Volvo VT Serise Truck Engine Sensors Function Guide
by Dave Jack Auto Car Repair KnowledgeVolvo five electronic control modules are used; the Engine Management System (EMS) Module, Instrument Cluster Module (ICM), Vehicle Electronic Control Unit (VECU),
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Transmission Electronic Control Unit (TECU) and the Gear Selector Electronic Control Unit (GSECU).
Together,
these modules operate and communicate through the J1939 high speed
serial data line to control a variety of engine and vehicle cab
functions. The Engine Management System (EMS) Module controls fuel
timing and delivery, fan operation, engine protection functions, engine
brake operation, the EGR valve, and the turbocharger nozzle. The Vehicle
Electronic Control Unit (VECU) controls cruise control functions,
accessory relay controls and idle shutdown functions. The Instrument
Cluster Module (ICM) primarily displays operational parameters and
communicates these to the other ECU’s.
All have the capability to communicate over the J1587 normal speed data lines primarily for programming, diagnostics and data reporting. It is a full guide on Volvo VT engine sensors guide
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Engine Coolant Temperature (ECT) Sensor
The Engine Coolant Temperature Sensor is located at the front of the engine. The sensor will indicate a high coolant temperature caused by problems like radiator blockage, thermostat failure, heavy load, or high ambientD Design and Function temperatures. This sensor is also used for cold start enhancement and for fan clutch engagement.
Engine Oil Pressure (EOP) Sensor
The
Engine Oil Pressure Sensor contains a pressure sensitive diaphragm and a
electrical amplifier. Mechanical pressure applied to the diaphragm
causes the diaphragm to deflect and the amplifier to produce an
electrical signal proportional to the deflection.
The Engine Oil
Pressure Sensor is located on the oil filter assembly. The sensor
monitors engine oil pressure to warn of lubrication system failure.
Engine Oil Level (EOL) Sensor
The Engine Oil Level Sensor is located in the oil pan.
Engine Oil Temperature (EOT) Sensor
The
Engine Oil Temperature Sensor is a thermistor whose resistance varies
inversely to temperature. The sensor has a negative temperature
coefficient, which means the sensor resistance will decrease as the
engine oil temperature increases.
The Engine Oil Temperature Sensor is located in the oil pan.
Exhaust Temperature Sensor (DPF Sensors)
The exhaust gas temperature sensor detects exhaust gas temperature for DPF protection as well as DPF
regeneration
control. The sensor modifies a voltage signal from the control unit.
The modified signal returns to the control unit as the exhaust
temperature at that specific location of the exhaust. The sensor uses a
thermistor that is sensitive to the change in temperature.
The Exhaust Temperature Sensors are located in the DPF assembly.
Fuel
Pressure Sensor The fuel pressure sensor contains a diaphragm that
senses fuel pressure. A pressure change causes the diaphragm to flex,
inducing a stress or strain in the diaphragm. The resistor values in the
sensor change in proportion to the stress applied to the diaphragm and
produces an electrical output.
The Fuel Pressure Sensor is located on top of the fuel filter housing.
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Created on Mar 3rd 2022 19:45. Viewed 147 times.