Iveco Daily. Manual

62089

62191

Figure 65

Figure 66

Figure 67

This an NTC sensor located in a boss of the thermostat body.

It detects the temperature of the water in the head and
makes it possible to reduce E.G.R. below a temperature of 40
ºC until shutting it off completely because when the engine
is cold it would cause high smoke and difficulty in starting.

It is connected to the control unit on pins 2 - 11.

Atmospheric pressure sensor (1), is set on engine
compartment right side and detects atmospheric pressure
value, thus enabling to reduce E.G.R. above 1,500 m altitude,
since the oxygen reduction connected to air density
reduction improves smokes in presence of E.G.R.

It is supplied at 5 V.

It is connected to the control unit on pins 9 - 10 - 11.

It supplies the control unit a signal of between 0

÷ 5V

depending on the environment pressure.

Modulated vacuum sensor (2) is set inside control unit and
corrects any error and/or miscalibration of the different
components to guarantee the proper vacuum value required
by the system.

It also makes it possible to detect any malfunctioning of the
E.G.R. system due to blowby or pneumatic failure of the
modulating solenoid valve.

Electronic control unit

Control unit (1) is set on engine compartment right side and
is connected to wiring by 25-pin connector.

It incorporates the vacuum sensor.

In addition to the E.G.R. it is capable of controlling the
before-after heating function, the engine cooling fan
electromagnetic joint, the KSB device and, where applicable,
it is connected to the climate control unit.

E.G.R. operating logic.

Depending on the position of the injection pump lever,
engine rpm, coolant fluid temperature and environment
pressure, the control unit decided the re-circulation
percentage to be activated and drives the modulating
solenoid valve.

Through the vacuum sensor (2) it reads the ”actual” vacuum
modulated by the modulating solenoid valve, compares it
with the theoretical one, and if the two values differ within
determinate parameters, it makes the necessary corrections
to control the modulating solenoid valve until reaching the
required ”actual” vacuum rating, otherwise, it does not take
account of it and controls the solenoid valve without the
reference signal.

Engine coolant temperature sensor

Absolute pressure sensor

Vacuum sensor

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Figure 68

Figure 69

Air conditioner interface operation logic

EGR

control unit

controls air

conditioning system

compressor (load) relay connections and disconnection and
obviously compressor activation or deactivation, at starting
and according to engine coolant temperature, i.c. engine rpm
and acceleration.

NOTE:

With load ON, compressor is OFF
With load OFF, compressor is ON

Starting: at starting, EGR control unit activates compressor
relay (NC). This load will be disconnected 6

± 1 sec. after

exceeding 700

± 25 engine rpm, thus enabling if required, to

activate compressor. Although engine rpm returns to lower
values than threshold ones, load will no longer be connected
until next engine starting.

Engine coolant temperature: load is activated at approx.
107ºC and deactivated at approx. 101ºC. Resistance values
for EGR engine coolant temperature sensor are approx.
160

Ω at 107ºC and approx. 195Ω at 101ºC.

Engine rpm: load is disconnected at

≥ 4000 rpm and

connected at

≤ 4100 rpm.

Acceleration: load disconnects for approx. 100 m/sec. at >
2500 i.c. engine rpm.

Pre-Post Heating Operating Logic

The control unit monitors pre-post heating as a function of
the engine compartment temperature measured by a sensor
located inside the control unit itself.

It activates the remote control switch controlling the plugs
(this switch is positioned on the right side of the engine
compartment) for a variable time as a function of the above
temperature.

Engine Cooling Fan Operating Logic

The

control

unit

can

connect/disconnect

the

electromagnetic coupling of the fan depending on the cooling
fluid temperature.

It connects it when ~94

°C are reached and disconnects it at

~76

°C. (The temperature sensor resistance at these values

is equal to ~245

Ω at 94°C and ~420Ω at 76°C).

KSB Operating Logic

At approximately 1000 m, the EGR electronic control unit
turns on, by activating the relevant remote control switch,
the KSB advance variator when the engine cooling fluid
temperature is equal to ~25

°C and turns it off at ~20°C.

The relevant resistance values of the engine cooling fluid
temperature sensor are: 3k

Ω ± 100Ω at 25°C and 3.8kΩ ±

100

Ω at 20°C.

Instead, at an altitude of approximately 1100 m, the variator
is activated at ~55

°C and disconnected at ~50°C. In this case

the resistance values of the sensor are, respectively,
900

±20Ω and 1.08kΩ ± 20Ω.

OPERATION LOGICS

CONNECTIONS OF GLOW PLUG CONTROL RELAY

BEFORE-AFTER WARMING DEVICE OPERATING GRAPH
A.WARMING ON AND WARNING LIGHT ON - B. WARMING TIME
ON WITH WARNING LIGHT ON - C. DISTRACTION TIME - D.
AFTER WARMING TIME - E. AFTER WARMING OFF AND WARNING
LIGHT OFF

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The test and adjustment values indi-
cated in the text and summary tables
are given as a general indication.

NOTE

FEEDING

281

AILY

Feeding

Page

INJECTION PUMP TEST VALUES

283

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Content .. 72 73 74 75 ..

Iveco Daily. Manual - part 74