Basic adaptation of pedal position sensor

In order to compensate for production-related tolerances in the pedal position sensor (PWG) system, the PWG limit stop (idle point and kick-down limit stop) are determined in a basic adaptation-learn mode. For this reason, it is necessary when replacing the EMLIIIS control unit or the pedal position sensor to carry out PWG basic adaptation in order to adapt the new tolerances. To ensure this step is carried out, the engine will not accept the throttle system before PWG basic adaptation has been carried out.

The EMLIIIS control unit assumes the start status for learn mode when the PWG basic adaptation values are deleted by one of the following conditions:

• A new variant is coded in the EMLIIIS control unit; this is only possible with the encoding program "encoding ZCS" via the DIS or MoDiC testers.
  
• The pedal position sensor (PWG) is unplugged at ignition ON so that all 3 signals are detected as faulty
  
• The PWG adaptation values are reset by means of the corresponding instruction on the DIS or MoDiC testers
  

The PWG basic adaptation procedure is described both in the diagnosis program of the EMLIIIS system as well as in the encoding program "encoding ZCS".

Only after PWG basic adaptation has been carried out correctly are the learn words stored in 2 EEPROMs in the EMLIIIS control unit and sensing of the driver's request is enabled.

Note

The defect code memory in the EMLIIIS control unit is cleared automatically after successful PWG basic adaptation when the variant was newly coded or the PWG unplugged beforehand. Therefore, read out the defect code memory or print out the test code beforehand to ensure no defect information is lost.