Ignition Timing: Testing and Inspection

Ignition Timing, Checking

Special tools, testers and auxiliary items
- VAG 1551/1552 Scan Tool with VAG 1551/3 adapter cable

Test conditions
- Electrical consumers switched off (radiator coolant fan must not run during the check)
- Air conditioner switched off

Test sequence
- Connect VAG 1551 Scan Tool ((VAG 1552) and select "Engine Electronics" address word 01. Engine must be running at idle speed.

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 -0- to input display group 010 and press -Q- button to confirm input.

Indicated on display (1-4 = Display fields)

Read Measuring Value Block 10 ->
1 2 3 4

- Check measured value in display field 3:
Specification: 0 to 5 degree
- Check measured value in display field 4:
Specification: 0 to 12 degree BTDC (max ± 2.0 degree deviation from display field 3

If specifications not obtained, Checking throttle valve control module. Testing and Inspection

If specifications obtained:
- Generate readiness code.
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.