Navistar International DT 466 Diagnostic/Troubleshooting Manual page 409

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
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 negative
battery cable. Disconnect harness from sensor. Use disconnected negative battery cable for ground test
point.)
A to gnd cable
B to gnd cable
Harness Resistance Checks (Turn the ignition switch to OFF. Disconnect solenoid. Connect breakout
box X4 to chassis wiring harness only.)
X4–14 to B
A to Fuse
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
> 1 kΩ
> 1 kΩ
< 5 Ω
< 5 Ω
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
If < 1 kΩ, check for short to ground.
If < 1 kΩ, check for short to ground.
If > 5 Ω, check for harness open between ECM and fan
solenoid.
If > 5 Ω, check for harness open between fuse and fan
solenoid. See truck Chassis Electrical Circuit Diagram
Manual for fuse information.
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