Question
How to diagnose faulty diesel engine glow plug relay?
Answer
Test relay coil resistance and monitor voltage output to glow plugs.
Explain
A faulty glow plug relay prevents cold-start functionality. CHEPQ multimeters test relay coil resistance (5-10Ω) and voltage output (12V during cold start), identifying open coils or contact failures—replacing the relay ensures reliable glow plug activation in low temperatures.
Related Diagnostic Guide
To explore this topic in a broader system-level diagnostic context:
Related Guide: OBD-II, DTC & Live Data Analysis
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