Navistar International DT 466 Diagnostic/Troubleshooting Manual page 384

380 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
IDM CAN 2 Checks (Remove ECM following procedure in the Engine Service Manual. Measure directly to
ECM pins only.)
NOTE: Use IDM ground pins (X3–1, X3–2, X3–3, X3–22, or X3–26) only for this test.
IDM X3–30 to gnd
IDM X3–31 to gnd
IDM X3–30 to X3–31
IDM X3–32 to gnd
IDM housing to gnd
1
Connector 9260 is a 2-wire connector usually located in the battery box. Pin A is the chassis ground connection for
the ECM and IDM. Refer to truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM
ground circuit information.
Operational Checks for CMPO and CKPO (Check with breakout box connected to ECM and engine
harness.)
Test Point
X1–24 to X1–6
X1–19 to X1–6
Diagnostic Trouble Codes
DTC 543 = ECM / IDM communication fault
DTC 551 = IDM CMPO signal inactive
DTC 552 = IDM incorrect CMPO signal signature
DTC 553 = IDM CKPO signal inactive
DTC 554 = IDM incorrect CKPO signal signature
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
1.85 MΩ If > spec, replace the IDM.
±0.20 MΩ
1.85 MΩ If > spec, replace the IDM.
±0.20 MΩ
120 Ω If > 120 Ω, replace the IDM.
< 5 Ω If > 5 Ω, replace the IDM.
< 5 Ω If > 5 Ω, replace the IDM.
Engine Cranking Low Idle
130–225 rpm @ 700 rpm
2
130–225 rpm rpm
130–225 Hz @ 700 Hz @ 700
130–225 rpm rpm
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
High Idle
@ 700 2750 rpm @ 2750
2 2
rpm
2.75 kHZ to 3.00
kHz
Comment
Set DMM to
DC-rpm
2
Set DMM to DC-Hz