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238
•
If ICP is still high or unstable, replace IPR
following procedures in Engine Service
Manual and retest.
Possible Causes
•
Low injection control pressure
•
Injection control pressure system leakage
•
Failed IPR wiring (power and control)
•
Failed IPR valve
•
Failed injector
•
Cracked or porous high-pressure rail
•
Injector oil inlet adapter O-rings
•
Injector oil inlet adapter
•
O-ring for high-pressure oil rail
•
End plugs in high-pressure oil rail
•
Low oil pressure
•
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.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
•
•
•
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
High injection control pressure
•
Aerated lube oil
•
Bias high ICP sensor – low duty cycle
Erratic injection control pressure
•
ICP sensor
•
IPR wiring
•
IPR valve
•
Middle seal IPR valve
Brake control pressure
•
Failed BCP sensor circuit
•
Failed BCP sensor
•
Inoperative brake shut-off valve of Diamond
Logic® engine brake
•
Brake control pressure system leakage
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