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ElEctrical componEnts
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ECM (Engine Control Module)
• The ECM, which is mounted behind the engine on the
passenger side cowl, uses sensor inputs to control
actuators and send fueling commands to the fuel inectors.
• The ECM controls the fuel and air management
system on the 6.4L Power Stroke
®
Diesel.
Glow Plug System
• The glow plug system is used to warm the
air in the cylinders to enhance cold weather
startability and reduce start up smoke.
• The glow plug system is ECM controlled,
and powered by the GPCM.
Glow Plug Control Module(GPCM)
& Glow Plug Harness
• The GPCM is a unit that controls the glow plugs
in order to warm the air in the cylinders.
• The GPCM uses a glow plug enable signal to turn the
glow plugs on for a time controlled by the ECM.
• The GPCM is capable of diagnosing a problem with one
glow plug and then sending a diagnostic signal to the ECM.
• It also has the ability to turn off one glow plug
if a short is detected in that circuit.
• Each bank of glow plugs is connected to
the engine wiring harness via a glow plug
harness, either left bank or right bank.
• The glow plug harness has four connectors that
supply power to the glow plugs and seal oil from
escaping through the glow plug access holes.
Glow Plug Harness
Chassis Connector
Engine Connector
GPCM
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