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FUNCTION : RECYCLING OF EXHAUST GASES

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 B0F2X AND DVY01 AND SINCE O 8688 OR

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

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

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 flowmeter (1310)(1310)

2.1 - Role.

The air flowmeter measures the flow of fresh air taken in by the engine.

Role of the injection ECU according to the data received :

To calculate the exhaust gas recycling rate.
To limit smoke production during the transitional phases (acceleration, deceleration) by correcting the fuel flow.

2.2 - Description.

Fig : B1HP115D

(19) electrical connector.

(20) protective grille.

(21) metallic plate (hot film).

(22) air temperature sensor.
The air flowmeter consists of the following components :
Metallic plate (hot film).
Air temperature sensor.

The metallic plate is very thin and allows the amount of air entering the air circuit to be calculated.
The metallic plate consists of the following components :
Heating resistor.
Measurement resistor (NTC).

The injection ECU supplies the heating resistor in order to keep the metallic plate at a fixed temperature.

The air passing through the flowmeter cools the metallic plate:the measurement resistor (NTC) varies.

The ECU relates the measurement resistor value to the air flow.

IMPORTANT : Do not touch the metallic plate; the use of an air nozzle is forbidden.

2.3 - Electrical features.
Allocation of the connector channels :
Channel 1:Air temperature information.
Channel 2:+12 volts supply.
Channel 3:Earth.
Channel 4:Line unused.
Channel 5:Air flow data.
Channel 6:Earth.

2.4 - Location.

The air flow meter is located between the air filter and the turbocharger.

3 - Vacuum pump
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).

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

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

4.1 - 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).

4.2 - Description.

The electrovalve links the vacuum pump and the exhaust gas recycling valve capsule.

Fig : B1HP116C

(23) electrical connector.

A:"user" outlet.

B:pressure drop inlet for the vacuum pump.

C:white marking.

D: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.

4.3 - Electrical features.

Control:injection ECU (earth).
Variable voltage control (OCR) :
Full supply (maximum OCR)=Maximum vacuum.
No supply (minimum OCR)=No vacuum (atmospheric pressure).
Resistance at 25 °C=5 ohms.

NOTE : OCR : Open Cycle Ratio.

4.4 - Location.

Fig : B1HP117C

(2) boost pressure regulation electrovalve.

The electrovalve is located in the engine compartment.

5 - Exhaust gas recycling valve (EGR)

5.1 - Role.

The exhaust gas recycling valve checks the amount of exhaust gas that is recycled.

The exhaust gas recycling (EGR) device reduces the amount of nitrogen oxide (NOx) emitted by the exhaust.

The reduction of the nitrogen oxide is achieved by re-injecting part of the exhaust gas into the cylinders.

The recycling phases are memorized in injection ECU mapping.

5.2 - Description.

Fig : B1KP00PC

E:vacuum inlet (gas recycling regulation electrovalve).

F:pneumatic control capsule for the EGR valve.

(5) exhaust gas recycling valve (EGR).

WARNING : The gas recycling valve is shut when it is not being pneumatically controlled (vacuum).
Operating phases when the pneumatic control capsule is supplied with a vacuum :
The gas recycling valve opens.
Part of the exhaust gas is absorbed by the engine (air inlet manifold).

5.3 - Location.

The recycling valve is mounted on the exhaust manifold.

6 - Catalytic converter

The catalytic converter is a 2-way type catalytic converter.
The catalytic converter (located on the exhaust line) enables the reduction of output into the atmosphere of the following components :
Carbon monoxide (CO).
Non-burned hydrocarbons (HC).

Post-injection combined with a nitrogen oxide catalytic converter can reduce the quantity of nitrogen oxide as well as other pollutants (4-way catalytic converter).