Navistar International DT 466 Diagnostic/Troubleshooting Manual page 491

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.
Harness Resistance Checks – IDM to Chassis Ground (Turn the ignition switch to OFF. Disconnect
1
chassis connector 9260
disconnected negative battery cable for ground test point.)
Test Point
IDM X3–1 to gnd cable
IDM X3–2 to gnd cable
IDM X3–3 to gnd cable
IDM X3–22 to gnd cable
IDM X3–26 to gnd cable
IDM X3–4 to gnd cable
IDM X3–23 to gnd cable
IDM X3–24 to gnd cable
IDM X3–25 to gnd cable
IDM X3–8 to gnd cable
IDM X3–27 to gnd cable
IDM X3–7 to gnd cable
Harness Resistance Checks – IDM to Ignition Power Relay (Turn the ignition switch to OFF. Inspect
for bent pins or corrosion. Connect relay breakout harness and breakout box to [X3 and X4] to chassis
harness only.)
X3–7 to 87 (V - power
IGN
relay)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Disconnect negative battery cable. Disconnect harness from sensor. Use
Spec Comment
< 5 Ω If > 5 Ω, check connection to battery ground. See truckChassis
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
< 5 Ω If > 5 Ω, check connection to battery ground. See truckChassis
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
< 5 Ω If > 5 Ω, check connection to battery ground. See truckChassis
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
< 5 Ω If > 5 Ω, check connection to battery ground. See truckChassis
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
< 5 Ω If > 5 Ω, check connection to battery ground. See truck Chassis
Electrical Circuit Diagram Manual for circuit numbers, connector
and fuse locations.
> 900 Ω If < 900 Ω, check for short to ground.
> 900 Ω If < 900 Ω, check for short to ground.
> 900 Ω If < 900 Ω, check for short to ground.
> 900 Ω If < 900 Ω, check for short to ground.
> 900 Ω If < 900 Ω, check for short to ground.
> 900 Ω If < 900 Ω, check for short to ground.
> 900 Ω If < 900 Ω, check for short to ground.
< 5 Ω If > 5 Ω, see truck Chassis Electrical Circuit Diagram Manual for
circuit numbers, connector and fuse locations. Check connections
in circuit.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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