FUNCTION : AIR SUPPLY CIRCUIT

FOR 1CU6 AND B0F7C AND DVY01 AND SINCE O 8276 OR

FOR 2CM4 AND B0F2X AND DVY01 AND SINCE O 8358 OR

FOR 1C6N AND B0F2X AND DVY01 AND SINCE O 8365 OR

FOR 2CU6 AND B0F7C AND DVY01 AND SINCE O 8421 OR

FOR 2CU6 AND B0F7U AND DVY01 AND SINCE O 8421 OR

FOR 1C2X AND B0F7C AND DVY01 AND SINCE O 8001 OR

FOR 1CN6 AND B0F2X AND DVY01 AND SINCE O 8211 TO O 8687 OR

FOR 1CN7 AND B0F2X AND DVY01 AND SINCE O 8688 OR

FOR 1CX4 AND B0F7C AND DVY01 AND SINCE O 8688 OR

FOR 1CX4 AND B0F2X AND DVY01 AND SINCE O 8688

1 - Synopsis

Fig : B1HP10YP

Air circulation (as per arrows) :

• A:Air.
• B:Exhaust gas + Air.
• C:Exhaust gas.
  
  WARNING : The diagram relates to engines with a controlled turbo (injection ECU + electrovalve).
  

  Marked	Description	Part number in the electrical diagrams	Remarks
  1	Injection ECU	1320
  2	Recycling regulation electrovalve (EGR)	1253
  3	Vacuum pump
  4	Boost pressure regulation electrovalve	1233	According to model
  5	Exhaust gas recycling valve (EGR)
  6	Air inlet manifold
  7	Exhaust gas manifold
  8	Boost pressure waste gate		Vacuum-controlled
  9	Pneumatic control capsule for the waste gate (on turbocharger)		Vacuum-controlled
  10	Catalytic converter
  11	Exhaust turbine
  12	Turbocharger
  13	Air inlet turbine
  14	Air flowmeter + air temperature sensor	1310
  15	Air filter
  16	Inlet manifold pressure sensor	1312
  17	Air/air heat exchanger		According to model
  18	Atmospheric pressure sensor (integrated in the injection ECU)	1320

  
  NOTE : EGR : exhaust gas recycling device.
  

  2 - Air filter
  

  Replacement intervals:every 60 000 km.

  3 - Turbocharger
  

  3.1 - Role.
  

  The turbocharger allows the engine to be turbocharged with air.

  There are 2 assembly possibilities :
• Boost pressure controlled by the injection ECU and the electrovalve.
• Boost pressure regulated by the waste gate only.
  

  3.2 - Description.
  

  Fig : B1HP10ZD

  D:non-controlled turbocharger.

  E:controlled turbocharger (injection ECU + electrovalve).

  A:to the inlet manifold.

  B:gas from the exhaust manifold.

  (1) injection ECU.

  (3) vacuum pump.

  (4) boost pressure regulation electrovalve.

  (8) boost pressure waste gate.

  (9) pneumatic control capsule for the waste gate :vacuum-controlled.

  (11) exhaust turbine.

  (13) air inlet turbine.

  (19) pneumatic control capsule for the waste gate :pressure-controlled.

  The turbocharger is made of two separate chambers.

  The turbocharger consists of the following components :
• A chamber connected to the engine exhaust function.
• A chamber connected to the inlet function.
• A turbine and a compressor, connected by a shaft.
  

  The turbine, activated by the exhaust gas, drives the compressor which compresses the inlet air.

  
  NOTE : Turbocharger lubrication:the very high speeds of the moving parts and temperatures demand a careful lubrication.
  

  The required oil under pressure is taken from the engine oil circuit.

  
  

  IMPORTANT : Before stopping the engine, it is essential to allow the engine to return to idle.failure to observe this condition may cause the destruction of the turbocharger (lack of lubrication).

  
  

  The turbocharge pressure is regulated by the waste gate valve.

  The boost pressure can be regulated in 2 ways :
• D assembly:At rest the waste gate is closed.
• E assembly:At rest the waste gate is open.
  

  3.2.1 - D assembly.
  

  The boost pressure is regulated according to the air pressure in the inlet manifold.

  Operating phases once the pressure value of the pneumatic capsule (19) has been exceeded :
• The boost pressure waste gate opens.
• The exhaust turbine speed decreases.
• The boost air pressure decreases.
  

  The decrease in the boost pressure causes the boost pressure waste gate to close.

  3.2.2 - E assembly.
  

  The boost pressure is regulated by the electrovalve (4) controlled by the injection ECU (1).

  
  WARNING : The waste gate is open when it is not being pneumatically controlled (vacuum).
  

