Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Glow Plug System

The glow plug system provides the heat needed to begin combustion when starting the engine at cold ambient temperatures.

The glow plug relay switches voltage to the glow plugs and is commanded ON and OFF by the PCM. The glow plugs are heated before and during cranking, as well as during the initial engine operation. The PCM monitors glow plug relay output voltage in order to determine if the relay is following the PCM commands.