7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 485
Harness Resistance Checks – Main Power Relay to Battery (Turn the ignition switch
to OFF. Disconnect
negative battery cable. Disconnect harness from sensor. Inspect for bent pins
or corrosion. Connect
relay breakout harness.)
30 (IDM relay) to
B+ cable
<5Ω If > 5 Ω, check connections for open between relay and positive battery
cable. Check fuses. See truck Chassis Electrical Circuit Diagram
Manual for relay and fuse locations.
86 (IDM relay) to
B+ cable
<5Ω If > 5 Ω, check connections for open between relay and positive battery
cable. Check fuse. See truck Chassis Electrical Circuit Diagram Manual
for relay and fuse locations.
CAUTION: To avoid engine damage, turn the ignition switc
h to OFF before disconnecting the connector relay
for the IDM. Failure to tur n the ignition switch to OFF wi
ll cause a voltage spike and damage to electrical
components.
Harness Resistance Checks – IDM to Main Power Relay (Tur
n the ignition switch to OFF. Inspect for bent
pins or corrosion. Connect relay breakout harne
ss and use Terminal Test Adap ter Kit to test.)
IDMX3–4to87
<5Ω If > 5 Ω, check connection from IDM to relay. See truck Chassis
Electrical Circuit Diagram Manual for c ircuit numbers, connector
and fuse locations.
IDM X3–23 to 87
<5Ω If > 5 Ω, check connection from IDM to relay. See truck Chassis
Electrical Circuit Diagram Manual for c ircuit numbers, connector
and fuse locations.
IDM X3–24 to 87
<5Ω If > 5 Ω, check connection from IDM to re
lay. See truck Chassis
Electrical Circuit Diagram Manual fo
r circuit numbers, connector
and fuse locations.
IDM X3–25 to 87
<5Ω If > 5 Ω, check connection from IDM to relay. See truck Chassis
Electrical Circuit Diagram Manual for c ircuit numbers, connector
and fuse locations.
IDMX3–8to87
<5Ω If > 5 Ω, check connection from IDM through fuse to relay.
IDM X3–27 to 85
<5Ω If > 5 Ω, check connection from
IDM to rela y.
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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