Ignition System: Testing and Inspection

Misfire Recognition, Checking

- Connect VAG1551 or VAG1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (engine running at idle). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1551 or VAG1552 Scan Tool" Testing and Inspection

Indicated on display


Rapid data transfer HELP
Selecting function XX


- Press buttons -0- and -8- to select "Read Measuring Value Block" (scan tool function 08), and press -Q- button to confirm input.

Indicated on display


Read Measuring Value Block
Input display group number XXX


- Press buttons -0-, -1- and -8- to input display group number 18 (018), and press -Q- button to confirm input.

Indicated on display (1-4 = display fields)


Read Measuring Value Block 18 ->
1 2 3 4


- Check specified values for misfire recognition (display fields 1-4):







- Press -3- button to advance to display group 19.

Indicated on display


Read Measuring Value Block 19 ->
1 2 3 4


- Check specified values for misfire recognition for bank 1 (display fields 1-4):







- Press -3- button to advance to display group 20.
- Check specified values for misfire recognition for bank 2 (display fields 1-4):







- Press button to advance program sequence.
- Press buttons -0- and -6- to select "End Output" (scan tool function 06), and press -Q- button to confirm input.

If displayed values in display groups 19 and 20 are outside the specified range:
- Check fuel level (too low)
- Check spark plugs
- Check fuel injectors. Refer to "Fuel Injectors, Checking", Testing and Inspection
- Check fuel injection volume Refer to "Fuel Injection Volume, Fuel Injector Leakage and Spray Pattern, Checking" Testing and Inspection
- Check ignition coils. Testing and Inspection
- Check power output stages. Ignition Coil Power Output Stages, Checking
- Check for mechanical malfunction