214 6 PERFORMANCE DIAGNOSTICS
• OCC fault for the IPR valve or brake shut-off valve
(if equipped)
• Inlet Air Heater (IAH)
— For initial calibrations, if the system voltage
is less than 13 volts, DTC 251 may become
active.
— Later calibrations and current hardware levels
do not support DTC 251.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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