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Group 23 EDC III
Design and operation
Tachometer sensor, flywheel (18)
This sensor is located on the left-hand side of the fly-
wheel housing.
The tachometer sensor on the flywheel is an inductive
sensor. It reads the crankshaft position and engine
speed using grooves in the flywheel. The signal is
sent to the control module, which calculates the injec-
tion angle and amount of fuel.
Charge air pressure/temperature
sensor (6)
Charge air pressure and charge air temperature are
measured with a combined sensor located on the inta-
ke manifold.
The charge air pressure sensor measures absolute
pressure, which is the sum of the charge air pressure
and atmospheric pressure. The sensor sends a signal
to the control module in the form of voltage that is pro-
portional to the absolute pressure. The sensor receives
a reference voltage of 5 Volts from the control module.
The charge air temperature sensor consists of a non-
linear resistor whose resistance depends on the tem-
perature of the resistor body. Resistance decreases
as temperature increases.
Coolant temperature sensor (15)
The sensor is located on the left-hand rear portion of
the cylinder head.
The sensor reads the temperature of the engine coo-
lant and sends the information to the control module.
It consists of a non-linear resistor whose resistance
depends on the temperature of the resistor body. Re-
sistance decreases as temperature increases.
Fuel pressure monitor (12)
The monitor is located on the left-hand side of the
engine, mounted in the fuel filter bracket.
Its task is to detect if the fuel pressure falls below
29 psi (2 BAR). The monitor is set to shut off when
pressure falls below 29 psi (2 BAR).
15
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