Home » International DT466 » International DT466 – ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS – EOT Sensor (Engine Oil Temperature)

International DT466 – ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS – EOT Sensor (Engine Oil Temperature)

The function diagram for the EOT sensor includes the following:
• EOT sensor
• Electronic Control Module (ECM)
• Injection Driver Module (IDM)
• Fuel injector
• Exhaust Gas Recirculation Position (EGR)

• Variable Geometry Turbocharger (VGT)
• Injection Pressure Regulator (IPR)
• ENGINE lamp (amber)
Function
The EOT sensor is a thermistor sensor installed in the rear of the front cover, left of the high-pressure oil pump assembly. The ECM supplies a 5 V reference signal which the EOT sensor uses to produce an analog voltage that indicates temperature.

The EOT changes resistance when exposed to different temperatures. As oil temperature decreases, the resistance of the thermistor increases. This causes the signal voltage to increase. As oil temperature increases, the resistance of the
thermistor decreases. This causes the signal voltage to decrease.
The EOT sensor provides a feedback signal to the ECM indicating engine oil temperature. The ECM monitors the EOT signal to control fuel quantity and timing throughout the operating range of the engine.
The EOT signal allows the ECM to compensate for oil viscosity variations due to temperature changes in the operating environment, ensuring that adequate power and torque are available for all operating conditions.
During engine operation, if the ECM recognizes that the EOT signal is greater or less than the expected value it will set a DTC.

Fast Idle Advance
Fast idle advance increases engine cold idle speed up to 750 rpm (normally 700 rpm) for faster warm-up to
operating temperature. This is accomplished by the ECM monitoring the EOT sensor input and adjusting the fuel injector operation accordingly.
Low idle speed is increased proportionally when the engine oil temperature is between 15 °C (59 °F) at
700 rpm to below -10 °C (14 °F) at 750 rpm.