turn signal RENAULT MEGANE SCENIC 1995 Service Repair Manual

ANTIPOLLUTION
Fuel vapour recirculation
14
OPERATING PRINCIPLE
The fuel tank is connected to the outside through
the canister.
Fuel vapour is retained by the active carbon in the
canister.
So that the fuel vapour contained in the canister
does not evaporate into the atmosphere when
the fuel tank is opened, a valve isolates the canis-
ter from the fuel tank when the fuel filler cap is
removed.
The fuel vapour contained in the canister is elimi-
nated and burnt by the engine.
To do this, a pipe connects the canister and the in-
let manifold. A solenoid valve is located on this
pipe to control bleeding of the canister.
The operating principle for the solenoid valve is to
give a variable passage diameter (depending on
an RCO signal from the injection computer).
The variation in the selection of passage diameter
for the fuel vapour in the solenoid valve results
from the balance between a magnetic field crea-
ted by the feed to the coil and the force of a re-
turn spring ensuring the valve remains closed.
CONDITIONS FOR CANISTER BLEEDING
During richness regulation
Coolant temperature greater than:
- + 55°C (F3R engine),
- + 15°C (K7M engine),
- + 70°C (E7J engine).
Air temperature greater than:
- - 10°C (F3R engine),
- + 10°C (K7M engine),
- + 20°C (E7J engine).
No load position not recognised (if the throttle
position sensor is faulty, the non-recognition of
the no load condition is replaced by an engine
speed condition
engine speedR > 1500 rpm.).
Outside richness regulation
No load position not recognised.
Coolant temperature less than +15°C for
F3R and
K7M engines (no condition for E7J engine).
If the oxygen sensor is faulty, the canister is bled
when there is no no load.
The cyclical opening ratio for the canister bleed
solenoid valve may be seen using the XR25 and
#23. The solenoid valve is closed for #23 = 0.7 %
(minimum value) except for E7J engines (no #23).
14-4

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
Injection strategy / Automatic transmission
17
AUTOMATIC TRANSMISSION COMPUTER CONNECTION TO INJECTION COMPUTER
"Park"/"Neutral" position and torque reduction information.
These two items of information are sent on one track of the injection computer.
Signal transmitted
5 V
0 VPosition P/NChange to "drive"
Torque reduction changing down
Torque reduction changing up
1.In the "Park" or "Neutral" position, you can check whether the voltage, measured using a voltmeter
between track 7 and earth is actually approximately5 V.
As soon as the "drive" (or "other") position is reached, the voltage drops to approximately 0.
2.From the "drive" position and while driving, the automatic transmission computer sends:
- a long pulse for changing up a gear,
- two short pulses for changing down a gear.
The injection computer, in both cases, to smooth the gear change, retards the advance by 25° compared
to the initial advance, for the complete period of torque reduction if the vehicle speed is greater than 6
mph (10 km/h).
The advance returns to the initial setting:
- at once for changing up a gear,
- progressively for changing down a gear.1
2 Position "drive"
Nominal
advance
- 25°
17-28

INJECTION
Operating wiring diagram
17
E7J engine
TrackALLOCATION
25No load information input
26Not used
27Power module command
28TDC sensor signal input (track A)
29Immobiliser coded line input via decoder unit
30+ 12 V information when ignition turned on
31Pinking sensor noise signal input
32+ 12 V after ignition information
33Voltage information dependent on manifold pressure seen by sensor (on track B)
34Air conditioning compressor operation request input
35Voltage from oxygen sensor input
17-42