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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (6.7L Diesel - DTCS - P040D To P1191 - 3500 Cab & Chassis) >> Diagnosis and Testing >> P064C-Glow Plug Module Internal Performance >> Code Description >> Theory of Operation

Theory of Operation

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The glow plugs provide a hot spot in the combustion chamber, and are used to aid in cold starting. The Glow Plug Control Module (GPCM) controls the glow plug temperature by regulating the current supplied to the glow plugs. The GPCM communicates with the ECM via the J1939 engine datalink, and the glow plug temperature and operation time is based on engine information supplied by the ECM. The GPCM monitors the status of each glow plug individually, and reports diagnostic failures to the ECM via the J1939 datalink. The glow plug system will be disabled when the fault is set. The ECM will turn OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and passes.

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