Audi A4, S4

since 2000 of release

Repair and car operation

Ignition and engine management system

Main data and security measures

The system of ignition develops sparks which make firing soaked up fuel - an air mix. For this purpose in ignition coils tension 12 In will be transformed to tension of 30.000 Century.

At petrol engines with electronic ignition the control unit defines the ignition moment on the basis of the characteristic which was stored in his memory of ignition. Synchronization of work of system of ignition is carried out by signals which arrive in the control unit from the sensor of the Hall or the pulse sensor. Existence of anti-detonation regulation provides profitability of operation of the engine at high extent of compression and compensation of distinction of characteristics of quality of fuel. The detonation sensor on the block of cylinders registers emergence of a detonation at combustion of fuel and initiates the control unit the engine to displace ignition in the direction "late". Thus soft operation of the engine and absence of its damage is provided with a detonation. Some engines have two detonation sensors on the block of cylinders.

Coil ignition/spark plug. Engine of 2.0 l of ALT

1 — the Screw 2 — Shtekernaya a level 3 — the Connecting tip 4 — the ignition Coil with a target step 5 — the Spark plug, 30Нм 6 — the Connecting tip 7 — the Bolt, 10Нм 8 — the Hall Sensor 9 — the Bolt, 25Нм 10 — the Washer, conic 11 — the Cover of the sensor of the Hall. At installation pay attention to fixing. 12 — the Sensor of a detonation 1 13 — the Sensor of a detonation 2

14 — the Screw, 20Нм. Precisely observe the tightening moment since it influences operation of the sensor of a detonation. 15 — the Socket three-contact green color of the sensor of a detonation 1. Fastens on a forward wall of an impellent compartment at the left in the movement direction, under a broad tank 16 — the Socket three-contact green color of the sensor of a detonation 2. Fastens on a forward wall of an impellent compartment at the left in the movement direction, under a broad tank

Direct ignition

Distribution of a current of ignition on candles the block of electronic control operates.

Petrol engines 1.6 and 2.4 of l have 2 or 3 coils of ignition located in one case with a target step on a head of cylinders. Each coil of ignition submits tension on 2 spark plugs. For some engines are available 4, 6 or 8 coils of ignition located directly on spark plugs. In this case the cable of ignition is absent.

External adjustment of the moment of ignition is not made. If the moment of ignition deviates a preset value, it is necessary to replace the damaged elements.

The system of ignition does not wear out and does not demand service. According to the schedule of maintenance it is required to replace spark plugs only.

The main data on work and sensors of control systems and injection are stated in the Section Functioning of a control system and injection of the petrol engine.

Security measures at work with ignition and injection system

For an exception of a travmirovaniye of people and/or system damage впрыскаи the following is necessary to observe ignitions:

Do not concern and do not disconnect an ignition wire at the working engine or at the included starter. Disconnect and attach pipelines of system of injection and an ignition wire, and also electric wires of devices of measurement only at the switched-off ignition. Do not allow to work with electronic system of ignition to people with a warm stimulator. It is impossible to close the plug of 1 coils of ignition on weight. At an engine provorachivaniye a starter, for example, at check of pressure of a compression switch off ignition and disunite the socket of the sensor of provision of a cranked shaft. Do not attach a control lamp to the plug of 1 coils of ignition.