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Home >> Audi >> 2014 >> A5 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 621 (3.0L - Generic Scan Tool - Engine Code(S): CCBA, CGXC & CTUB (General Information - Diagnostic Modes) (Sedan)) >> St Generic Scan Tool >> General Information >> Malfunction Indicator Lamp Illumination

Malfunction Indicator Lamp Illumination

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If the engine control module (ECM) recognizes a malfunction that leads to increased emission values, it indicates them by illuminating the malfunction indicator lamp (MIL) which is located in the instrument cluster.

The ECM switches on the MIL after the ignition is switched on. Shortly after the engine is started, the MIL goes out if the ECM does not detect a malfunction that increases the emission values.

If the ECM recognizes a malfunction that leads to increased emissions during the operation of the engine, the ECM switches on the MIL and an entry is stored in the DTC memory of the ECM.

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