Knock Recognition Control Stop, Checking

Knock Recognition Control Stop, Checking

The following tests must be performed when a DTC is stored that relates to "knock recognition control limit reached".

Work sequence
- Connect VAS5051 tester, Vehicle Diagnostic, Testing and Information System VAS 5051, Connecting and Selecting Functions and select vehicle system "01 - Engine electronics". Engine must run at idle.







Display on VAS5051:
- Select diagnostic function "08 - read measured value block" in selection -1-.







Display on VAS5051:
1 - Enter display group. Max. input value = 255
- Select function "020" in button field -2- for "display group number 020" and press Q button to confirm input.







Display on VAS5051:
- Check knock control in display fields 1 to 4.







- Press <- button to end function "08 - Read measuring value block".

Evaluation of ignition angle retardation