516 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
RSE Diagnostic Trouble Codes (DTCs)
DTC 256
RSE OCC fault
• DTC256issetbytheECMwhentheOCCtest
has failed after the KOEO Standard Test has been
run.
• DTC 256 can be set when a poor connection, an
open or short to ground in the relay control circuit,
or failed relay exists.
• When DTC 256 is active the amber ENGINE lamp
is illuminated.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
RSE Pin-Point Diagnostics
Figure 494 RSE circuit diagram
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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