Ford Sierra

1982-1993 of release

Repair and operation of the car



Ford Siyerra
+ 1.2. Identification of the car
+ 2. Maintenance
- 3. General data
   - 3.1. Cars with petrol engines
      3.1.1. Masses and transfer numbers
      3.1.2. Operational liquids
      + 3.1.3. Changes in a car design from 1984 to 1986.
      - 3.1.4. Changes in a car design from 1987 to 1989.
         3.1.4.1. OHC engine
         + 3.1.4.2. Dm3 CVH 1,8 engine
         + 3.1.4.3. DOHC engine
         - 3.1.4.4. Service and repair
            3.1.4.4.1. System of ignition
            3.1.4.4.2. System of injection
            3.1.4.4.3. Scheme of the EES IV system of the DOHC 2,0 engine of dm3
            3.1.4.4.4. Check and adjustment of the EEC IV system
            3.1.4.4.5. Elimination of malfunctions
            3.1.4.4.6. Check of elements of the EEC IV system
            3.1.4.4.7. System of gas distribution
            3.1.4.4.8. Head of the block of cylinders of the engine
            3.1.4.4.9. Dismantling of the engine
            3.1.4.4.10. Assembly of the engine
            3.1.4.4.11. Lubrication system
         + 3.1.4.5. Coupling
         3.1.4.6. Mechanical five-speed transmission of N type
         + 3.1.4.7. Mechanical MT 75 five-speed transmission
         3.1.4.8. Automatic transmission
         3.1.4.9. Forward suspension bracket
         + 3.1.4.10. Brake system
         + 3.1.4.11. Electric equipment
         3.1.4.12. General data
      + 3.1.5. Changes in a car design from 1990 to February, 1993.
   + 3.2. Cars with diesel engines
+ 4. Engines
+ 5. Coupling
+ 6. Transmissions
+ 7. Driveshaft and back bridge
+ 8. Steering
+ 9. Suspension brackets
+ 10. Brake system
+ 11. Body
+ 12. Electric equipment





3.1.4.4. Service and repair

3.1.4.4.1. System of ignition

GENERAL INFORMATION

Design and functioning of system of ignition

Both types of the DOHC engine are equipped with electronic system of ignition:

  – engines with carburetor fuel system: system of ignition of ESC II;
  – engines with injection: system of ignition of EEC IV.

System of ignition of ESC II

Electric circuit of electronic system of ignition of ESC II of the carburetor DOHC 2,0 engine of dm3

And – the electromagnetic valve of blocking of supply of fuel after switching off of the engine,
B – generator,
C – resistor heating element of the automatic starting arrangement of the carburetor,
D – ignition switch,
E – module of management of ESC II ignition,
F – sensor of temperature of cooling liquid,
G – sensor of situation and speed of a bent shaft,
H – ignition coil,
J – accumulator,
K – I will corrode codings of octane number of fuel

This system contains:

  – the ignition distributor with the distributor of high voltage and the contactless sensor of Hall which is carrying out a role of the sensor of speed of a bent shaft of the engine;
  – ignition coil;
  – the vacuum sensor in an inlet collector;
  – sensor of temperature of cooling liquid;
  – the sensor of neutral position of the lever of gear shifting of the automatic transmission (only in cars with the automatic transmission).

The electronic module of management of ignition of ESC II receives signals from these sensors and on their basis and data which are contained in his memory selects optimum, for these operating conditions of the engine, the moment of interruption of current in primary winding of the coil of ignition, and thereby an optimum angle of an advancing of ignition. Then includes current in primary winding and interrupts current in it at the moment when in the next cylinder there has to be ignition, again gives current to this winding, etc.

The corner of an advancing of ignition is constantly regulated according to the obtained signals and data which are contained in memory of the electronic module.

In engines with the carburetor the module of management of ignition of ESC II corrects also the provision of a butterfly valve in no-load time depending on speed, load of the engine (for example, inclusion of transfer in the automatic transmission or turning on of the compressor of the conditioner), a thermal condition of the engine, and also from the provision of a butterfly valve.

Check of elements of system of ignition of ESC II


The checked element
Measurement between contacts
Ignition
Value
Remarks
Connection of a case with weight
"16" and weight
"3" and weight
It is switched off
0 – 0,5 Ohms
 
Proofreader of octane number of fuel
"7" and "16"
"19" and "16"
It is switched off
Resistance infinitely big
Before check to disconnect the ESC II module
Sensor of temperature of cooling liquid
"10" and "22"
It is switched off
37 kOhm at 20 °C
4 kOhm at 80 °C
 
Electromagnetic valve of a damper of the lever of a butterfly valve
"24" and "4"
It is switched off


It is included
Resistance infinitely big

65 – 80 Ohms
If is
Sensor of provision of a bent shaft
"5" and "18"
"17" and "16"
It is included
300 – 500 Ohms
Resistance infinitely big
 
Power supply of the ESC II module
"4" and "16"
It is included
10 – 14 V
 

Prevention

The method of check of elements of system of ignition of the DOHC engine integrated with system of injection of fuel entering a control system of the EEC IV engine, is given in the section of injection of fuel.


System of ignition of EEC IV

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

The described systems of ignition do not demand adjustment.


Removal and installation of the distributor of ignition

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

Elements of system of ignition of the DOHC engine

1 – cover, distributor,

2 – distributor rotor,

3 – plate,

4 – lead,

5 – wires of high voltage of spark plugs,

6 – spark plug,

7 – wire of high voltage of the coil of ignition,

8 – ignition coil,

9 – electronic module of management of ignition


The distributor of ignition can be installed only in one, correct situation.

Check of elements of system of ignition

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

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