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

The glow plugs are activated by the Engine Control Module -J623- through the Automatic Glow Time Control Module -J179-. The voltage on the individual glow plugs is adjusted over the frequency of the PWM impulses. For a quick start in 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 of two seconds) to over 1, 832° F (1, 000° 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 

• Multimeter
• Wiring Diagram
• Scan Tool