Navistar International DT 466 Diagnostic/Troubleshooting Manual page 555

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
WIF Circuit Operation
Figure 512 WIF circuit diagram
The WIF sensor uses two electrical contacts exposed
to the fuel supply. When water is present in the fuel
supply, the circuit between the contacts is closed. This
allows a 5 V signal at ECM Pin X2–9. When water is
not present, the circuit is open and ECM Pin X2–9 will
be 0 V.
Fault Detection / Management
The ECM continuously monitors the WIF circuit for
in-range faults. The ECM does not detect open or
short circuits in the WIF circuit.
detects an in-range fault, DTC 153 will be set.
WIF Diagnostic Trouble Codes (DTCs)
DTCs are read using the Electronic Service Tool (EST)
or by counting the flashes from the amber and red
ENGINE lamp.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
DTC 153
WIF signal out-of-range high
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When the ECM
Tools
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EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
DTC 153 is set when the ECM detects an in-range
voltage at or above 4.5 V at ECM Pin X2–9.
DTC 153 is set when the WIF signal circuit is
shorted to V or V .
REF BAT
When DTC 153 is active, the FUEL FILTER lamp
is not illuminated.
EST with MasterDiagnostics® software
EZ-Tech® interface cable
Digital Multimeter (DMM)
Breakout Box
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