7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 477
Do KOER Continuous Monitor Test
(intermittent DTC detected).
When running test, wiggle wires on ICP sensor, IPR valve, and all
pass through connectors while engine is running.
Do Injection Pressure Control Test. Verify if oil is aerated at high idle. See “Performance Diagnostics”
–Section6(page205).
Test ICP system for leaks. See “Hard Start and No Start Diagnostics” – Section 5 (page 143).
DTC 335 – ICP unable to build pressure during cranking
DTC 335 is set after the ECM detects 8 to 10 seconds of engine cranking with less than 3.5 MPa (508 psi)
of ICP. Engine cranking speed must be greater than 130 rpm before diagnostic trouble code detection
can begin.
Engine cranking time varies with engine temperature.
NOTE: If DTC becomes active during Relative Compression Test, ignore and clear DTC.
Possible causes for DTC 335 include the following:
• Low oil level in crankcase
• No lube oil pressure or lube oil delivery (reservoir empty or not filling)
• Trapped air in the ICP system (particularly after an injector or high-pressure pump replacement)
• Leaks in ICP system
• Leaks in BCP system or failed brake shut-off valv e
• Inoperative or stuck injection pressure regulator
• Intermittent IPR valve wiring connection. Inspect engine wiring harness connector and IPR v alve
terminal for corrosion. Inspect terminal for bent or pushed back pins.
• Loose high-pressure hydraulic pump gear
• Inoperative high-pressure hydraulic pump
Checks and Tests Comment
Visual inspection
Verify ICP sensor and IPR wiring is connected. Check for oil leaks.
Verify if system has been recently serviced (air entrapment). If
ICP system was serviced, vehicle should be operated 20 miles to
validate system performance.
Check oil level and pressure. Inspect engine oil for debris. Verify lube oil pressure and delivery
during engine cranking. Verify delivery by collecting oil from lube
oil pressure tap. See “Hard Start and No Start Diagnostics” –
Section 5 (page 143).
Check active and inactive DTCs. Repair any ICP, CKP, or CMP sensor
codes first. See“ICP
Sensor” (page 457), “CKP Sensor” (p
age 351), and “CMP S en sor”
(page 355) .
Do KOEO Standard Test. Test will verify IPR valve circuit continuity. See “Hard Start and No
Start Diagnostics” – Section 5 (page 143).
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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