Throttle Control 4, 6 and 8 Cylinder Engines

Throttle valve regulation on these engines is carried out through an additional throttle valve (ADS II) installed in front of the primary throttle valve. The same effect is achieved, as on the EML equipped vehicles, by shutting off the air supply before the primary throttle valve. The engine's power is reduced and traction or stability is restored.

This system was introduced with the M60 engine and used a separate control module for the ADS II throttle valve. Later versions incorporate the ADS II actuator control as part of the engine control module's function.

With either system, the traction control module determines that throttle valve regulation is required to restore traction or maintain stability. A signal is sent to the ADS control engine control module and the throttle valve is closed. The traction control module receives feedback from the ADS engine control module that the requested control function has been carried out.





The placement of the main throttle and auxiliary throttle in the intake air tract vary by engine configuration. Regardless of configuration, the main and auxiliary throttle housings provide the following functions:

Main Throttle Housing:
The main throttle housing works identically to the non ASC+T equipped vehicle. The throttle plate is closed by spring pressure and opens when the throttle pedal is pushed to the floor.

Auxiliary Throttle Housing:
The auxiliary throttle housing is connected to the main throttle housing upstream in the intake air tract. The auxiliary throttle plate is held open by spring pressure. The throttle plate is connected to the ADS II motor by a bowden cable.

When the ASC+T control module requires throttle control it actuates the ADS II motor which pulls the throttle plate closed independently of the driver's control.

Each throttle housing has a has a separate throttle position sensor for individual monitoring of the main and auxiliary throttle plate position. The signals are input to the DME and ASC+T control modules respectively