RENAULT MEGANE SCENIC 1995 Service Repair Manual

FUEL MIXTURE
Specifications
12
DESCRIPTION MAKE/TYPE SPECIAL NOTES
ComputerSIEMENS FENIX 555 tracks
Injection Sequential regulated multipoint injection
Ignition Static with two dual output coils
Power module integral in computer
One pinking sensor
Plugs
EYQUEM C 52 LS
CHAMPION N7YCX
BOSCH W7DCOGap: 0.9 mm
Tightening torque: 2.5 to 3 daN.m
Air filter Replace every other oil change
Fuel filter Mounted in front of the fuel tank under the vehicle
Replace at major service
Fuel pump
WALBROSubmerged in fuel tank
Flow: 80 litres/hour minimum for regulated
pressure of 3 bars and voltage of 12 V
Pressure regulator WEBER
BOSCHRegulated pressure
Zero vacuum: 3 ± 0.2 bars
Vacuum of 500 mbar : 2.5 ± 0.2 bars
Solenoid injector
SIEMENSVoltage: 12 V
Resistance: 14.5 ± 1 Ω
Throttle body SOLEX
Diameter 60 mmReference: 127 F3R 751 without AC - F3R 750
Reference: 132 F3R 751 AC
Idle speed regulation solenoid
HITACHI
AESP 207-17Voltage: 12 V
Resistance: 9.5 ± 1 Ω
Fuel vapour recirculation
canister
Solenoid valve
CAN 10
DELCO REMY
Voltage: 12 V
Resistance: 35 ± 5 Ω
Heated oxygen sensor
BOSCH LSH 25Voltage at 850°C
Rich mixture: > 625 mvolt
Lean mixture: 0 to 80 mvolt
Tightening torque: 4.5 daN.m
Fault finding
FICHE n° 27
CODE D13
SELECTOR ON S8
Throttle potentiometer
Idle speed regulation: 8 ≤ #17 ≤ 38
Full load: 188 ≤ #17 ≤ 245
R.C.O. idle speed: 20 % ≤ #12 ≤ 40 % (F3R 750)
18 % ≤ #12 ≤ 38 % (F3R 751)
Adaptive R.C.O
idle speed: - 6.2 % or - 8.6 ≤ #21 ≤ + 6.2 %
Adaptive richness
operation: 82 ≤ #30 ≤ 224
Adaptive richness idle speed: 32 ≤ #31 ≤ 224
12-6

FUEL MIXTURE
Throttle body
12
E7J engine
PRESENTATION
94542R
1Air temperature sensor
2Fuel pressure regulator
3Fuel return to fuel tank
4Fuel supply
5Throttle opening motor
6Monopoint injector
Connector (A)
Injector and air temperature sensor operations
1 and 4Air temperature sensor
2+monopoint injector
3 - monopoint injector
Connector (B)
Idle speed regulation and low load switch
operations
1 + or -Motor feed
2 - or +Motor feed
3 and 4Low load switchConnector (C)
Throttle potentiometer operation
1Earth
2+ 5 V feed
4Throttle position information (voltage
changes between 0 and 5 V)
5Not used
The throttle body has two sections:
• The upper section is known as the injection
section (D).
• The lower section is known as the throttle
section (E).
NOTE : when the unit is removed, the two sections
are joined together by plastic clips. Squeeze the
end of the clips to separate the two sections.
94543-2R3
12-7

FUEL MIXTURE
Throttle body
12
E7J engine
REMOVAL
Remove the air filter.
Disconnect:
- connectors (A) (B) and (C),
- the fuel supply pipes (1) and return pipes (2),
- the accelerator control cable (3).
Remove the mounting bolts (4) and remove the
throttle body.
94544R
REFITTING
Replace the seals between the manifold and the
throttle body.
Reconnect:
- the fuel supply and return pipes, ensuring the
connectors are correctly clipped back together,
- the accelerator control and refit the air filter.
AIR TEMPERATURE SENSOR
REMOVAL
Remove the air filter.
Disconnect the connector.
Remove bolt (1) and lift cover (2).
Release the wires from mounting (3).
Remove the connector (4) after releasing hooks
(5).
94541R
REFITTING
Check the connectors are correctly clipped in.
12-8

