Volvo D13 Manuel D’Utilisation

PA1561 

4 

to the diaphragm causes the diaphragm to 
deflect and the amplifier to produce an electrical 
signal proportional to the deflection. 

The Ambient (Atmospheric) Pressure Sensor is 
built into the Engine Management System 
(EMS) Module.  

Camshaft Position Sensor 

The Camshaft Position (Engine Position) Sensor 
is located in the rear face of the timing gear 
cover at the rear of the engine, near the bottom 
of the valve cover. It uses magnetic induction to 
generate a pulsed electrical signal. It senses the 
passage of seven (7) timing bumps on the edge 
of the camshaft dampener. Six of the holes 
correspond to the phasing of the electronic unit 
injectors, while the seventh hole indicates the 
top dead center position.  

Crankshaft Position (Engine Speed) Sensor 

The Crankshaft Position (Engine Speed) Sensor 
uses magnetic induction to generate a pulsed 
electrical signal. Notches are machined into the 
edge of the flywheel. When one of the notches 
passes close to the sensor, electric pulses 
result. 

The Crankshaft Position (Engine Speed) Sensor 
also indicates when the crankshaft is at the top 
dead center position. 

Differential Pressure DP Sensor  

The differential pressure sensor is used for flow 
measurement of the Diesel Particulate Filter 
(DPF). This sensor has two pressure ports and 
senses the difference in pressure between the 
two ports. Measurement of the pressure before 
and after the DPF is used to calculate diesel 
filter regeneration.  

The Differential Pressure DPF Sensor is located 
on the side of the Diesel Particulate Filter (DPF).  

EGR Differential Pressure Sensor  

The EGR differential pressure sensor is used for 
flow measurement of the Exhaust Gas 
Recirculation (EGR) valve. This sensor has two 
pressure ports and senses the difference in 
pressure between the two ports. Measurement 
of the pressure before and after the EGR valve 
is used to calculate EGR flow.  

The EGR Differential Pressure Sensor is located 
on the left or right side of the engine.  

EGR Temperature Sensor  

The EGR temperature sensor detects exhaust 
gas temperature for EGR system. The sensor 
modifies a voltage signal from the control unit. 
The modified signal returns to the control unit as 
the exhaust temperature of the EGR system to 
confirm EGR operation. The sensor uses a 
thermistor that is sensitive to the change in 
temperature. 

The EGR Temperature Sensor is located near 
the EGR valve. 

Engine Coolant Level (ECL) Sensor 

The Engine Coolant Level (ECL) Sensor is a 
switch. If engine coolant level falls below a 
calibrated point the contacts open and the driver 
will be notified of the low coolant level.  

The Engine Coolant Level (ECL) Sensor is 
located in the cooling system reservoir tank.  

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 ambient 
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