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Boost Possible Causes
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Intake leaks (hoses, clamps)
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Boost leaks
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Restricted intake or exhaust
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Exhaust leaks
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Low fuel pressure
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Low ICP
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Control system faults
Injection Control Pressure Possible Causes
Low injection control pressure
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Injection control pressure system leakage
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Failed IPR wiring (power and control)
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Failed IPR valve
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Failed injector
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Cracked or porous high-pressure rail
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Injector oil inlet adapter O-rings
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Injector oil inlet adapter
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O-ring for high-pressure oil rail
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End plugs in high-pressure oil rail
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Low oil pressure
High injection control pressure
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Aerated lube oil
Erratic injection control pressure
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ICP sensor
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IPR wiring
Brake control pressure
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Failed BCP sensor circuit
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Failed BCP sensor
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
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EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Failed EGR control valve
Failed EGR control valve
Inoperative fuel injectors
Failed turbocharger
Diamond Logic® engine brake malfunction
Biased BAP, EBP, ICP or MAP sensors
Power cylinder condition
Inoperative high-pressure oil pump
Failed ICP sensor circuit
Failed ICP sensor
Inoperative brake shut-off valve of Diamond
Logic® engine brake
Brake pressure relief valve (optional)
If relief valve is leaking, the brake shut-off valve
is suspect.
If ECM detect low boost pressure, an incorrect
feedback signal from APS or the ICP sensor,
the ECM commands the IPR valve to reduce
injection control pressure.
Bias high ICP sensor – low duty cycle
IPR valve
Middle seal IPR valve
Inoperative brake shut-off valve of Diamond
Logic® engine brake
Brake control pressure system leakage
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