Throttle Valve Actuator Recognition

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2002 Mercedes-Benz CL500, 2001 Mercedes-Benz CL500, 2000 Mercedes-Benz SL500, 2000 Mercedes-Benz S430, and 2000 Mercedes-Benz ML55. However, it is still accessible from the selected car via links, so may be relevant.

The end stops (closed throttle) and Wide Open Throttle (WOT) are determined by the throttle valve actuator and stored by the Engine Control Module (ECM). After replacing an ECM or actuator, mechanical stop and WOT must be determined and recorded again. Current learned data must be erased using scan tool.

When a new ECM is connected to vehicle for the first time, ECM performs a self-adaptation of lower mechanical end stop when ignition is first turned on.

The following requirements must be present for ECM to self-adapt to lower mechanical end stop:

Transmission in Park or Neutral
Vehicle not moving
Engine off
Engine coolant temperature 41-212°F (5-100°C)
Accelerator pedal not depressed

When all conditions are met, turn ignition on for at least 60 seconds, then turn ignition off for at least 10 seconds. The learned value is stored in memory only after the first 10 start cycles. If battery voltage is disconnected after the 9th start cycle, the re-learn process must be performed again.