Measure Crankcase Pressure; Icp System Checks - International VT 275 V6 Manual

DIAGNOSTIC TESTS

ICP System Checks

• The Injection Control Pressure system must
be able to build a minimum of 500 psi
during cranking for the engine to start. The
possible causes of low ICP during
cranking are:
-Faulty ICP sensor
-Low oil level in the reservoir
-Faulty IPR circuit
-ECM not controlling the IPR
-Inoperative IPR
-Leak in the high-pressure system
-Inoperative pump
• If the ICP is low while cranking, verify the
engine has met the minimum cranking lube
oil pressure of 20 psi. Lube oil system
pressure is required to maintain the
correct level in the reservoir.
• Inspect the IPR connector for corrosion.
Perform the KOEO Standard test. The
standard test will verify the IPR circuit. If
the circuit has a fault, a 241 DTC
will be set.
96

Measure Crankcase Pressure

• Crankcase pressure can be used to
evaluate the condition of the power
cylinders. Remove the oil fill cap and
thread the extended Oil Fill Tube (part
number 180971C91) into the valve cover
fill cap opening. Thread the Crankcase
Pressure Test Adapter (ZTSE4510) into
the fill adapter.
• Block off the crankcase breather. By
blocking the breather, all of the crankcase
gasses are forced through the Crankcase
Pressure Test Adapter.
• Connect the magnehelic gauge to the
Crankcase Pressure Test Adapter. Run the
engine
temperature (158°F or higher).
• Run the engine at high idle. Allow the
reading to stabilize before taking the
reading. Compare the reading with the
performance specifications. Use the
Injector Disable test and the Relative
Compression test to further evaluate
high readings.
Oil rail
From low-pressure
oil system
Oil reservoir
screen
High-
pressure
pump
IPR valve
Oil drain to sump
International ® VT 275 V6 Engine
to reach normal
Fuel injectors
Check valve
Check valve
with orifice
with orifice
operating
Oil rail
ICP
sensor