Table of Contents
Advertisement
186
14. Low ICP System Pressure
Figure 222
Purpose
To determine the cause of low injection control
pressure that prevents engine starting
Tools
•
EST with MasterDiagnostics® software
•
EZ-Tech® interface cable
•
Digital Multimeter (DMM)
•
Actuator Breakout Harness
•
Jumper harness (from Terminal Test Kit)
•
Pressure Sensor Breakout Harness
•
Socket or wrench (EOT sensor)
•
Compressed air source 689 kPa (100 psi)
•
Spare VT 365 ICP sensor (Part No. -1845274C92
or equivalent)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
5 HARD START AND NO START DIAGNOSTICS
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
•
Spare high-pressure hose (Part No.-1842571C91
or equivalent)
NOTE: The mechanic is expected to keep the
spare ICP sensor and high-pressure hose for future
diagnostics.
Expense the spare ICP sensor and
high-pressure hose as essential tools and keep it with
other diagnostic tools. Warranty will not cover the
cost of the spare ICP sensor and high-pressure hose.
Possible Causes
•
ICP system leakage
•
Failed ICP sensor circuit
•
Failed ICP sensor
•
Failed IPR wiring (power and control)
•
Failed IPR valve
•
Low or no lube oil pressure
•
Inoperative high-pressure oil pump
•
Failed BCP sensor circuit
•
Failed BCP sensor
•
Inoperative brake shut-off valve of Diamond
Logic® engine brake
•
BCP system leakage
•
If ECM detects low boost pressure, an incorrect
feedback signal from APS or the ICP sensor, the
ECM commands the IPR valve to reduce ICP.
14.1 – System Function
Start Test 14.1 System Function – continue Low ICP
System Pressure diagnostics, if no concerns are
found with the following:
•
Lube oil pressure system has the ability to build
engine oil pressure while the engine is cranking.
•
Inspect
Injection
valve and engine wiring harness connector for
corrosion.
EGES-270-1
Pressure
regulator
(IPR)
Advertisement
Chapters
Table of Contents
