540 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
The system ha s two V
REF
circuits:
•V
REF
A for engine sensors
•V
REF
B for chassis sensors
NOTE: See truck Chassis Electrical Circuit Diagram
Manual for APS and BAP sensor circuit diagrams.
V
REF
Circuit Operation
Figure 506 V
REF
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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