sensor RENAULT MEGANE SCENIC 1995 Service Workshop Manual

INJECTION
General
17
E7J engine
1Injection computer
2Coolant temperature sensor (white connector)
3TDC sensor
4Fuel vapour recirculation solenoid valve
5Ignition power module
6Idle speed regulation micromotor
7Throttle position potentiometer
8Absolute pressure sensor
NOTES:
• the injector and the air temperature sensor are integral in the upper section of the throttle body (see sec-
tion 12),
• the pinking sensor is located under the inlet manifold,
• the diagnostic socket is located in the passenger compartment connection unit.
LOCATION OF COMPONENTS
17-7

INJECTION
General
17
K7M engine
1Injection computer
2Pinking sensor
3Coolant temperature sensor
4TDC sensor
5Fuel vapour recirculation solenoid valve
7Idle speed regulation stepping motor
8Throttle position potentiometer
9Air temperature sensor
10Absolute pressure sensor
11Canister
12Coil for cylinders 1 - 4
13Coil for cylinders 2 - 3
14Fuel pump relay
15Anti-interference condenser
16Air filter
17Oxygen sensor
18Power assisted steering pressostat
19EGR solenoid valve
20Vacuum reservoir
21EGR air filter
LOCATION OF COMPONENTS
17-9

INJECTION
General
17
F3R engine
1Injection computer
2Pinking sensor
3Coolant temperature sensor
4TDC sensor
5Fuel vapour recirculation solenoid valve
6Cylinder reference sensor
7Idle speed regulation solenoid valve
8Throttle position potentiometer
9Air temperature sensor
10Absolute pressure sensor
11Canister
12Coil for cylinders 1 - 4
13Coil for cylinders 2 - 3
14Fuel pump relay
15Anti-interference condenser
16Air filter
17Oxygen sensor
LOCATION OF COMPONENTS
17-11

99460-1R
INJECTION
Location of components
17
K7M engine
1Injection computer
99364R
99368R
99360R
3Coolant temperature sensor
4TDC sensor 2Pinking sensor
(tightening torque: 2.5 daN.m)
17-12

INJECTION
Location of components
17
K7M engine
7Idle speed regulation stepping motor
8Throttle position potentiometer
9Air temperature sensor
10Absolute pressure sensor
99359R3
12Coil for cylinders 1-4
13Coil for cylinders 2-3
15Anti-interference condenser
99365R1
17Oxygen sensor
(tightening torque: 4.5 daN.m)
99355-1R
99361R
5Fuel vapour recirculation solenoid valve
17-13

98900-1R1
INJECTION
Location of components
17
F3R engine
1Injection computer
5Fuel vapour recirculation solenoid valve
99218-1R
2Pinking sensor
(tightening torque : 2.5 daN.m)
12Coil for cylinders 1 - 4
13Coil for cylinders 2 - 3
15Anti-interference condenser
3Coolant temperature sensor (clipped)
6Cylinder reference sensor (see removal in
sub-section "Special notes for sequential in-
jection")
7Idle speed regulation solenoid valve
8Throttle position potentiometer (non-
adjustable)
9Air temperature sensor (clipped)
10Absolute pressure sensor
99238R2
4TDC sensor
99221R
17-15

INJECTION
Location of components
17
F3R engine
17Oxygen sensor
(tightening torque: 4.5 daN.m)
99224R
17-16

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
PRINCIPLE FOR RECOGNISING THE CYLINDER AT THE INLET PHASE
Depending on the signal from the TDC sensor, the computer knows at what moment cylinders 1 and 4 are at
TDC and at what moment cylinders 2 and 3 are at TDC. (For further explanations refer to section 17
"Ignition").
Cylinders 1 and 4 are at TDC,
- if the signal from the cylinder reference sensor is 0 Volts, cylinder 4 is at the start of the inlet phase,
- if the signal from the cylinder reference sensor is 12 Volt, cylinder 1 is at the start of the inlet phase.
Cylinders 2 and 3 are at TDC,
- if the signal from the cylinder reference sensor is 0 Volts, cylinder 3 is at the start of the inlet phase,
- if the signal from the cylinder reference sensor is 12 Volt, cylinder 2 is at the start of the inlet phase.
LOGIC
Signal from cylinder
reference sensorCylinder at start of inlet phase
12 Volt 1
0 Volts 4
12 Volt 2
0 Volts 3Cylinder at TDC
1 - 4
2 - 3
17-20

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