With Manufacturer's Scan Tool

Misfire Detection, Checking

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required







- VAG 1551 Scan tool (or VAG 1552 Scan tool) with VAG 1551/3 adapter cable

NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.

Test prerequisites







- The fuses must be OK.
- The battery voltage must be at least 11.5 V.
- Engine mechanically OK.
- No DTCs must be stored in DTC memory.
Reading Diagnostic Trouble Codes

Test sequence
- Carry out test drive.

Observe the valid safety precautions when carrying out a road test
Technician Safety Information.

- Connect VAG 1551 Scan tool (or VAG 1552) and select engine electronics control module with the "Address word" 01. When doing this the engine must be running at idling speed: (Connecting scan tool and selecting engine electronics control module).
[1][2][3]Connecting VAG 1551 Scan Tool

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- for function "Read measured value (data) block" and confirm entry with -Q- button.

Indicated on display:


Read measured value block
Input display group number XXX


- Press buttons -0-, -1- and -4- for "Display group number 14" and confirm entry with -Q- button.

Indicated on display: (1 to 4 = display zones)


Read measured value block 14 ->
1 2 3 4


- Check the misfire detection status in display zone 4.
Specification: "activated"
- Check the total number of misfires in display zone 3.
Specification: 0

If the specifications are obtained:
- Press the -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
- Switch off ignition.

If the specifications are not obtained:
- Change to display group 15 as follows:
- Press button 3 ((VAG 1551) or button (up arrow)(VAG 1552).

Indicated on display: (1 to 4 = display zones)


Read measured value block 15 ->
1 2 3 4


- Check the misfire detection status in display zone 4.
Specification: "activated"
- Check display zones 1 to 3 for detected misfires in cylinders cylinders 1 to 3.
Specification: 0

If the specifications are not obtained:
- Press the -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
- Switch off ignition.
- Evaluating display group 15 and display group 16.
Display Groups 0-9 (Basic Functions)

If the specifications are obtained:
- Change to display group 16 as follows:
VAG 1551: Press button 3
VAG 1552: Press = button

Indicated on display: (1 to 4 = display zones)


Read measured value block 16
1 2 3 4


- Check the misfire detection status in display zone 4.
Specification: "activated"
- Check display zones 1 to 3 for detected misfires in cylinders cylinders 4 to 6.
Specification: 0
- Press the -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
- Switch off ignition.

If the specifications are not obtained:
- Evaluating display group 15 and display group 16.
Display Groups 0-9 (Basic Functions)