Navistar International DT 466 Diagnostic/Troubleshooting Manual page 556

552 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
WIF Pin-Point Diagnostics
Figure 513 WIF system circuit diagram
The WIF circuit may require the use of vehicle
circuit diagrams. See truck Chassis Electrical Circuit
Diagram Manual for circuit numbers, connector and
fuse locations.
Voltage Checks at WIF Sensor Connector (Disconnect harness from sensor and turn the ignition switch to
ON.) Note: After removing connector, inspect for damaged pins, corrosion, or loose pins. Repair as required.
Test Point Spec
A to gnd 5 V ±0.5 V
B to gnd 0 V
Sensor Resistance Check (Disconnect connector from sensor and measure across sensor.)
A to B > 1 kΩ
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
chassis connector 9260
A to Pin B (9260) > 1 kΩ
B to Pin B (9260) > 1 kΩ
WARNING: To avoid serious personal injury, possible death, or damage to the engine or vehicle,
always disconnect main negative battery cable first. Always connect the main negative battery cable
last.
Connector Resistance Checks to Chassis Ground (Turn the ignition switch to OFF. Disconnect chassis
1
connector 9260 . Disconnect negative battery cable. Disconnect harness from sensor. Use disconnected
negative battery cable for ground test point.)
A to gnd cable > 1 kΩ
B to gnd cable > 1 kΩ
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Comment
If voltage < 5 V, check for open V
If voltage > 0 V, check for signal circuit shorted to another circuit
If < 1 kΩ, check for water in fuel, failed sensor, or shorted sensor
harness.
1
. Disconnect harness from sensor.)
If < 1 kΩ, check for short to signal ground.
If < 1 kΩ, check for short to signal ground.
If < 1 kΩ, check for short to chassis ground.
If < 1 kΩ, check for short to chassis ground.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
EGES-270-1
circuit or failed ECM.
REF