With Manufacturer's Scan Tool

Knock Control Stop, Checking

If a malfunction entry relating to "knock control stop reached" is made, perform the following checks:

Special tools and equipment







- VAS 5051 with VAS 5051/1

Test sequence

- Connect testing and information system VAS5051 and select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed. Connecting VAS 5051 Scan Tool

Display on VAS5051:







- Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051:







1 - Enter display group max. input value = 255 - Enter "020" for "display group number 020" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051:







- Check indication in display fields -1- to -4-.

Display Group 020:

- To change to display group 021, Press up-arrow button.

Display on VAS 5051:







- Check indication in display fields -1- and -2-.

Display Group 021:

- Exit function "08 - Read measured value block" by pressing <- button.

Evaluation of ignition angle retardation.