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Home >> Audi >> 2014 >> A7 Quattro TDI Premium Plus >> Repair and Diagnosis >> Engine Performance >> System >> 3.0L - Generic Scan Tool - Engine Code: CPNB (2 Of 2) >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Automatic Glow Time Control Module -J179- AND GLOW PLUG, CHECKING >> Function

Automatic Glow Time Control Module -J179- AND GLOW PLUG, CHECKING: Function

The glow plugs are activated by the Engine Control Module -J623- over the Automatic Glow Time Control Module -J179-. The voltage on the individual glow plugs is adjusted over the frequency of the PWM impulses. For quick start with an ambient temperature of less than 64°F (18°C), a maximum voltage of 11.5 volts is present during preheating. This ensures that the glow plug heats up as quickly as possible (maximum two seconds) to over 1832°F (1000°C), thus reducing the preheating time of the engine. Post-heating is performed up to a coolant temperature of 64°F (18°C) after the engine start for a maximum of five minutes. Post-heating helps reduce hydrocarbon emissions and combustion noise during the engine warm-up phase.

Special tools and workshop equipment required 

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