Navistar International DT 466 Diagnostic/Troubleshooting Manual page 489

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
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 < 5 Ω
B+ cable
86 (IDM relay) to < 5 Ω
B+ cable
CAUTION: To avoid engine damage, turn the ignition switch to OFF before disconnecting the connector relay
for the IDM. Failure to turn the ignition switch to OFF will cause a voltage spike and damage to electrical
components.
Harness Resistance Checks – IDM to Main Power Relay (Turn the ignition switch to OFF. Inspect for bent
pins or corrosion. Connect relay breakout harness and use Terminal Test Adapter Kit to test.)
IDM X3–4 to 87
IDM X3–23 to 87
IDM X3–24 to 87
IDM X3–25 to 87
IDM X3–8 to 87
IDM X3–27 to 85
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
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.
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.
< 5 Ω If > 5 Ω, check connection from IDM to relay. See truck Chassis
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
< 5 Ω If > 5 Ω, check connection from IDM to relay. See truck Chassis
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
If > 5 Ω, check connection from IDM to relay. See truck Chassis
< 5 Ω
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
< 5 Ω If > 5 Ω, check connection from IDM to relay. See truck Chassis
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
< 5 Ω If > 5 Ω, check connection from IDM through fuse to relay.
< 5 Ω If > 5 Ω, check connection from IDM to relay.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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