Glow Plug System - TDV6 3.0L Diesel (G2006281): Operation: Diagnostic

WARNING: This page is about a different variant/trim than selected.

The glow plug control module monitors the drive circuit of the glow plugs for plausibility of operation, continuity, short and open circuits. If the glow plug control module detects a fault a signal is sent to the Powertrain Control Module (PCM), which stores a Diagnostic Trouble Code (DTC).

The PCM contains functionality to protect the glow plugs from exceeding their operating temperature. The glow plug control module has an energy manager function to prevent overheating the glow plugs due to repeated cold engine cranking attempts. The energy manager is closed loop controlled and monitors the resistance of the glow plugs. The resistance changes with temperature. The energy manager determines the glow plug temperature. It only supplies the necessary Pulse Width Modulation (PWM) voltage necessary to restore the glow plug to the required temperature. To further protect the glow plugs, after three attempts of preheat in one ignition cycle, the glow plug heating is suspended. After ignition off (power mode 4) and a period of approximately 45 seconds has elapsed, the glow plug heating is restored.