7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 553
Harness Resistance Check – WIF Connector to ECM (Turn the ignition switch to OFF. C
onnect breakout
box to chassis harness only. Disconnect sensor.)
X1–14toB
<5Ω If > 5 Ω, check for open V
REF
circuit.
X2–9 to A
<5Ω If > 5 Ω, check for open signal wire.
Operational Voltage Checks for WIF Sensor (Check with breakout bo
x connected to ECM and engine
harness and WIF sensor connected. Turn the ignition switch to ON.
)
X2–9 to gnd 0 V to 2.5 V
Voltage is 2.5 V with water in fuel. Voltage 0 V without water in fuel
(use breakout box).
WIF Diagnostic Trouble C odes
DTC 153 = Signal voltage was > 4.5 V
1
Connector 9260 is a 2-wire connector usually located
in the battery box. Pin A is the chassis ground connection for
the ECM and IDM. Refer to truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM
ground c ircuit information.
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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