ZEST/BOLT

ENGINE 1.3 QUADRAJET (75PS)

1. Connection lead

2. Protective sleeve

3. Planar sensor element

4. Ceramic support pipe

5. Sensor seat

6. Ceramic seal

7, Protective pipe

ELECTRICAL SPECIFICATIONS:

Max 7.5 V heater power supply from control unit

Heater resistance 3.2 ± 0.8 Ù

PIN OUT

1. Pumping current (lp)

2. Virtual mass

3. Heater (-)

4. Heater (+)

5. Calibration current

6. Nerst voltage

C. EXHAUST GAS RECIRCULATION (EGR).

This system makes it possible to send some (5 - 15%)

of the exhaust gases to the intake in certain operating

conditions.

This lowers the peak temperature in the combustion

chamber restricting the formation of nitrogen oxides

(NOx).

The E.G.R. solenoid valve (1) operated by the injection

control unit (2) carries out the t ask of reintroducing

some of the exhaust gases t aken from the exhaust

manifold (4) back into the engine intake.

A heat exchanger (3) allows the partial cooling of the

exhaust gases further lowering the temperature of

the combustion chamber.

1 - EGR solenoid

2 - Injection control unit

3 - Heat exchanger

4 - Exhaust manifold

5 - Air intake manifold

WORKING

At coolant temperatures of > 20°C with the engine

speed between 800 and 3000 rpm, the injection

control unit operates the E.G.R. solenoid valve with a

square wave signal.

The variation in this signal allows the E.G.R. coil to

move a shutter, thereby regulating the flow of exhaust

gases from the exhaust manifold to the int ake

manifold; there are two results: