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E L E C T R I C A L C O M P O N E N T S
Glow Plug System Diagnostics
• One way to verify diagnostic data from the
GPCM is to measure the amperage draw
with an inductive amp probe.
• Once the glow plug system has been
commanded on by the PCM (when engine
temperature is warm you may need to trick
the system into a cold condition) for about
40 sec., the glow plug amperage should be
stable. Each glow plug should draw between
10-12 amps.
• When testing the glow plug system, it is best
to measure one bank of glow plugs at a
time. The bank with the lower current draw
would be the bank with the bad glow plug
and/or wiring concerns.
68
INDUCTIVE
AMP METER
GLOW PLUG
WIRING
130
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