The glow plug system assists in providing the heat required to begin combustion during engine starting at cold ambient temperatures. The glow plugs are heated before and during cranking, as well as during initial engine operation.
There are three components of the glow plug system: a relay, an instrument panel-mounted lamp, and the glow plugs.
The PCM uses input information about engine coolant temperature and engine speed, as well as feedback information from the glow plug circuit, to control glow plug relay and lamp operation (figure 5-41).
