INTRODUCTION - ENGINE AIR SUPPLY CIRCUIT

2.0 JTS

CONSTRUCTION SPECIFICATIONS

The air intake circuit consists of the various components that ensure the correct direction and filtering of the air flow rate required for the volumetric filling of the cylinders in all engine operating conditions.

1.9 JTD 16V

COMPOSITION

STRUCTURE

AIR SUPPLY SYSTEM

1 - Air filter complete with resonator

2 - Flow meter

3 - Corrugated hose

4 - Turbocharger

5 - Air/air heat exchanger (intercooler)

6 - Throttle body

7 - Throttle casing control actuator

8 - Intake chamber

9 - Hose with resonator

DESCRIPTION OF COMPONENTS

THROTTLE BODY

Construction specifications

In order to limit the shuddering of the engine whilst it is switching off, a throttle casing has been introduced downstream of the air chamber which has the task of closing the flow of air to the cylinders.

The throttle remains open in all other operating conditions.

1 - Vacuum reservoir

2 - Solenoid

3 - Throttle casing control actuator

4 - Throttle body

5 - Injection control unit

Operation

When the engine is off, the throttle is open because no vacuum is present.

When the engine is running, the throttle is open because the deactivated solenoid valve closes off the flow of the vacuum to the throttle casing pneumatic actuator.

A vacuum builds up during engine operation.

When the engine is turned off (the key is turned OFF), the injection control unit keeps the actuator supply relay supplied 4 or 5 seconds longer and simultaneously earths the solenoid valve. The valve then opens to send a vacuum to the pneumatic actuator which closes the throttle to cut off the air flow to the cylinders.

1.8 T.SPARK

CONSTRUCTION SPECIFICATIONS

The air intake circuit consists of the various components that ensure the correct direction of the air flow rate required for the volumetric filling of the cylinders in all engine operating conditions.