Passat L4-1984cc 2.0L DOHC (9A) (1990)
^ black terminal to black connector 1
^ white terminal to brown or white connector 2
^ blue terminal not used
^ start engine and let idle
^ observe VAG 1551 display value or "SYSTEM IN BASIC SETTING"
^ use the following codes to obtain the functions as shown
^ 1 to obtain "RAPID DATA TRANSFER" mode
^ 01 to select Function 01 "ENGINE ELECTRONICS"
^ 04 to select Function 04 "SYSTEM IN BASIC SETTING"
^ CO to select individual channel from group display
^ observe value displayed in channel 9
^ must be 5
If NO
^ see Function08/Channel 9 display, interpreting
Checking using VAG 1367 Engine tester
Timing point value is displayed directly on tester
^ checking value: 4 to 8~ Before TDO
Checking with timing light
^ direct strobe onto flywheel opening
^ checking value: 4 to 8~ Before TDC
Adjusting
^ adjust timing if necessary by loosening and turning distributor
^ adjusting value: 6 +/- 1~ Before TDC
If OK
^ enter O6 into VAG 1551 diagnostic tester for "DATA TRANSFER ENDED" input