Throttle Position Switch: Description and Operation

Throttle Position Switch





Description

The position switch provides the control module with information on the position of the throttle: idling speed, partial throttle or wide open throttle.

In the LH 2.4.2 system the position switch is replaced by a throttle position sensor.

A Idling speed

When the throttle is closed (idling speed or engine braking), the microswitch (4) closes and ground potential is obtained on idling speed connection 8.

Partial throttle

When the throttle is activated, the microswitch (4) opens and the ground potential from idling speed connection 8 disappears.

B Wide open throttle

When the throttle angle is greater than 720, the wide open throttle switch (3) closes and ground potential is obtained on full-load connection 6. After a calculation performed by the control module, this provides full-load enrichment of the fuel-air mixture.

Starting from cold

If the accelerator is floored when the engine is started at temperatures below -20°C, the control module issues an order to reduce the amount of fuel injected into the engine. This prevents the engine from becoming flooded.

(LH 2.4, 2.4.1 and 2.4.2 only)
If repeated attempts to start are made, the enrichment cycle will not be activated for starting from cold afresh. This prevents exceptionally generous enrichment and a consequently flooded engine.