402 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Harness Resistance C h ec ks (Turn the ignition switch to OFF. Disconnect fan. Remo
ve relay and connect
relay breakout harness. Connect breakout box X4 to chassis wiring harness only
.)
X4–14 to 85
<5Ω If > 5 Ω, check for harness open between ECM and
relay terminal.
87A to A (fan) < 5 Ω If > 5 Ω, check for harness open between relay terminal
and A (fan).
30 to Fuse
<5Ω If > 5 Ω, check for harness open between fuse and relay
terminal. See truck Chassis E lectrical Circuit Diagram
Manual for fuse information.
86 to Fuse
<5Ω If > 5 Ω, check for harness open between fuse and relay
terminal. See truck Chassis E lectrical Circuit Diagram
Manual for fuse 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.
To Next Page
Loading...
Need help?
General