2000 RENAULT SCENIC air conditioning

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Injection/air conditioning programming
13
13-14
Injection/air conditioning programming
INJECTION COMPUTER/AC COMPUTER CONNECTION
The compressor is of the variable cubic capacity type.
The injection calculator and the air conditioning calculator are linked by two leads:
– The power absorbed information tells the injection computer the output absorbed by the compressor. It is possible
to see the output absorbed using the diagnostic tool. When air conditioning is engaged the reading should be
between 250 and 5000 Watts.
– The connection from the injection computer to the air conditioning computer. This lead carries information on
whether starting the compressor is authorized or forbidden.
When the air conditioning function is selected, idling speed is modified to reach a maximum of 875 rpm.
IMPORTANT: the absorbed output is never equal to 0, whatever the status of the compressor, engaged or not. The
minimum value read is approximately 250 Watts.

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Injection/air conditioning programming
13
13-15
COMPRESSOR OPERATION PROGRAMMING
During certain stages of operation, the diesel injection computer stops the compressor from functioning.
Engine start programming
The compressor is prevented from operating for 5 seconds after the engine has started.
Recovery of performance
When the position of the accelerator pedal is changed significantly and if the engine speed is less than 3000 rpm,
the compressor is prevented from operation for 5 seconds.
Recovery of output when the vehicle starts moving
If the position of the potentiometer is more than 50 % the engine speed is less than 2250 rpm and the vehicle speed
is below 20 km/h, the compressor is cut for 5 seconds.
Anti-stall protection
If the no load position is not detected, and the engine speed is less than 675 rpm. the compressor is disengaged. It
is engaged again after 5 seconds if the engine speed is increased.
Thermal protection programming
The compressor does not engage in cases where the coolant temperature is greater than + 112 °C.

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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
13
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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Alternator
16
16-2
REMOVAL
Put the vehicle on a 2 post lift.
Disconnect the battery as well as all electrical
connections on the alternator.
Separate the diesel filter from its mounting and
remove.
Unclip the power steering reservoir.
Release the air conditioning pipe at (A).
Remove:
– the wiring mounting support (1) and remove the unit,
– the front right wheel as well as the mudguard,
– the accessories belt.Special features of vehicles fitted with air
conditioning:
Before removing the accessories belt, check the
centreline of the automatic tensioner (see
section 07 "Accessories belt tension").
Loosen bolt (A), then bolt (B) until the shoulder is
exceeded while holding the automatic tensioner plate
using a 9.35 mm square, then relax the belt by moving
the ratchet in the direction of the arrow.
Remove:
– the bolts (A) and (B),
– the alternator mountings and remove the alternator. SPECIAL TOOLING REQUIRED
Mot. 1273 Tool for checking belt tension
16870R4
98837-1R4

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Alternator
16
16-3
REFITTING (special notes)
Refit in reverse order to removal.
The belts on vehicles fitted with air conditioning are
tensioned by bringing the automatic tensioner plate to
a stop at bolt (B), without forcing it, using a 9.35 mm
square.
See section 07 "Accessories belt tension" for the
belt tension value for vehicles without air conditioning.
NOTE: never refit a belt once it has been removed,
but replace it.
98837-1R1

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General
62
162AIR CONDITIONING
General
CONSUMABLES
– Oil for DELPHI HARRISON compressor:
PLANETELF PAG 488: 220 cm
3 ± 15
(to be ordered from ELF).
– Refrigerant:
R134a: 780 g ± 35 (Mégane)
R134a: 680 g ± 35 (Scénic)
– Compressor:
DELPHI HARRISON V5
62-1

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Compressor
62
62-2
SCENIC Compressor
REMOVAL
Drain the R134a refrigerant circuit (refer to the
procedure described in the "Air conditioning" manual).
Disconnect the battery.
Remove:
– the cooling assembly (see section 19 ),
– the alternator (see section 16),
– the R134a refrigerant pipes retaining bolt,
– the four compressor mounting bolts.REFITTING
Refitting is the reverse of removal.
Tighten the R134a refrigerant pipes retaining bolt on
the compressor to 3 daN.m.
Fill the R134a refrigerant circuit using the filling
equipment.
IMPORTANT:
When replacing the existing compressor with a new
compressor, it is essential to drain some of the oil from
the new compressor, so that the amount of oil in the
new compressor corresponds to the amount of oil
drained from the oil compressor.
99211S
Oil drained
new
compressor=Oil
in the new
compressor-Oil remaining
in the old
compressor