7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 475
DTC 333 – ICP above/below desired level
DTC 333 indicates an injection control system response time fault and may be set during normal engine
operation through the continuous monitor function or during the KOER Standard Test.
DTC 333 is set by the ECM when the measured pressure does not match the pressure expected by the
ECM. DTC 333 will be set if the measured value is less than or greater than 3 MPa (435 psi) of desired
injection c ontrol pressure for a period greater than 7 seconds.
When DTC 333 is active, the ECM will ignore feedback from the ICP sensor and control the IPR valve from
programm ed d efault values. The am b e r E N GINE lamp will be illumina ted when DTC 33 3 is active .
Possible causes for DTC 333 include the following:
• Low oil level in crankcase
• High oil level in crankcase
• Contaminated engine oil
• Debris in engine oil
• Aerated engine oil
• Trapped air in the ICP system (particularly after an injector or high-pressure pump replacement)
• 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.
• Inoperative or stuck injection pressure regulator
• Leaks in ICP system
• Leaks in Brake Control Pressure (BCP) system or failed brake shut-off valve
• Problem with ICP sensor or sensor circuit, incorrect sensor, system biased high or low
• Inoperative high-pressure hydraulic pump
Checks and Tests Comment
Check repair history – Determine if
trapped air caused by ICP system
disassembly.
If ICP system was serviced, vehicle should be operated 20 miles
to validate system performance
Check oil level an d quality. Check oil level, API classification. Inspect for debris. If
contamination is suspected, check oil filter element.
Check active and inactive DTCs. Repair any ICP sensor codes. See “ICP Sens
or” (page 457).
Do ICP Operational Voltage Checks. Check KOEO pressure sensor values and voltage. See “ICP
Sensor” (page 457).
Do IPR Pin-Point Diagnostics.
See“IPR”(page494).
Do K O EO Standard Test. Test will verify IPR c ircuit contin
uity. See “Performance
Diagnostics” – Section 6 (page 205).
Do KOER Standard Test. Test will verify major ICP system failure. See “Performance
Diagnostics” – Section 6 (page 205).
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.
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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