1995 RENAULT MEGANE SCENIC wheel

86065-3R
IGNITION
Static ignition
17
F3R - K7M
engines
NOTE : advance correction depending on the si-
gnal from the pinking sensor is dealt with in sec-
tion 17 Injection.
Cylinder 1 is at the flywheel end.SPECIAL NOTES FOR THE FLYWHEEL
Description
The flywheel has 60 regularly spaced teeth. Two
teeth have been removed to create a fixed marker
gap at 84° or 14 teeth before TDC for cylinders 1
and 4. There are therefore in fact only 58 teeth.
Cylinders 1 and 4 are at TDC when the arrow (A)
passes in front of the engine speed sensor (169).
Cylinders 2 and 3 are at TDC when the arrow (B)
passes in front of the engine speed sensor (169).
Operating principle
The computer knows that TDC for cylinders 1 and
4 is located on the rising edge of the 15th tooth
after the fixed gap. Consequently, depending on
the amount of advance to be used, the computer
knows exactly where to locate the ignition point
by counting the number of teeth.
TDC for cylinders 2 and 3 is located on the rising
edge of the 45th tooth after the fixed gap.
17-4

SPECIAL NOTES FOR BOSCH MONOPOINT INJECTION
• Use the XR25 with the latest cassette and fiche n° 28.
Read the computer Part Number using code G70*.
Erase the memory using code G0**.
• Injection warning light operational (see principle of ignition section).
• Maximum engine speed before ignition cut-out: 6 500 rpm.
• Corrected idle speed after operation of the air conditioning: 900 rpm.
• Corrected idle speed with wheels at full lock (power assisted steering pressostat information) : 825 rpm.
• Canister bleed solenoid valve controlled by RCO signal depending on engine operating conditions (the
valve is not operated for no load).
• If there is a fault with the absolute pressure sensor, the manifold pressure is recreated depending on the
throttle position and the engine speed.
• Reading of the default values from the air temperature sensor (#03) or coolant temperature sensor (#02),
not the values taken in defect mode by the computer when they are recognised as being faulty.
• There is a+after ignition input (track 30) to inform the computer that the ignition has been turned off
while it remains fed for a few seconds to reposition the idle speed micromotor.
(Avoids false detection of a fault in the engine immobiliser system).
INJECTION
General
17
E7J engine
FITTING A 2ND GENERATION ENGINE IMMOBILISER REQUIRES A SPECIAL PROCEDURE FOR REPLACING THE
COMPUTER.
17-6

INJECTION
Special notes on semi-sequential injection
17
K7M engine
OPERATING PRINCIPLE
The K7M engine is fitted with semi-sequential injection.
Injection of fuel is carried out simultaneously to cylinders 1 - 4 and cylinders 2 - 3.
To do this, the two pairs of injectors are connected to two injection computer tracks:
- the injectors for cylinders 1 and 4 are connected to computer track 4 ,
- the injectors for cylinders 2 and 3 are connected to computer track 30 .
For each cylinder, there is one injection per revolution, i.e. two per cycle. These injections take place during
the compression and exhaust phases.
The injection computer uses the same system as that used to control the ignition coils for determining when
to control which injector. By analysing the signal from the flywheel, it knows the TDC point for cylinders 1 - 4
and cylinders 2 - 3 (see principle in section 17 "Ignition"). By counting the number of teeth, the engine phases
preceding TDC maybe determined.
17-17

INJECTION
Special notes on sequential injection
17
F3R engine
PRESENTATION
The F3R engine is fitted with sequential injection.
Injection of fuel is not carried out simultaneously
to all four cylinders as with conventional injection,
but cylinder after cylinder when they are at the
start of the inlet phase.
To do this, it is necessary for:
- each injector to be connected separately to
the computer (injector n° 1 is at the flywheel
end),
- the computer to know which cylinder is at the
inlet phase.
To determine the cylinder at the inlet phase, the
computer uses 2 sensors:
- the TDC sensor,
- the cylinder reference sensor.
The TDC sensor allows the computer to determine
the engine speed, and to know which cylinders
are at TDC:
- cylinders 1 and 4 at TDC,
- cylinders 2 and 3 at TDC.
The cylinder reference sensor allows the computer
to know which of the two cylinders at TDC is at
the start of the inlet phase.
DEFECT MODE IN THE CASE OF A FAULT WITH THE
CYLINDER REFERENCE SENSOR
The system remains in sequential injection. The
cycle 1 - 3 - 4 - 2 is retained.
When fuel is injected for the first time, or at the
beginning of the starting phase, the computer
decides arbitrarily to inject fuel to cylinder n° 1
when cylinders 1 and 4 are at TDC.
Two possibilities may then arise:
- the system is phased correctly,
- the system is out of phase by one revolution.
Operation of the engine is not greatly affected.
DESCRIPTION
The cylinder reference sensor (A) is located at the
end of the camshaft. It is mounted by three bolts
on to the cylinder head.
The sensor is opposite a long target of 180°. This is
mounted on the end of the camshaft.
If the target is located within the sensor air gap,
12 V is sent to the computer.
If the target is not in the sensor airgap, 0 V is sent
to the computer.
SENSOR OPERATING PRINCIPLE
The sensor is supplied with 12 Volts. The computer
sends it a 5 V feed on track 2.
Depending on the position of the target, the sen-
sor closes the circuit and earths this voltage (the
computer receives 0 V), or the sensor leaves the
circuit open (the computer receives 12 V).
99238R3
17-19

