
altered depending upon the position of the throttle, and also depending on the rate of change of the
position.
The ECU uses the throttle valve position to know:
The mode in which the engine is operating. i.e. idle, part throttle, wide-open throttle etc.
Emission controls at wide-open Throttle (WOT).
Air-fuel ratio correction.
Power increase correction.
Fuel cutoff control.

Manifold Pressure Sensor (MAP):

The MAP provides instantaneous manifold pressure information to the ECU. This is necessary to
calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate
the appropriate fuel flow to the engine through the injector.

Manual BI Starter

Located in the throttle body and operated manually through a lever on the handle bar LH. When the
lever is pulled down, a cable pulls up the spring loaded piston in the throttle body.
Helps in providing additional air into the engine during cold start, for better idling RPM, till the engine
operating temperature is attained.
06-7