Knock Recognition Control Limit, 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".

Test sequence
- Connect VAS5051 tester and select vehicle system "01 - Engine electronics". Engine must run at idle for this. Connecting VAS 5051 Scan Tool







Display on VAS5051:
- Select diagnostic function "08 - Read Measuring 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-.

Display Group 020:

- Press "08 - Read Measuring Value Block" to end function <- button.

Evaluation of ignition angle retardation