INJECTION
Special notes on sequential injection
17
F3R engine
A 1 rotation of the crankshaft
B 1 rotation of the camshaft
C TDC 1 - 4
D TDC 2 - 3
1 Cylinder 1 at inlet
2 Cylinder 2 at inlet
3 Cylinder 3 at inlet
4 Cylinder 4 at inlet
5 Gap in flywheel
684° or 14 teeth
7 30 teeth
X Flywheel target
Y Camshaft target
Z Voltage from cylinder reference sensor
NOTE : All values are given in TDC degrees.
98406R1
17-21

INJECTION
Operating wiring diagram
17
TrackALLOCATION
25Not used
26Not used
27Not used
28Command for coil for cylinders 1 and 4
29Command for coil for cylinders 2 and 3
30Command for injector n° 1 and n° 4 via earth (n° 1 flywheel end)
31Pinking sensor screened cable
32+12 V before ignition
33TDC sensor signal (track B)
34TDC sensor signal (track A)
35Stepping motor command (0 - 12 V)
36Stepping motor command (0 - 12 V)
37Immobiliser coded line input
38Uni-directional diagnostic line L for entry into diagnostic mode only
(looking for computer)
39Not used
40Stepping motor command (0 - 12 V)
41Throttle angle information for automatic transmission computer
42RCO control (sequential earth period for canister bleed solenoid valve RCO)
43Command for injection fault warning light on instrument panel
44Common earth for pinking sensor and coolant temperature sensor and absolute pressure sensor
45+ 5 V feed for absolute pressure sensor and throttle position potentiometer
46Common earth for air temperature sensor and throttle position potentiometer
47Not used
48Command (via earth) for fuel pump relay and engine speed information
49Not used
K7M engine
17-45

INJECTION
Operating wiring diagram
17
TrackALLOCATION
50R.C.O. command (sequential earth period) for canister bleed solenoid
51Air conditioning compressor clutch operation prevention command
(0 V → authorisation ; 12 V → prevention)
52Monitoring of injector feed and fuel pump feed from relay (236)
53Command for injector n° 1 via earth (flywheel end)
54R.C.O. command (sequential earth period) for idle speed regulation valve
55Not used
F3R engine
17-50

21-1
21-2
21-3
21-4
21-5
21-5
21-6
21-9
21-19
21-23
21-26
Contents
Page
23-1
23-2
23-3
23-3
23-4
23-5
23-5
23-5
23-6
23-6
23-7
23-8
23-8
23-9
23-15
23-20
23-23
23-27
23-29 Section view
Use
Identification
Gear ratios
Gear change thresholds
Consumables
Parts to be systematically replaced
Oil
Oil change frequencies
Fault warning light
Draining
Filling - levels
Oil pressure
Hydraulic distributor
Automatic transmission (Removal -
Refitting)
Differential output seal
Wiring
Wiring diagram
Checking the "timing point" on the
converter AUTOMATIC TRANSMISSION
23
Transmission
CLUTCH
Identification
Section views
Exploded views
Consumables
Fault finding
Mechanism - Plate
Thrust pad - Fork20
20-1
20-3
20-3
20-4
20-5
20-13
20-14
Identification
Ratios
Capacity -Lubricants
Special notes
Consumables
Parts to be systematically replaced
Fault finding
Gearbox (Removal - Refitting)
5th gear on the vehicle
Differential output seal
Speedometer drive gear
MANUAL GEARBOX21
29-1
29-2
29-9
29-10
29-17
29-24 Consumables
Driveshafts
Front transverse driveshafts
Gaiter on wheel end
Gaiter on gearbox end
Bearing gaiter DRIVESHAFTS
29
Page