Knock Recognition Control Stop, Checking

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







- Also check ignition angle retardation of the individual cylinders.

Check ignition angle retardation of the individual cylinders
- Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01.

Engine must run at idle for this.

When indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.

When indicated on display:


Read Measuring Value Block Q
Input display group number XXX


- Press buttons -0-, -2- and -0- to select "display group number 020" and press -Q- button to confirm input.

When indicated on display:


Read Measuring Value Block 20 ->
1 2 3 4


- Check indication in all display fields.







- Press -C- button.

When indicated on display:


Read Measuring Value Block Q
Input display group number XXX


- Press buttons -0-, -2- and -1- to select "display group number 021" and press -Q- button to confirm input.

When indicated on display:


Read Measuring Value Block 21 ->
1 2 3 4


- Check indication in display field 1 and 2.








- Press -C- button.

When indicated on display:


Read Measuring Value Block Q
Input display group number XXX


- Press buttons -0-, -2- and -2- to select "display group number 022" and press -Q- button to confirm input.

When indicated on display:


Read Measuring Value Block 22 ->
1 2 3 4


- Check indications in display field 3 and 4.








- Press -C- button.

When indicated on display:


Read Measuring Value Block Q
Input display group number XXX


- Press buttons -0-, -2- and -3- to select "display group number 023" and press -Q- button to confirm input.

When indicated on display:


Read Measuring Value Block 23 ->
1 2 3 4


- Check indications in display field 3 and 4.







- Press -C- button.

When indicated on display:


Read Measuring Value Block Q
Input display group number XXX


- Press buttons -0-, -2- and -4- to select "display group number 024" and press -Q- button to confirm input.

When indicated on display:


Read Measuring Value Block 24 ->
1 2 3 4


- Check indications in display field 3 and 4.







Evaluation display groups 020/021/022/023/024 - ignition angle retardation