diagnosis and repair of air-conditioning

A/C control: manual / automatic

115 cv 1.6 BlueHDi motor: BHX

under the bonnet

in the cabin

BCP3 3-relays box, under the bonnet.

BSI cabin comfort C. U..

1032 cartridge fuses additional box / battery.

PSF1 fuse and relay box / motor.

0004 centre display.

1220 motor temperature sensor.

1320 engine control unit - ECU.

1510 motoventilator of the engine coolant circuit.

1522 relay of the engine coolant motor-driven fan.

8006 temperature sensor of the evaporator.

8007 A/C refrigerant high pressure HP sensor.

8020 A/C compressor.

8033 sunlight sensor.

8045 cabin blower control module.

8050 cabin blower.

8063 air mix motor / right side.

8064 air mix motor / left side.

8070 air recirculation motor.

8071 air distribution flap servomotor -> central.

8073 air distribution flap servomotor -> feet / defrost.

8080 A/C control unit.

8084 heating resistances of the auxiliary heater.

84C6 A/C control interface.

MC10 earth wing shield at the front/left side of the motor compartment.

MC13 earth wheel arch / left side.

MC45/MC46 earth door frame / on the driver side.

MC47 earth / foot of the door pillar / central / left side.

MC51 earth.

  • Below of -> the center console.
According to the versions :

* petrol engine.

** diesel engine.

pressures/temperature

general instruction

The outside temperature must exceed 15°C.

Cabin filter in perfect shape (if fitted).

Connect the inspection equipment to the high and low pressure couplings.

If not, reload the cooling circuit with the proper gas quantity.

No one should stay inside the vehicle during the controlling process.

vehicle test conditions

Doors closed, windows avant open.

Motor bonnet closed.

Hot engine (after one engagement of the motor-driven fan).

A-C running.

A-C controls position

Air distribution : all air vents at maxi opening.

Regulation : automatic position.

Cabin air distribution : recirculation.

Air temperature in the cabin : maximum cold.

Blower speed : maxi.

checking

Keep the engine speed at 2000 rpm.

Read the pressures as soon as stabilization occurs.

The readings should be in line with the reference values.

outside temperature (°C) input pressure of the compressor (LP) bar compressor output pressure (HP) bar
20,00 2,00 ±0,10 10,60 ±4,10

Connector

Motor compartment fuses box

fuse and relay box

Sight on the box :

PSF1 27 pins connector.

  • NR black colored.
  • BE blue colored.
  • MR brown colored.

fuse and relay box

PSF1 6 pins connector NR black colored.

fuse and relay box

A/C Control Unit

A/C control unit

40 pins connector.

  • Blue BE colored.

A/C control unit

6 pins connector.

  • Black NR colored.

A/C control unit

Cabin fuses box

fuse and relay box

BSI fuse and relay box cabin.

BSI 16 pins connector VE green colored.

fuse and relay box

BSI 16 pins connector NR black colored.

fuse and relay box

BSI 16 pins connector GR grey colored.

fuse and relay box

BSI 35 pins connector NR black colored.

fuse and relay box

BSI 60 pins connector.

  • Black NR colored.
  • Brown MR colored.
  • Blue BE colored.
  • Yellow colored JN.

fuse and relay box

Engine control unit - ECU

connector

70 pins connector.

connector

120 pins connector.

Checking

Air distribution flap servomotor

6 pins connector

air distribution flap servomotors

The system uses distribution motors of the type.

  • Stepper.

The group of the air distribution motors is monitored in parallel by the A/C C. U..

The 2 stepper coils with pole reversal are supplied by a joint power supply.

checking process

Features :
Component resistance :
  • Channels : 1 3 reading 165 +/- 6 Ohm.
  • Channels : 4 6 reading 165 +/- 6 Ohm.
Feed system :

Activate the air distribution motors through the A/C control panel in the cabin.

Disconnect the connector.

1 phase :
  • Channels : 1 12 V +/- 1 V.
  • Channels : 3 12 V +/- 1 V.
2 phase :
  • Channels : 4 12 V +/- 1 V.
  • Channels : 6 12 V +/- 1 V.
Feed system :
  • Channels : 2 12 V +/- 1 V.
  • Channels : 5 according to the versions - 0V.
  • Channels : 5 absent / according to the versions.
Use a diagnosis equipment :
  • Actuators checking.
  • Parameters checking.

Cabin blower control module

6 pins connector

workings & design

Rear air conditioning :

The distribution of the regulation among four zones offers full choice to the rear passengers.

The modul 8045 / 80A6 receives from the A/C unit 8080 a variable voltage, which varies according to the requested motorfan speed.

This rectangular signal is built as a % variable duty cycle; the cycle variation represents the rotational speed regulation of the cabin blower (fresh air).

cabin blower control module

1 cabin blower control -.

2 cabin blower control +.

3 feed system cabin blower control module +12v.

4 feedback signal of the fan speed.

5 pulsated modulated signal cabin blower control %.

6 earth.

checking process

Use a diagnosis equipment :
  • Actuators checking.
  • Parameters checking.
Signal check :
  • Pulsated modulated signal %.
  • Channels : 6 5.
  • Feedback signal of the fan speed %.
  • Channels : 6 4.

