Navistar International DT 466 Diagnostic/Troubleshooting Manual page 522

518 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Output State Test - Voltage Checks at ECM (Disconnect X3 and X4 from ECM. Connect breakout box
X3 only to ECM and wiring harness. Turn the ignition switch to ON. Run the Output State Tests. For
help, see "Diagnostic Software Operation" in Section 3 (page 68) for procedure to run the Low and High
Output State Tests.)
Output State Test - Low
X3–3 to X3–22
Output State Test - High
X3–3 to X3–22
Operational Voltage Check to Shutter Solenoid (Check with solenoid connected and breakout box
connected. Note: This test should only be done when no DTCs are present. Monitor engine parameters and
voltage at ECM X3–22 while engine is running.)
X3–3 to X3–22
X3–3 to X3–22
RSE Diagnostic Trouble Codes
DTC 256 = Output Circuit Check detected during KOEO Standard Test, indicates high or low resistance in
circuit.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
B+ ± 0.5 V If < B+, verify that ECM is programmed correctly. If ECM
is programmed correctly, replace ECM.
0 V to 0.25 V If > 0.25 V, verify that ECM is programmed correctly. If
ECM is programmed correctly, replace ECM.
B+ ± 0.5 V The solenoid is energized and the shutters are closed.
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0 V to 0.25 V The solenoid is deenergized and the shutters are open.
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EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
MAT is less than 37 °C (99 °F)
IAT is less than 7 °C (45 °F)
ECT is less than 80 °C (176 °F)
No transmission retarder request is present
No engine fan request is present
MAT is greater than 60 °C (140 °F)
IAT is greater than 12 °C (54 °F)
ECT is greater than 87 °C (189 °F)
Transmission retarder request is present
Engine fan request is present