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7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
The ECM supplies V
connector) and at X4–4 (chassis connector) when the
ignition switch is on.
Fault Detection / Management
There are no DTCs for V
occurs in a sensor, the ECM may set an out of range
high or low code. Multiple high or low codes are
indicators of a V
or signal ground fault condition.
REF
When a V
signal is shorted to ground, shorted
REF
to ground occurs, the ECM will reset and cause a
stumble.
When the ECM sets multiple sensor DTCs, the V
circuit is open or shorted, or the signal ground circuit
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
at Pin X1–14 (engine
REF
. When a V
circuit fault
REF
REF
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
is open. To determine if the V
complete the pin-point diagnostics check.
Tools
•
EST with MasterDiagnostics® software
•
EZ-Tech® interface cable
•
Digital Multimeter (DMM)
•
Breakout Harness
•
Breakout Box
•
Terminal Test Adapter Kit
NOTE: After removing connector,
REF
damaged pins, corrosion, or loose pins.
as required.
EGES-270-1
541
circuits are the cause,
REF
inspect for
Repair
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