436 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
EOT Diagnostic Trouble Codes (DTCs)
DTCs are read using the EST or by counting the
flashes from the amber and red ENGINE lamp.
DTC 311
EOT signal o ut -of-range low
• DTC 311 is set by the ECM when the EOT signal
is less than 0.2 V for more than 0.35 second.
• DTC 311 can be set due to a sensor signal wire
short to gro un d or a failed EOT sensor.
• When DTC 311 is active the amber ENGINE lamp
is illuminated.
DTC 312
EOT signal out-of-range high
• DTC 312 is set by the ECM when the EOT signal
is greater than 4. 78 V for more than 0.35 se cond.
• DTC 312 can be set due to a signal or ground
circuit open, a short to a voltage source, or a failed
EOT sensor.
• When DTC 312 is active the amber ENGINE lamp
is illuminated.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• 3-Banana Plug Harness
• 500 Ohm Resistor Harness
• Breakout Box
• Breakout Harness
• Terminal Te st Adapter Kit
EOT Operational Diagno
stics
WARNING: To avoid serious personal injury,
possible death, or damage to the engine or vehicle
– comply with the following:
Be careful to avoid rotatin g parts (belts an d fan)
and hot engine surfaces.
1. Using EST, open the D_ContinuousMonitor.ssn.
Figure 450 Continuous Monitor Test
2. To monitor signal voltage, run KOEO Continuous
Monitor Test. For help, see “Continuous Monitor
Test” in Section 3 (page 68).
3. Monitor EOT signal voltage. Verify an active DTC
for the EOT circuit.
4. If code is active, do step 6 and 7 to check circuit
for the EOT sensor using the following table.
• Circuit Checks for EOT Sensor
5. If code is inactive, wiggle connectors and wires
at all suspected problem loca tio ns. If circu it
continuity is interrup te d, the EST will display
DTCs related to the condition.
6. Disconnect engine harness from temperature
sensor.
NOTE: Inspect connectors for damaged pins,
corrosion, or loose pins. Repair if necessary.
7. Connect Temperature Sensor Breakout Harness
to engine harness only.
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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