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.
Output Diagnostic Test Mode (DTM), activating: Notes
The output Diagnostic Test Mode (DTM) activates the following components in the stated sequence:
1 - Evaporative Emissions (EVAP) canister purge regulator valve N80
2 - Secondary Air Injection (AIR) solenoid valve N112
3 - Secondary Air Injection (AIR) pump relay J299
4 - Intake Manifold change-over valve N156
5 - Leak Detection Pump (LDP) V144
Special tools, testers and auxiliary items required
- Scan Tool (ST) VAG 1551 or mobile scan tool VAG 1552 with adapter cable VAG 1551/3
- Test box VAG 1598/31
- Multimeter (Fluke 83 or equivalent)
- Voltage tester VAG 1527B
- Adapter set VW 1594
- Wiring diagram
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.