Ford Sierra

3.1.4.4.1. Ignition system

THE GENERAL DATA

Design and functioning of system of ignition

Both types of engine DONS are equipped with electronic system of ignition:

  – Engines with carburettor fuel system: system of ignition ESC II;
  – Engines with injection: system of ignition ЕЕС IV.

System of ignition ESC II

The electric scheme of electronic system of ignition ESC of II carburettor engine DOHC 2,0 дм³

And – the electromagnetic valve of overlapping of giving of fuel after deenergizing of the engine, B – the generator, C – резисторный a heating element of the automatic starting arrangement of the carburettor, D – the switch of ignition, E – the module of management of ignition ESC II,

F – the gauge of temperature of a cooling liquid, G – the gauge of position and number of turns of a cranked shaft, H – the coil of ignition, J – the accumulator, K – a coding socket октанового fuel numbers

This system contains:

  – The distributor of ignition with the distributor of a high voltage and the contactless gauge of the Hall which are carrying out a role of the gauge of number of turns of a cranked shaft of the engine;
  – The ignition coil;
  – The vacuum gauge in an inlet collector;
  – The gauge of temperature of a cooling liquid;
  – The gauge of neutral position of the lever of a gear change of an automatic transmission (only in cars with an automatic transmission).

The electronic module of management of ignition ESC II receives signals from these gauges and on their basis and the data containing in its memory, selects optimum, for the given working conditions of the engine, the moment of interruption of a current in a primary winding of the coil of ignition, and thereby an optimum angle of an advancing of ignition. Then includes a current in a primary winding and interrupts a current in it during the moment when in the next cylinder there should be an ignition, again submits a current to this winding etc.

The corner of an advancing of ignition is constantly regulated according to received signals and the data containing in memory of the electronic module.

In engines with the carburettor the module of management of ignition ESC II corrects also position throttle заслонки in a no-load time depending on number of turns, loadings on the engine (for example, transfer inclusion in an automatic transmission or inclusion of the compressor of the conditioner), a thermal condition of the engine, and also from position throttle заслонки.

Check of elements of system of ignition ESC II

Checked element	Measurement between contacts	Ignition	Value	Remarks
Connection картера with weight	"16" and weight "3" and weight	It is switched off	0 – 0,5 Ohm
The proof-reader октанового fuel numbers	"7" and "16" "19" and "16"	It is switched off	Resistance infinitely big	Before check to disconnect module ESC II
The gauge of temperature of a cooling liquid	"10" and "22"	It is switched off	37 clod at 20 ° With 4 clod at 80 ° With
The electromagnetic valve демпфера the lever throttle заслонки	"24" and "4"	It is switched off It is included	Resistance infinitely big 65 – 80 Ohm	If is
The gauge of position of a cranked shaft	"5" and "18" "17" and "16"	It is included	300 – 500 Ohm Resistance infinitely big
Power supplies of module ESC II	"4" and "16"	It is included	10 – 14 IN

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The prevention

The method of check of elements of system of ignition of engine DOHC united with system of injection of fuel entering into control system of engine EES IV, is resulted in section of injection of fuel.

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System of ignition ЕЕС IV

This system of ignition functions on the same principle, as the system of ignition ESC II, only is united with fuel injection in the general control system of engine EES IV, and the electronic actuation device operates also injection system.

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The prevention

Described systems of ignition do not demand adjustment.

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Removal and installation of the distributor of ignition

Removal and installation of the distributor of ignition do not represent great difficulties. Elements of system of ignition of engine DOHC are represented in drawing.

Elements of system of ignition of engine DOHC

1 – a cover, the distributor, 2 – a rotor of the distributor, 3 – a plate, 4 – a lead, 5 – high voltage wires свеч ignitions, 6 – a spark plug, 7 – a wire of a high voltage of the coil of ignition, 8 – the coil of ignition, 9 – the electronic module of management of ignition

The ignition distributor can be established only in one, correct position.

Check of elements of system of ignition

In carburettor engine DOHC it is necessary to disconnect a multicontact socket of the module of management of ignition ESC II and to measure by means of a multimeter resistance and pressure on the chosen contacts of a socket according to the resulted table.

In case of wrong values of electric parametres before to consider the given element damaged, it is necessary to check up a condition of a corresponding electric contour.