Ignition System: Testing and Inspection

Misfire Recognition, Checking

Special tools and equipment
- V.A.G 1551 Scan Tool (or VAG 1552 mobile scan tool) with VAG 1551/3 cable

Test sequence
- Connect V.A.G 1551 scan tool (VAG 1552). Start engine and select Engine Control Module (ECM) using address word 01. Refer to Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting V.A.G 1551 Scan Tool [1][2][3]Connecting VAG 1551 Scan Tool

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.

Indicated on display

Read Measuring Value Block
Input display group number XXX

- Press 0, 1 and 4 for function "display group number 14", and then press Q to exit from input mode.

Indicated on display (1 - 4 = display fields)

Read Measuring Value Block 14 ->
1 2 3 4

- Check total number of misfires in display field 3.
- Check status of misfire identification in display field 4.






If specified values are obtained:
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
- Switch ignition off.

If specified values are not obtained:
- Change to display group 15 as follows:
- Press button -3- (V.A.G 1551) or up arrow button (VAG 1552)

Indicated on display (1 - 4 = display fields)

Read Measuring Value Block 15 ->
1 2 3 4

- Check misfires in display fields 1 - 3.
- Check status of misfire identification in display field 4.






If specified values are obtained:
- Change to display group 16 as follows:
- Press button -3- (V.A.G 1551) or up arrow button (VAG 1552).

Indicated on display (1 and 4 = display fields)

Read Measuring Value Block 16 ->
1 4

- Check misfires in display fields 1 - 3.
- Check status of misfire identification in display field 4.






- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
- Switch ignition off.

Evaluation of display group 15 and 16, display fields 1 - 3 -total misfires producing emissions cyl. 1- Cyl. 6