Page 90 of 208
FUEL SUPPLY
Fuel pressure
13
CHECKING THE FUEL PRESSURE
SPECIAL TOOLING REQUIRED
Mot. 1311-01 Fuel pressure test kit (with a pressure
gauge 0; + 10 bar tool kit)
Mot. 1311-05 Junction tool (for union J)
IMPORTANT : during the opening of the fuel cir-
cuit , be sure to use a cloth to avoid possible pro-
jections of fuel due to the residual pressure.
Disconnect the fuel supply pipe.
Fit tool Mot. 1311-04 on the injector gallery, then
reconnect the fuel supply pipe to the tool itself.
13244-1R
EF7 Engine
Connect the pressure gauge 0; + 10 bars with
the flexible pipe Mot. 1311-01.
99376R
13-10
Page 91 of 208
FUEL SUPPLY
Fuel pressure
13E7J Engine
Shunt terminals (3) and(5) of the fuel pump relay
(L) located in the engine fuse box .
12839S
The pressure must be 3 bars ± 0.2.
By applying a pressure of 500 mbars to the
pressure regulator, a fuel pressure of 2.5 bars ±
0.2 should be obtained.
13-11
Page 92 of 208
FUEL SUPPLY
Antipercolation device
13
When the ignition is switched off, the coolant temperature monitoring mode begins.
E7J Engine
Monitoring mode
Water temperature≥ 101°C
Coolant temperature ≤ 96°C Cooling fan assembly control time
≥ 10 minutes
Cooling fan assembly stops
Exit from monitoring mode
The monitoring mode is left 2 minutes after switching off the ignition in cases where the coolant
temperature is not greater than or equal to 101°C or once the coolant temperature falls below 92°C.
no
yes
nono
yes yes
High speed cooling fan assembly command
13-12
Page 93 of 208

DIESEL EQUIPMENT
General
13
The use of electronic injection in Diesel engines has allowed the operational power of these engines to be
optimised, thus reducing the emission rate of pollutant gases.
The system consists of a computer, which receives information from:
- the coolant temperature sensor,
- the air temperature sensor,
- the engine speed sensor,
- the vehicle speed sensor,
- the load potentiometer,
- the injection start sensor, which forms part of the injector of cylinder n° 3 (injector with sensor).
It controls :
- the injection pump :
• the altimetric corrector (F8Q 630) via a relay
• the advance solenoid valve.
- the cold engine starting system (heater plugs and pre-postheating unit),
- the exhaust gas recycling system (EGR),
- the diesel injection fault warning light,
- the preheating warning light,
- the solenoid valve controlling the fast idle speed LDA,
- the relay controlling the power assisted steering electric pump assembly (for vehicles with air conditio-
ning), the pump assembly is supplied once the engine speed exceeds 650 rpm.
It carries out a self diagnosis procedure which may be visualised through the
XR25.
SPECIAL FEATURES
On the injection pump it is possible to replace:
- the load potentiometer,
- the advance solenoid valve,
- the altimetric corrector,
- the electrical solenoid.
13-13
Page 94 of 208
DIESEL EQUIPMENT
Specifications
13
Vehicles GearboxEngine
Type SuffixBore
(mm)Stroke
(mm)Capacity
(cm
3)RatioCatalytic
converterDepollution
standard
XC0D JB F8Q 662 80 93 1 870 21.5/1 C67 EU96
XC0E JB F8Q 630 80 93 1 870 21.5/1 C67 EU96
Vehicles
ENGINE SPEED (rpm)
Idle speedno load
maximumfull load
maximum
SMOKE OPACITY
Homologation value Legal maximum
XC0D 825 ± 50 4 600 ± 100 4 100 ± 100 1.05 m
-1 (35 %) 2.5 m -1 (64 %)
XC0E 825 ± 50 4 600 ± 100 4 100 ± 100 1.11 m
-1 (36 %) 2.5 m -1 (64 %)
Temperature in °C (± 1°) 0 20 40 80 90
Air temperature sensor
Siemens CTN type
Resistance in Ohms7470 to
119703060 to 4045 1315 to 1600 - -
Coolant temperature sensor
Siemens CTN type
Resistance in Ohms- 3060 to 4045 1315 to 1600 300 to 370 210 to 270
13-14
Page 98 of 208
DIESEL EQUIPMENT
Location of components
13
20 EGR valve
13047-1R
7Engine speed sensor
13048R
87970R
17Diesel injection fault warning light
18Preheating warning light
Warning light illuminates when ignition is
switched on during preheating phase.
12839S
C Power assisted steering pump assembly relay
HAltimetric corrector relay
LInjection locking relay
MDiesel heating relay
13-18
Page 101 of 208
DIESEL EQUIPMENT
Advance solenoid valve
13
ITB191917
REFITTING
It is VITAL to remove the small filter (3) situated at
the bottom of the system, using a pair of thin-
nose pliers, and replace with a new filter.
The outer part serves as a seal and locks on
tightening the actuator.
Replace, in the following order : the seal at (4) of
the "banjo" return connection (5) ; the new
activator (1) fitted with an external filter, along
with the the two seals at (6) and (7).
Tighten the actuator to a torque of 3 daN.m
using socket Mot. 997-01.
Place the new protective cover (2)on the actuator.
Reconnect the two terminals to the connector.
Reconnect the connector itself.
Replace the protective sheath on the wiring,
along with the retaining clip.Bleed the diesel circuit using the priming pump
before starting the engine.
It is IMPERATIVE to erase the computer memory
by pressing G0**.
It is vital to road test the vehicle after the
operation.
13127R
13-21
Page 104 of 208
DIESEL EQUIPMENT
Altimetric corrector
13
REFITTING
It is VITAL to remove the small filter (2) situated at
the bottom of the system using a pair of thin -
nosed pliers, and replace it with a new one.
Tighten the actuator (1) to a torque of 3 daN.m
using the socket Mot. 1440.
Place a new protective cover on the actuator.
Reconnect the two terminals to the connector.Reconnect the connector.
Replace the protective sheath on the wiring,
along with the retaining clip.
Bleed the diesel circuit using the priming pump
before starting the engine.
It is IMPERATIVE to erase the computer memory
by pressing G0**.
It is vital to road test the vehicle after this
operation.
13128R
F8Q 662
FUNCTION : it acts on the flow in proportion to altitude ; if the vehicle is running at
an altitude greater than or equal to 1 000 metres, the computer reduces the flow by
3 mm
3/stroke. The conventional flow is reestablished if the vehicle runs at an alti-
tude lower than 900 metres.
13-24