Ignition System: Testing and Inspection

Misfire Detection, Checking

Special tools and equipment







- VAS5051 with VAS5051/1

Test sequence
- Connect testing and information system VAS5051 and select vehicle system "01 - Engine electronics". Engine must be running at idling speed. Connecting VAS 5051 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 and press -Q- button to confirm input.

Indicated on display:


Read Measuring Value Block Q
Input display group number XXX


- Press buttons -0-, -1- and -4- to input "display group number 14" and press -Q- button to confirm input.

Indicated on display:


Read Measuring Value Block 14 ->
1 2 3 4


- Check misfire detection.

Display Group 014:

If the specified value is reached:
- Press -> button.

Indicated on display (function selection):


Rapid data transfer HELP
Select function XX


If specified value is not obtained:
- To change to display group 015, Press (Up Arrow) button.

Checking misfire recognition of the individual cylinder

Display on VAS5051:







- Check indication in display fields -1- to -4-.

Display Group 015:

- To change to display group 016, Press (Up Arrow) button.

Display on VAS5051:







- Check indication in display fields -1- to -4-.

Display Group 016:

- Exit function "08 - Read measured value block" by pressing <- key.

Evaluating display groups 014, 015 and 016 Display field:

Display Field 3: