Glow Plug Control Module
The glow plug control module receives fused power directly from the batteries. The ECM communicates with the glow plug control module over the CAN. The glow plugs are grounded through the cylinder head. The ECM calculates an average temperature based on inputs from the engine coolant temperature sensor, the air intake manifold temperature sensor, and an internal temperature sensor in the glow plug control module. After the required conditions are met, the glow plug control module sends an output to each of the eight glow plugs individually. The glow plug control module monitors the operation of individual glow plugs and reports malfunctions back to the ECM. The glow plugs begin activating with the ignition switch on during the wait-to-start sequence and will continue to operate after cranking if the ECM determines the glow plugs are needed.