Air recirculation motor

6 pins connector

air distribution flap servomotors

The system uses distribution motors of the type.

  • Stepper.

The group of the air distribution motors is monitored in parallel by the A/C C. U..

The 2 stepper coils with pole reversal are supplied by a joint power supply.

checking process

Features :
Component resistance :
  • Channels : 1 3 reading 165 +/- 6 Ohm.
  • Channels : 4 6 reading 165 +/- 6 Ohm.
Feed system :

Activate the air distribution motors through the A/C control panel in the cabin.

Disconnect the connector.

1 phase :
  • Channels : 1 12 V +/- 1 V.
  • Channels : 3 12 V +/- 1 V.
2 phase :
  • Channels : 4 12 V +/- 1 V.
  • Channels : 6 12 V +/- 1 V.
Feed system :
  • Channels : 2 12 V +/- 1 V.
  • Channels : 5 according to the versions - 0V.
  • Channels : 5 absent / according to the versions.
Use a diagnosis equipment :
  • Actuators checking.
  • Parameters checking.

Temperature sensor of the evaporator

2 pins connector

workings & design

This is a NTC sensor (negative temperature coefficient); as the temperature increases, the more its resistance decreases.

checking process

Use a diagnosis equipment :
  • Parameters checking.
Voltage :
  • Supply voltage : 0 5 volts.
Component resistance KOhm :
  • Resistor : 9 +/- 2% at 0 °C.
  • Resistor : 5,48 +/- 2% at 10 °C.
  • Resistor : 3,44 +/- 2% at 20 °C.
  • Resistor : 2,22 +/- 2% at 30 °C.
  • Resistor : 1,46 +/- 2% at 40 °C.

Sunlight sensor

2 pins connector

workings & design

A light sensor is on the dashboard close to the windscreen. The signal changes according to the occultation or the lighting of the sunlight sensor.

It allows to dampen the reading when the lighting rate is weak (tunnel, woods area, driving by night) and to reinforce the reading when the lighting rate is stronger.

1 sunlight sensor signal mA.

2 earth.

sensor checking

Use a diagnosis equipment :
  • Parameters checking.
Sensor checking :
  • Illuminate the sensor with a lamp, and read the amperage on the channels 2 -.
Signal check :
  • A - Ampere 0,7 -> 0,9 A.
Keep the sensor in the dark :
  • Sunlight sensor signal < 0,1 A.
Test the power supply :

Insulation test - to earth - for the socket pins.

Insulation test - to + - for the socket pins.

Air mix motor

6 pins connector

air distribution flap servomotors

The system uses distribution motors of the type.

  • Stepper.

The group of the air distribution motors is monitored in parallel by the A/C C. U..

The 2 stepper coils with pole reversal are supplied by a joint power supply.

checking process

Features :
Component resistance :
  • Channels : 1 3 reading 165 +/- 6 Ohm.
  • Channels : 4 6 reading 165 +/- 6 Ohm.
Feed system :

Activate the air distribution motors through the A/C control panel in the cabin.

Disconnect the connector.

1 phase :
  • Channels : 1 12 V +/- 1 V.
  • Channels : 3 12 V +/- 1 V.
2 phase :
  • Channels : 4 12 V +/- 1 V.
  • Channels : 6 12 V +/- 1 V.
Feed system :
  • Channels : 2 12 V +/- 1 V.
  • Channels : 5 according to the versions - 0V.
  • Channels : 5 absent / according to the versions.
Use a diagnosis equipment :
  • Actuators checking.
  • Parameters checking.

A/C refrigerant high pressure HP sensor

3 pins connector

workings & design

The linear pressure sensor (piezo electric) measures the cooling fluid pressure.

It differs from the 3-ways pressure switch by delivering a linear signal.

The pressure sensor data are transferred to the injection C. U..

The information is transferred via multiplex link to the cabin C.U. (BSI).

1 earth.

2 linear voltage signal : 0,5 4,5 volts.

3 supply voltage : 5 volts.

sensor checking

Use a diagnosis equipment :
  • Parameters checking.
Voltage :
  • Supply voltage : 5 volts.
Signal of the pressure sensor :

Linear voltage signal : 0,5 +/- 0,1 volts 1 bar.

Linear voltage signal : 1,6 +/- 0,3 volts 10 bars.

Linear voltage signal : 2,5 +/- 0,3 volts 15 bars.

Linear voltage signal : 4,5 +/- 0,3 volts 31 bars.

External control solenoid valve of the A/C compressor

2 pins connector

workings & design

The solenoid control valve is electically piloted by the A/C C. U..

It receives a control signal which allows to force a differential pressure level in line with a swash plate position, that is to say with a clearly defined cold output of the compressor.

The control is achieved through a pulsated modulated current . The cubic capacity will result from the duty cycle of this signal.

The solenoid valve signal changes according to the evaporator exit temperature and to the pressure in the HP circuit.

  • 0 % = minimal cubic capacity.
  • 100 % = maximal cubic capacity.

checking process

Use a diagnosis equipment :
  • Parameters checking.
Features channels : 1 2:
  • Resistor : 11 +/- 2 Ohm at 20 °C.
  • Supply voltage : 12 volts.


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Diagnostic, réparation mécanique et carrosserie, entretien
Ref 25TISN3

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