Navistar International DT 466 Diagnostic/Troubleshooting Manual page 381

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Check with breakout
box connected [X1 and X2] to engine harness only. Disconnect chassis connector 9260
bent pins or corrosion.)
X1–19 to Pin A (9260)
X1–24 to Pin A (9260)
X2–6 to Pin A (9260)
X2–13 to Pin A (9260)
X2–12 to Pin A (9260)
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 Chassis Ground (Turn the ignition switch to OFF. Check with breakout box
connected [X1 and X2] to engine harness only. Disconnect chassis connector 9260
battery cable. Use disconnected negative battery cable for ground test point.)
X1–19 to gnd cable
X1–24 to gnd cable
X2–6 to gnd cable
X2–13 to gnd cable
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
> 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.
> 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.
> 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.
> 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.
< 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.
> 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.
> 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.
> 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.
> 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.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
377
1
. Inspect for
1
. Disconnect negative