  The increase in pressure in the inlet manifold is obtained by closing the waste gate.

  Operating phases once the injection ECU prevents operation of the electrovalve (4) in order to limit the boost pressure :
• The vacuum pump no longer communicates with the pneumatic control capsule (9).
• The boost pressure waste gate opens.
• The exhaust turbine speed decreases.
• The boost air pressure decreases.
  

  4 - Atmospheric pressure sensor (1320)1320
  

  4.1 - Role.
  

  The sensor measures the atmospheric pressure.

  Role of the injection ECU according to the data received :
• To determine the air density.
• To prevent recycling when driving at high altitude.
  
  NOTE : Air density decreases as altitude increases.
  

  4.2 - Description.
  

  The sensor is of the piezoelectrical type.

  The sensor consists of stress gauges.

  The sensor supplies a voltage proportional to the atmospheric pressure.

  4.3 - Location.
  

  Fig : B1HP110C

  The atmospheric pressure sensor (18) is integrated in the injection ECU.

  
  WARNING : The atmospheric pressure sensor can not be separated from the injection ECU.
  

  5 - Air/air heat exchanger
  

  5.1 - Role.
  

  The air/air heat exchanger cools the air entering the cylinders in order to increase the air density within the cylinders.

  Due to the increase of the air density, the motor's performances increase.

  5.2 - Location.
  

  Location:on the front panel of the vehicle.

  6 - Inlet manifold pressure sensor (1312)1312
  

  6.1 - Role.
  

  The sensor enables to determinate the air pressure in the intake pipe.

  Role of the injection ECU according to the data received :
• Regulate the boost pressure (*).
• Regulate the HP fuel pressure.
• Regulate the duration of injection (fuel flow).
  

  (*) controlled turbocharger (injection ECU + electrovalve).

  6.2 - Description.
  

  Fig : B1HP111C

  C:air intake.

  The sensor is connected to the inlet air circuit at the air/air heat exchanger.

  The sensor is of the piezoelectrical type.

  The sensor consists of stress gauges.

  The pressure sensor supplies a voltage proportional to the air pressure in the inlet manifold.

  6.3 - Electrical features.
  

  Allocation of the connector channels :
• Channel 1:5 volts.
• Channel 2:Earth.
• Channel 3:Signal.
  

  Pressure of 1,3 bar=output voltage of 1 volt.

  7 - Vacuum pump
  

  7.1 - Role.
  

  The vacuum pump supplies the vacuum required to control the following components :
• Exhaust gas recycling valve (EGR) (depending on the version).
• Pneumatic control capsule for the EGR valve.
• Brake servo (depending on the version).
  

  7.2 - Description.
  

  The vane-type vacuum pump is driven by the engine camshaft.

  Fig : B1HP112C

  (3) vacuum pump.

  (20) safety valve (the valve is integrated in the outlet union).

  A safety valve integrated in the pump isolates the brake vacuum circuit with the engine switched off.

  The safety valve allows the following to be retained :
• A vacuum reserve in the brake servo.
• Braking assistance for several applications of the brake.
  

  7.3 - Location.
  

  Location:on the cylinder head at the end of the camshaft, gearbox side.

  8 - Boost pressure regulation electrovalve (1233)(1233)
  

  Vehicle application:vehicles with boost pressure controlled by the injection ECU.

  8.1 - Role.
  

  The regulating electrovalve controls the boost pressure waste gate.

  Role of the boost pressure regulating electrovalve :
• Regulate the boost pressure.
• To limit the boost pressure.
  

  Regulation of the boost pressure is progressive and is controlled by mapping (injection ECU).

  8.2 - Description.
  

  Fig : B1HP113C

  (21) electrical connector.

  D:"user" outlet.

  E:pressure drop inlet for the vacuum pump.

  F:white marking.

  G:atmospheric pressure inlet.

  The electrovalve control is of the OCR type (open cycle ratio).

  The proportional electrovalve controlled by an OCR voltage is connected to the following components :
• Atmospheric pressure.
• Vacuum supplied by the vacuum pump.
  

  The pressure supplied by the electrovalve is included between the atmospheric pressure and the vacuum pump vacuum.

  8.3 - Electrical features.
  

  Control:injection ECU (earth).

  Variable voltage control (OCR) :
• Full supply (maximum OCR)=Maximum vacuum.
• No supply (minimum OCR)=No vacuum (atmospheric pressure).
  
  NOTE : OCR : Open Cycle Ratio.
  

  8.4 - Location.
  

  Fig : B1HP114C

  (4) boost pressure regulation electrovalve.

  The electrovalve is located in the engine compartment.