7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 487
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
chassis connector 9260
1
Disconnect negative battery cable. Disconnect harness from sensor. Use
disconnected negative battery cable for ground test point.)
Test Point
Spec Comment
IDM X3–1 to gnd cable
<5Ω If > 5 Ω, check connection to battery ground. See truckChassis
Electrical Circuit Diagram Manual for c ircuit numbers, connector
and fuse locations.
IDM X3–2 to gnd cable
<5Ω If > 5 Ω, check connection to battery ground. See truckChassis
Electrical Circuit Diagram Manual for c ircuit numbers, connector
and fuse locations.
IDM X3–3 to gnd cable
<5Ω If > 5 Ω, check connection to battery ground. See
truckChassis
Electrical Circuit Diagram Manual for circui
t numbers, connector
and fuse locations.
IDM X3–22 to gnd cable
<5Ω If > 5 Ω, check connection to battery ground. See truckChassis
Electrical Circuit Diagram Manual for c ircuit numbers, connector
and fuse locations.
IDM X3–26 to gnd cable
<5Ω If > 5 Ω, check connection to battery ground. See truck Chassis
Electrical Circuit Diagram Manual for c ircuit numbers, connector
and fuse locations.
IDM X3–4 to gnd cable
> 900 Ω If < 900 Ω, check for s hort to ground.
IDM X3–23 to gnd cable
> 900 Ω If < 900 Ω, check for s hort to ground.
IDM X3–24 to gnd cable
> 900 Ω If < 900 Ω, check for s hort to ground.
IDM X3–25 to gnd cable
> 900 Ω If < 900 Ω, check for short to gr
ound.
IDM X3–8 to gnd cable
> 900 Ω If < 900 Ω, check for s hort to ground.
IDM X3–27 to gnd cable
> 900 Ω If < 900 Ω, check for s hort to ground.
IDM X3–7 to gnd cable
> 900 Ω If < 900 Ω,checkforshort
to ground.
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
IGN
- power
relay)
<5Ω If > 5 Ω,seetruckChassis Electrical Circuit Diagram Manual for
circuit numbers, connector and fuse locations. Check connections
in circuit.
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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