Navistar International DT 466 Diagnostic/Troubleshooting Manual page 406

402 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Harness Resistance Checks (Turn the ignition switch to OFF. Disconnect fan. Remove relay and connect
relay breakout harness. Connect breakout box X4 to chassis wiring harness only.)
X4–14 to 85
87A to A (fan)
30 to Fuse
86 to Fuse
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
< 5 Ω
< 5 Ω
< 5 Ω
< 5 Ω
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
If > 5 Ω, check for harness open between ECM and
relay terminal.
If > 5 Ω, check for harness open between relay terminal
and A (fan).
If > 5 Ω, check for harness open between fuse and relay
terminal. See truck Chassis Electrical Circuit Diagram
Manual for fuse information.
If > 5 Ω, check for harness open between fuse and relay
terminal. See truck Chassis Electrical Circuit Diagram
Manual for fuse information.