Misfire Recognition, Checking

Misfire recognition, checking

Required special tools and test equipment
- VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable

Checking
- Connect VAG 1551/1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at idle). [1][2]Scan Tool Connecting and Initial Checks

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 HELP
Input display group number XXX


- Press buttons -0-, -1- and -4- to input display group number 14 (014), and press -Q- button to confirm input.

Indicated on display (1-4 = display groups)


Read Measuring Value Block 14->
1 2 3 4


- Compare displayed values with specified values for misfire recognition (display fields 3-4):

Display Group 14:

If displayed values are OK:
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Check readiness code.Readiness Code Reading

If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code.Readiness Code, Generating

If displayed values are NOT OK:
- Press -C- button.
- Press buttons -0-, -1- and -5- to input display group number 15 (015), and press -Q- button to confirm input.

Indicated on display (1-4 display groups)


Read Measuring Value Block 15 ->
1 2 3 4


- Compare displayed values with specified values for misfire recognition (display fields 1-4):

Display Group 15:

If displayed values are OK:
- Press -C- button.
- Press buttons -0-, -1- and -6- to input display group number 16 (016), and press -Q- button to confirm input.

Indicated on display (1-4 = display groups)


Read Measuring Value Block 16->
1 2 3 4

- Compare displayed values with specified values for misfire recognition (display fields 1 and 4):

Display Group 16:

Evaluation of display groups 15 and 16

Display Groups 15 And 16: