Ignition Timing Control, Checking

IGNITION TIMING CONTROL, 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
- Engine oil temperature at least 80 °C (176 °F)

Test sequence
- Connect VAG 1551 scan tool (VAG 1552) and select "Engine Electronics" address word 01. When doing this the engine must be running at idle speed. Refer to "On-Board Diagnostics II With VAG 1551". 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 -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 the measured values for ignition timing control (display fields 1-4).





Continuation

- Check engine operating conditions. Refer to "On-Board Diagnostics II With VAG 1551". Testing and Inspection
- Check throttle valve control module. Refer to "Throttle Valve Control Module, Checking". Testing and Inspection
- Check knock sensor and knock control. Refer to "Knock Sensor and Knock Control, Checking". Testing and Inspection

If the specification is again not attained:
- Replace Engine Control Module (ECM) -J220-.
- Read the readiness code. If DTC memory has been erased, repair must be verified via appropriate display group See Readiness code, creating. Refer to "On-Board Diagnostics II With VAG 1551". Testing and Inspection