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) (function 03): Notes
- Observe the following for the output Diagnostic Test Mode (DTM)
- The A/C Compressor Regulator Valve -N280- is only activated by the A/C control head -E87- when the engine is not running.
- The request to activate the coolant fans (step 1 and 2) is always transmitted by the A/C control head -E87- to the Engine Control Module (ECM). The engine control module switches the coolant fans on, but only with the engine running.
See MULTIPORT FUEL INJECTION (MFI), GENERIC SCAN TOOL - 3.0L AVK .
See MULTIPORT FUEL INJECTION (MFI) -1.8L 5V TURBO, AMB
- The output Diagnostic Test Mode can only be carried out up to an engine speed of 3000 RPM and a vehicle speed less than 5 km/h.
- Component location of activated components, see A/C SYSTEM CONTROL AND REGULATION COMPONENTS .
- The Output Diagnostic Test Mode (DTM) can be carried out more than once if necessary.
- Malfunctions on the actuators are stored in the DTC memory.
- The control and the display of the A/C control head -E87- is switched off during the output Diagnostic Test Mode. The segments of the A/C control head -E87- are only activated during the "Segment test" function.
- After selecting the "output Diagnostic Test Mode" function, the positioning motors of the climate control system are being moved into a pre-assigned position. During the output Diagnostic Test Mode, it is not necessary to wait until the positioning motors reach the pre-assigned position.
- For vehicles with 8 cyl. engine the compressor is driven by a shaft, rather than a belt. See VEHICLES WITH 8 CYL. ENGINE (COMPRESSOR DRIVE VIA A SHAFT) .
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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.