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): Notes
1999 Audi A6 QuattroSECTION Notes
NOTE:
- Component location of activated components, see A/C SYSTEM COMPONENTS (IN ENGINE COMPARTMENT) and A/C SYSTEM COMPONENTS (IN PASSENGER COMPARTMENT) .
- The Output Diagnostic Test Mode (DTM) can be carried out more than once if necessary.
- If components marked with an * malfunction, DTCs for these components can be stored in DTC memory.
- Checking the "Idle Air Control" (IAC) regulation function, see IDLE AIR CONTROL (IAC) REGULATION, INITIATING OUTPUT DIAGNOSTIC TEST MODE (DTM)
- During output DTM, the vehicle must not be moved and the engine speed must be lower than 3000 RPM.
- During output DTM, the air conditioning control functions are switched off. Depending on A/C Control Head -E87- version, all segments, control lights in buttons as well as the button illumination of -E87- are displayed or dark.
- The output DTM sequence for A/C Control Heads -E87- are different for vehicles up to model year 2001 and from model year 2002.
- For Audi allroad, the change-over of the A/C system is not performed with the model year change 2001 to 2002, instead it is a running change (implementation open, for vehicles with 4.2 Liter engine with start of production).
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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.