Work sequence
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen GTI, 1998 Volkswagen Jetta, 1998 Volkswagen GTI, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Open ashtray and remove, then slide cover for diagnostic connections to left (arrow).
- Connect VAG 1551/1552 scan tool with VAG 1551/3 adapter cable.
Depending on desired function:
- Switch ignition on or start engine: see ENGINE CONTROL MODULE (ECM) FUNCTIONS .
NOTE:
- If the display does not show as indicated in the work sequence:
See VAG 1551 scan tool operating instructions
- If due to an input malfunction "Error in communications link" is displayed, disconnect wire from VAG 1551/1552 scan tool, reconnect and repeat work step.
- Operate VAG 1551/1552 scan tool taking into account information on the display.
- Press button -1- to select "Rapid data transfer" operating mode 1.
- Press buttons -0- and -1- to select "Engine Electronics" address word 01 and press -Q- button to confirm input.
The VAG 1551 scan tool display will show the control module identification; for example:
- 021 906 259B Part no. of the control module (for latest control module version Parts catalog)
- MOTRONIC M5.9 = Fuel injection and ignition system
- Coding 00001 Coding variants
Coding variants:
ECM CODING SPECIFICATION
| Coding | For following vehicles |
|---|---|
| 00000 | Golf/GTI/Jetta VR6 with manual transmission |
| 00001 | Golf/GTI/Jetta VR6 with automatic transmission |
NOTE:
Correct engine control module number details and coding are displayed only with the engine running at idle speed.
If the coding differs from the vehicle version, then:
- Check engine control module coding: see CODE CONTROL MODULE (SCAN TOOL FUNCTION 07) .
- Press --> button.
Indicated on display
- For additional steps, see repair procedures.