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.
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HOMESERVICE MANUALSVOLKSWAGEN1999GTI (1J1) V6-2.8L (AFP)REPAIR AND DIAGNOSISBODY AND FRAMELOCKSPOWER LOCKSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL TESTINGOUTPUT DIAGNOSTIC TEST MODE (DTM) (FUNCTION 03)
1999 Volkswagen GTI (1J1) V6-2.8L (AFP)
Output Diagnostic Test Mode (DTM) (Function 03)
1999 Volkswagen GTI (1J1) V6-2.8L (AFP)SECTION Output Diagnostic Test Mode (DTM) (Function 03)
Output Diagnostic Test Mode (DTM)
The components displayed in the Output Diagnostic Test Mode (DTM) can differ depending upon the equipment fitted to the vehicle. For example on vehicles without ATA there will be no step "1" as listed in the table below.
The Output Diagnostic Test Mode (DTM) activates the following components in the stated sequence:
Special tools, testers and auxiliary items
- Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3
- Adapter set VAG 1594
- Diode test lamp VAG 1527
- wiring diagram
Work sequence
- 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
Convenience System, Initiating on Board Diagnostic (OBD)
Indicated on display:
Rapid data transfer HELP
Select function XX
- Operate scan tool taking into account the information on the display:
- Input 03 for "Output Diagnostic Test Mode (DTM)" function.
- Switch off ignition and remove ignition key from ignition lock.
Indicated on display:
Rapid data transfer Q
03 Output Diagnostic Test Mode (DTM)
- Confirm entry with the Q button.
Indicated on display:
Output Diagnostic Test Mode (DTM) ->
Perform press button individual tests:
See table.
Output Diagnostic Test Mode (DTM) can be terminated by pressing the "C" button.
- Press -> button.
If a component does not function:
- Continue Output Diagnostic Test Mode (DTM) to the end.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.