Ignition System: Testing and Inspection

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). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551/VAG 1552 Scan Tool" Testing and Inspection

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. Refer to "Moniters, Trips and/or Drive Cycle/Checking Readiness Code" Testing and Inspection

If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. Refer to "Moniters, Trips and/or Drive Cycle/Generating Readiness Code" Testing and Inspection

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: