7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 377
Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Check wi
th breakout
box connected [X1 and X2] to engine harness only. Disconnect chassis connector
9260
1
. Ins pect for
bent pins or corrosion.)
X1–19 to Pin A (9260) > 1 kΩ If < 1 kΩ, check for short to ground or internal IDM problem.
Test with IDM connector X3 disconnected. If problem
remains, repair or replace harness. If disconnect of X3
corrected problem, replace IDM.
X1–24 to Pin A (9260) > 1 kΩ If < 1 kΩ, check for short to ground or internal IDM problem.
Test with IDM connector X3 disconnected. If problem
remains, repair or replace harness. If disconnect of X3
corrected problem, replace IDM.
X2–6 to Pin A (9260) > 1 kΩ If < 1 kΩ, check for short to ground or internal IDM pro
blem.
Test with IDM connector X3 disconnected. If proble
m
remains, repair or replace harness. If disconnec
tofX3
corrected problem, replace IDM.
X2–13 to Pin A (9260) > 1 kΩ If < 1 kΩ, check for short to ground or internal IDM problem.
Test with IDM connector X3 disconnected. If problem
remains, repair or replace harness. If disconnect of X3
corrected problem, replace IDM.
X2–12 to Pin A (9260) < 10 Ω If > 10 Ω, check for open in harness. CAN 2 shield is
grounded through IDM. If X3 is not connected to IDM, spec
will be > 500 Ω.
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.
Resistance Checks to Chassi
s Ground (Turn the ignition switch to OFF. Check with breakout box
connected [X1 and X2] to engi
ne harness only. Disconnect chassis connector 9260
1
. D isconnect negative
battery cable. Use disconn
ected negative battery cable for ground test point.)
X1–19 to gnd cable
>1kΩ If < 1 kΩ, check for short to ground or internal IDM problem.
Test with IDM connector X3 disconnected. If problem
remains, repair or replace harness. If disconnect of X3
corrected problem, replace IDM.
X1–24 to gnd cable
>1kΩ If < 1 kΩ, check for short to ground or internal IDM problem.
Test with IDM connector X3 disconnected. If problem
remains, repair or replace harness. If disconnect of X3
corrected problem, replace IDM.
X2–6 to gnd cable
>1kΩ If < 1 kΩ,checkfor
short to ground or internal IDM problem.
Test with IDM con
nector X3 disconnected. If problem
remains, repai
r or replace harness. If disconnect of X3
corrected prob
lem, replace IDM.
X2–13 to gnd cable
>1kΩ If < 1 kΩ, check for short to ground or internal IDM problem.
Test with IDM connector X3 disconnected. If problem
remains, repair or replace harness. If disconnect of X3
corrected problem, replace IDM.
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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