Pre-Drive Check

The pre-drive check has following tasks:

• Zero point adaptation of the throttle potentiometers.
• Checking freedom of movement of the throttle valves and electronic accelerator pedal control circuit.
• Checking the safety cutout and the return springs of the electronic accelerator pedal and throttle valves.

This check is conducted every time KL15 is activated. The full load adaptation stop is learned in a new ECM the first time KL15 is recognized.

The pre-drive check is conducted in 3 phases:

• Phase 1: The throttle valves are closed by the EDR actuator. The position of the throttle potentiometer on the EDR is determined.
• Phase 2: The throttle valves are opened 3% by the EDR actuator. The position of the throttle potentiometer on the throttle valve shaft is determined.
• Phase 3: The throttle valves are opened by approx. 20%. The EDR actuator is switched off. The throttle valves are closed by spring force (a mechanical clicking sound can be heard while the throttle valves are closing).