Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A municipal snowplow operating in Ontario uses an engine-block heater and a glow plug system. During pre-trip inspection on a -20°C morning, the operator notices the glow plug indicator light comes on for less than 2 seconds, and the engine struggles to start. The block heater was plugged in and functioning. What is the most probable fault affecting the glow plug system?
A very short duration for the glow plug indicator light, especially in extremely cold weather, strongly suggests a fault with the glow plug controller or timer
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Question: A municipal snowplow operating in Ontario uses an engine-block heater and a glow plug system. During pre-trip inspection on a -20°C morning, the operator notices the glow plug indicator light comes on for less than 2 seconds, and the engine struggles to start. The block heater was plugged in and functioning. What is the most probable fault affecting the glow plug system?
Answer options: ✅ A malfunctioning glow plug controller/timer module.
- A shorted individual glow plug causing a rapid system shutdown.
- A low engine oil pressure sensor reading, inhibiting heating.
- A high resistance in the battery ground cable.
Correct answer: A malfunctioning glow plug controller/timer module.
Explanation: A very short duration for the glow plug indicator light, especially in extremely cold weather, strongly suggests a fault with the glow plug controller or timer module (which dictates the 'on' time based on temperature) rather than the individual plugs themselves, affecting the entire system's ability to preheat.
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