Eot Operational Diagnostics - Navistar International DT 466 Diagnostic/Troubleshooting Manual

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 out-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 ground 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 second.
• 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 Test Adapter Kit

EOT Operational Diagnostics

WARNING: To avoid serious personal injury,
possible death, or damage to the engine or vehicle
– comply with the following:
Be careful to avoid rotating parts (belts and fan)
and hot engine surfaces.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
1. Using EST, open the D_ContinuousMonitor.ssn.
Figure 450
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.
•
5. If code is inactive, wiggle connectors and wires
at all suspected problem locations.
continuity is interrupted, 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
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Continuous Monitor Test
Circuit Checks for EOT Sensor
If circuit