FUEL MIXTURE
Throttle body
12
E7J engine
INJECTOR
REMOVAL
Remove the air filter.
Remove the air temperature cover (see previous
page).
Remove the injector (6) from its housing.
94539R
REFITTING
Replace the O rings and lubricate them.
Fit the injector and cover so that they are correctly
aligned and mount the assembly.
REMOVING - REFITTING THE FUEL PRESSURE
REGULATOR
The fuel pressure regulator cannot be adjusted if
it is faulty. The upper section of the throttle body
must be renewed.
IDLE SPEED REGULATION MOTOR
REMOVAL
Remove the air filter.
The motor may be removed without having to
remove the throttle body. Access to the bolts is
made easier however by removing the mounting
bolts for the throttle body and releasing it
without disconnecting the fuel pipes.
Disconnect the motor connector.
Remove the mounting bolts and remove the
motor.
REFITTING
No adjustment may be made. However, ignition
on, if the low load switch bargraph on the XR25 is
not illuminated, fit a shim between the throttle
stop and the micromotor to obtain the no load
switch position.
Turn the ignition on then off; the micromotor
should position itself in the cold start position.
Repeat the operation without the shim, then
check the position of the throttle, ignition on,
engine not running, using the XR25 and #17.
94540S
12-9

FUEL MIXTURE
Throttle body
12
E7J engine
THROTTLE POTENTIOMETER
The throttle potentiometer is set in the factory
and cannot be repaired.
If there is a fault, renew the throttle body section.
REMOVAL
Remove the air filter and the complete
monopoint throttle body assembly (see previous
pages).
Remove the upper section of the throttle body
and the idle speed regulation motor.
94538S
REFITTING
Renew the seals.
Refit the throttle body peripherals.
Check:
- the connectors are correctly connected,
- on the
XR25 :
•the bargraphs are present for :
- low load,
- full load.
•the throttle position using the XR25 and
#17.
Refit the air filter.
12-10

FUEL MIXTURE
Throttle body
12
K7M engine
Throttle body mounting bolt
on inlet manifold 2
TIGHTENING TORQUES (in daN.m)
REMOVAL
Remove the acoustic tie bar.
Disconnect:
- the air temperature sensor (1),
- the oil vapour rebreathing pipe (2) on the
rocker box cover.
Slacken the clips (3) mounting the air sleeve (4) to
the air filter and the throttle body, then remove
the sleeve.
99359R
Disconnect :
- the accelerator cable (5),
- the throttle position potentiometer connector
(6),
- the idle speed regulation stepping motor
connector (7).
99357R
Remove the four bolts mounting the throttle
body and remove the throttle body.
99358-1R
12-11

FUEL MIXTURE
Throttle body
12
K7M engine
To make the operation easier, remove the throttle
body to remove the potentiometer and the idle
speed regulation stepping motor.
99363S
The throttle position potentiometer is not
adjustable.
REFITTING
Renew the seal between the throttle body and
the manifold.
The remaining refitting operations are the reverse
of removal.
12-12

99239R
FUEL MIXTURE
Throttle body
12
Disconnect :
- the accelerator cable (4),
- the oil vapour rebreathing pipe (5),
- the two water hoses (6) which heat the
throttle body after clamping them using tool
Mot. 453-01.
Remove the four mounting bolts for the throttle
body and remove it.
Remove the heat shield between the throttle
body and the manifold. Throttle body mounting bolt
on inlet manifold 2
Throttle potentiometer mounting bolt 0.2
TIGHTENING TORQUES (in daN.m)
REMOVAL
Disconnect the battery.
Remove the three bolts mounting the unit to the
air filter.
99213R
Disconnect:
- the air temperature sensor (1),
- the throttle position potentiometer (8).
Slacken the clip mounting the air sleeve (2) to the
throttle body.
99238R
F3R engine
Remove the air filter and the air sleeve.
12-13

FUEL MIXTURE
Throttle body
12
NOTE : the throttle position potentiometer (7)
may only be removed after removing the throttle
body (non-adjustable).
99223R
REFITTING
Remove the seals bonded on the heat shield for
the throttle body and renew them (it is not
necessary to bond them into position again).
Refitting is then the reverse of removal. F3R engine
12-14

FUEL MIXTURE
Inlet manifold
12
E7J engine
Manifold nuts 2.5
TIGHTENING TORQUES (in daN.m)
REMOVAL
To remove the manifold, the throttle body must
be removed (see previous pages).
There are no special notes for removal.
The inlet manifold is fitted with an electrical
heater (2) with a PTC type resistance (positive
temperature coefficient).
This is mounted in the inlet manifold, opposite
the throttle, and is secured by a circlip.
The heater is fed via a relay by the computer up to
a coolant temperature of 68°C.
If the coolant temperature sensor is faulty, the
heater is permanently fed.
PRM1202
1Retaining circlip.
2 Electrical heater.
3Seal.
REFITTING
When refitting, replace the manifold gasket and
bleed the cooling circuit.
12-15