NPR L4-5.2L DSL Turbo (2005)
Glow Plug System: Testing and Inspection
Glow Control System Check
Description
The glow control system consists of the engine control module (ECM), the glow relay, glow plugs and the glow indicator lamp. The glow control system
is operated when the engine coolant temperature is low, which allows easier engine starting. If the ignition switch is turned ON when the engine coolant
temperature is low, the ECM turns ON the glow relay and illuminates the glow indicator lamp. After a fixed time passes, the ECM turns OFF the glow
relay and the glow indicator lamp.
Glow Control Operation
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The glow control system operates when the engine coolant temperature is less than 50 °F (10 °C).
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The glow indicator lamp is illuminated between 3 seconds and 10 seconds according to the engine coolant temperature.
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The glow relay is ON between 15 seconds and 30 seconds according to the engine coolant temperature.
Schematic Reference: Engine Controls Schematics
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