Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1999 Volkswagen GTI (1J1) V6-2.8L (AFP)FACTORY OEM SERVICE PROCEDURE
Check Control Module Version
Check Control Module Version
- Connecting scan tool, initiating On Board Diagnostic (OBD).
Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks", under "Restraint Systems", Testing and Inspection
Refer to "Scan Tool Testing, Initiating on Board Diagnostic (OBD)". Scan Tool Testing
- Switch on ignition.
- Press key -1- for "Rapid data transfer" mode.
- Switch on printer with Print button (warning lamp in button lights up).
- Press keys -0- and -1-.
Indicated on display:
Rapid data transfer Q
01-Check Control Module Version
- Confirm entry with the Q button.
The control unit identification will be shown on the scan tool VAG 1551 display, e.g.:
1C0962258 XX Cent. Lock. 0001 ->
Coding XXXXX: WSC XXXXX
Breakdown of the display:
- Upper line Part No. of control module system designation
(XX2) Cent. Locking 0001)
- Lower line Code number dealer code number 1)
1) Will be automatically stored in the control unit when entering the system.
2) A number or number/letter combination (03 or 6Q, or others) indicate a correct programming of the control unit.
- Press -> key.
Indicated on display:
Rapid data transfer HELP
Select function XX
NOTE:
- If one of the malfunction messages opposite appears in the display, the possible causes of the malfunction can be printed out with the HELP key.
Rapid data transfer HELP
Control unit does not answer!
- Ignition must be switched on.
Rapid data transfer HELP
K wire not switching to B+1
- Faults have occurred at the start of or during the program (external interference?).
Rapid data transfer ->
No signal from control unit!
- Check diagnosis wires as well as voltage supply and Ground connection.
Rapid data transfer ->
Fault in communication build up
- Press keys -0- and -6- to end the output.
Indicated on display:
Rapid data transfer Q
06 End output
- Confirm entry with the Q button.
Indicated on display:
Rapid data transfer HELP
Enter address word XX
- Switch off ignition.
- Disconnect connector to scan tool VAG 1551.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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