518 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Output State Test - Voltage Checks at ECM (Disconnect X3 and X4 from ECM. Connect br
eakout box
X3 only to ECM and wiring harness. Turn the ignition switch to ON. Run the Output S
tate Tests. For
help, see “Diagnostic Software Operation” in Section 3 (page 68) for procedure t
o run the Low and High
Output State Tests.)
Output State Test - Low
X3–3 to X3–22 B+ ± 0.5 V
If < B +, verify that ECM is programmed c orrectly. If ECM
is programmed correctly, replace ECM.
Output State Test - High
X3–3 to X3–22 0 V to 0.25 V
If > 0.25 V, verify that ECM is programmed correctly. If
ECM is programmed correctly, replace ECM.
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. M onitor engine parameters and
voltage at ECM X3–22 while engine is running.)
X3–3 to X3–22 B+ ± 0.5 V The solenoid is energized and the shutters are closed.
• 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 t ransmission retarder request is present
• No engine fan request is present
X3–3 to X3–22 0 V to 0.25 V The solenoid is deenergized and the shutter
s are open.
• 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
RSE Diagnostic Trouble Codes
DTC 256 = Output Circuit Check detected during KOEO Standard Test, indicates high or low resistance in
circuit.
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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