1995 RENAULT MEGANE SCENIC Service Repair Manual

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Page 241 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual 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

Page 242 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Special notes on semi-sequential injection
17
K7M engine
cylinder 2compression expansion exhaust inletTDC
TDC
cylinder 3
exhaust inlet compression expansionTDC
cylinder 1
TDC TDC
inlet

Page 243 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual 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

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

Page 244 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Special notes on sequential injection
17
F3R engine
PRINCIPLE FOR RECOGNISING THE CYLINDER AT THE INLET PHASE
Depending on the signal from the TDC sensor, the computer knows at what moment

Page 245 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual 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

Page 246 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Special notes on sequential injection
17
F3R engine
1.REMOVING THE CYLINDER REFERENCE
SENSOR
Disconnect the sensor
Remove:
- the cylinder reference sensor (A) (one bolt),
- the cover (B) (th

Page 247 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Special notes on sequential injection
17
F3R engine
CYLINDER REFERENCE SENSOR CONNECTIONS
TRACK ALLOCATION
1 Earth
2 Information to injection computer on track 42
3 +after ignition
1REMOVAL2

Page 248 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Injection fault warning light
17
PRINCIPLE FOR ILLUMINATION OF THE INJECTION FAULT WARNING LIGHT ON THE INSTRUMENT PANEL
• Vehicle without engine immobiliser system
When the ignition is tu

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