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G E N E R A L D I A G N O S T I C S
ICP Pressure Low During Crank
• If you have no (0 psi) ICP pressure during
crank it could be the result of: major high
pressure oil leak, lack of oil supply to the
high pressure pump, bad high pressure
pump, or the gear on the high pressure
pump is loose. Use PC/ED ICP diagnostics
to determine root cause.
• If ICP during crank is between 200-300 psi
and does not change as IPR duty cycle
increases, the IPR valve may not be
receiving V-power or a ground signal from
the PCM. If V-power and PCM signal are
present then the IPR may be at fault. Use
PC/ED IPR Diagnostics to determine root
cause.
Power or Ground Issues
• When diagnosing a power or ground issue
be aware that there is a 12 way connector
that feeds power and/or ground to the
following components.
• FICM
• IPR
• EGR
• The 12 way connector is located in the rear
left hand corner of the engine compartment.
Injector I/O Test
• There is now a new test incorporated into
the WDS.
• This test allows the technician to disable one
injector at a time and monitor pids to identify
weak injectors.
• While disabling injectors watch the Mfdes
pid. The injector(s) that have the least effect
on Mfdes while being disabled could be the
weak injector.
80
IPR
IPR
12 WAY CONNECTOR
12 WAY CONNECTOR
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