Navistar International DT 466 Diagnostic/Troubleshooting Manual page 383

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Harness Resistance Checks (Turn the ignition switch to OFF. Check with breakout box connected [X1 and
X2] to engine harness only. IDM checked at harness connector X3 using terminal test pins. IDM pins are
numbered on the mating end of the connector.)
NOTE: Test points are from ECM to IDM.
ECM X1–19 to IDM X3–5
ECM X1–24 to IDM X3–10
ECM X2–6 to IDM X3–30
ECM X2–13 to IDM X3–31
ECM X2–12 to IDM X3–32
Resistance Checks – CAN 2 Datalink (Turn the ignition switch to OFF. Connect breakout box to ECM
and chassis harness.)
ECM X2–6 to gnd
ECM X2–13 to gnd
ECM X2–6 to X2–13
ECM X2–12 to gnd
Resistance Checks – ECM CAN 2 Circuit (Remove ECM following procedure in the Engine Service
Manual. Measure directly to ECM pins only.)
NOTE: Use ECM ground pins (X3–7 or X3–6) only for this test.
ECM X2–6 to gnd
ECM X2–13 to gnd
ECM X2–6 to X2–13
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
< 5 Ω If > 5 Ω, check for open in harness.
< 5 Ω If > 5 Ω, check for open in harness.
< 5 Ω If > 5 Ω, check for open in harness.
< 5 Ω If > 5 Ω, check for open in harness.
< 5 Ω If > 5 Ω, check for open in harness.
3 MΩ ±0.1 If > spec, check for short to ground or another circuit. Check
MΩ ECM and IDM separately.
If < spec, check for open circuit on CAN 2+. Check ECM
and IDM separately.
3 MΩ ±0.1 If > spec, check for short to ground or another circuit. Check
MΩ ECM and IDM separately.
If < spec, check for open circuit on CAN 2+. Check ECM
and IDM separately.
60 Ω If > 60 Ω, check for open circuit on CAN 2+ and CAN 2-.
Check ECM and IDM separately. Do Resistance Checks –
ECM CAN 2 Circuit and Resistance Checks – IDM CAN 2.
< 5 Ω If > 5, check for open on CAN 2 shield (IDM Pin X3–32).
Check ECM and IDM separately. Do Resistance Checks –
ECM CAN 2 Circuit and Resistance Checks – IDM CAN 2.
3.9 MΩ ±0.2 If > spec, replace the ECM.
MΩ
3.9 MΩ ±0.2 If > spec, replace the ECM.
MΩ
120 Ω If > spec, replace the ECM.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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