speed sensor RENAULT SCENIC 2000 J64 / 1.G Technical Note 3426A User Guide

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Coolant temperature management
13
13-41
Coolant temperature management
CCTM
This system allows the engine cooling fan to be
controlled by the injection computer. It consists of a
single coolant temperature sensor serving injection,
the engine cooling fan, the temperature indicator and
the instrument panel temperature warning light.OPERATION
The injection computer controls, as a function of the
coolant temperature:
– the injection system,
– the engine cooling fan relays:
!the fan is kept at a low speed if the coolant
temperature exceeds 99 ˚C and stops when the
temperature drops below 96 ˚C,
!the fan is kept at a high speed if the coolant
temperature exceeds 102 ˚C and stops when the
temperature drops below 99 ˚C,
!the fan can be controlled by the air conditioning.
For vehicles without air conditioning, only the low
speed engine cooling fan is operational.
COOLANT TEMPERATURE WARNING LIGHT
(shared with the injection fault warning light)
The warning light is controlled by the computer.
It is illuminated when the temperature exceeds 120 ˚C.
16179R1
244 Coolant temperature sensor (injection and
coolant temperature indication on the
instrument panel).
Three track sensor, two tracks for coolant
temperature information and one track for
indication on the instrument panel.

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Computer
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13-42
Computer
TRACK ASSIGNMENT
Connector A
H2
H3
H4
G1
G2
G3
G4
F1
F3
F4
E1
E2
E3
E4
D3
D4
C1
C3
B1
B3
A3---
→
→
→
←
→
←
←
←
→
---
←
→
←
→←
→
←
→←
→
---
---THROTTLE POTENTIOMETER SUPPLY (TRACK 2)
OBD WARNING LIGHT
COOLANT TEMPERATURE WARNING OUTPUT
PREHEATING WARNING LIGHT OUTPUT
IMMOBILISER INPUT
FAULT WARNING LIGHT OUTPUT
POWER CONSUMED
THROTTLE POTENTIOMETER INPUT (TRACK 2)
FUEL CUT-OFF SOLENOID INPUT
AIR CONDITIONING INHIBITION OUTPUT
THROTTLE POTENTIOMETER SUPPLY (TRACK 1)
CLUTCH BREAKER INPUT
CONSUMPTION INFORMATION OUTPUT
VEHICLE SPEED INPUT
FAULT FINDING
ENGINE SPEED INFORMATION
THROTTLE POTENTIOMETER INPUT (TRACK 1)
FAULT FINDING
HEATED REAR WINDSCREEN INPUT
THROTTLE POTENTIOMETER EARTH (TRACK 1)
THROTTLE POTENTIOMETER EARTH (TRACK 2)
Connector B
B3
B2
C3
C2
C1
D4
D3
D1
E3
E1
F2
G3
G2
G1
H4
H3
H2
J3
J2
K3
L4
L3
L2
L1
M4
M3
M2
M1←
---
→
←
←
→
←
←
---
---
---
←
---
---
←
←
---
←
---
←
---
---
→
→
---
---
---
→PLUGS DIAGNOSTICS INPUT (1)
EGR POTENTIOMETER POSITION EARTH
PREHEATING RELAY CONTROL
EGR POTENTIOMETER POSITION SIGNAL INPUT
TURBOCHARGER PRESSURE INPUT SENSOR
SUPPLY RELAY CONTROL OUTPUT
AIR TEMPERATURE SENSOR INPUT
DIESEL PRESSURE INPUT SENSOR
+ AFTER IGNITION FEED
COOLANT TEMPERATURE SENSOR EARTH
EGR POTENTIOMETER POSITION SUPPLY
ENGINE SPEED SIGNAL SENSOR
AIR FLOW METER SUPPLY
FUEL TEMPERATURE SENSOR EARTH
AIR FLOW METER SIGNAL INPUT
ENGINE SPEED SIGNAL SENSOR
DIESEL PRESSURE SUPPLY SENSOR
FUEL TEMPERATURE INPUT
TURBOCHARGER PRESSURE SUPPLY SENSOR
COOLANT TEMPERATURE SENSOR INPUT
POWER EARTH
POWER EARTH
TURBO PRESSURE SOLENOID VALVE CONTROL OUTPUT
PRESSURE REGULATOR SOLENOID VALVE CONTROL OUTPUT
POWER EARTH
+ AFTER RELAY
+ AFTER RELAY
EGR SOLENOID CONTROL OUTPUT

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Computer
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Connector C
A4
A3
A2
A1
B4
B3
C1
E4
J4
K4
L4
L3
L2
L1
M4
M3
M2
M1---
---
→
→
→
---
---
→
→
←
→
---
---
→
---
---
→
→TURBOCHARGER PRESSURE SENSOR EARTH
FLOW METER EARTH
LOW SPEED FAN RELAY CONTROL OUTPUT
ELECTRIC FUEL PUMP CONTROL OUTPUT
HIGH SPEED FAN RELAY CONTROL OUTPUT
DIESEL PRESSURE SENSOR EARTH
CAMSHAFT POSITION SENSOR EARTH
ADDITIONAL HEATING CONTROL OUTPUT
ADDITIONAL HEATING CONTROL OUTPUT
CAMSHAFT POSITION SIGNAL SENSOR
INJECTOR 2 CONTROL
INJECTOR 2 SUPPLY
INJECTOR 3 SUPPLY
INJECTOR 4 CONTROL
INJECTOR 4 SUPPLY
INJECTOR 1 SUPPLY
INJECTOR 3 CONTROL
INJECTOR 1 CONTROL

Downloaded from www.Manualslib.com manuals search engine ANTIPOLLUTION
Exhaust gas recirculation
14
14-3
OPERATING PRINCIPLE
The valve is controlled by an RCO signal issued by the
injection computer. The RCO signal permits
modulation of the opening of the valve, and
consequently, the quantity of exhaust gas directed
back towards the inlet manifold.
The computer continuously carries out a test to detect
the position of the EGR valve flap.
OPERATING CONDITIONS
The parameters which determine the actuation of the
EGR valve are as follows:
– the coolant temperature,
– the air temperature,
– the air pressure,
– the accelerator pedal position,
– the engine speed.
The EGR function is cut if:
– the battery voltage is less than 9 volts,
– the engine speed is greater than 3000 rpm.,
– a characteristics map (engine speed/load) exceeds a
given threshold,
– the vehicle speed is less than 12 km/h, the engine
speed is less than 1000 rpm and if the coolant
temperature is greater than 60 ˚C for 40 seconds.
The EGR valve is not supplied after engine start
according to a coolant temperature characteristics
map.
time (s)The electric EGR valve is supplied for 40 seconds on
each return to idling speed if the air temperature is
greater than 15 ˚C.
Coolant
temperature (˚C)
15761R
1
2
4
5
6Solenoid supply
Sensor supply
Sensor earth
Solenoid earth
Sensor output
-20 0 17 20