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
         + 3.1.4.5. 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
            3.1.4.10.1. Technical characteristics
            3.1.4.10.2. Service and repair
            3.1.4.10.3. Adjustment of the emergency brake
            3.1.4.10.4. Removal of air from the brake system
            3.1.4.10.5. Anti-blocking system
            3.1.4.10.6. ABS functioning check
            3.1.4.10.7. Hydraulic knot of management
            3.1.4.10.8. Sensor of speed of rotation of wheels
         + 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





3.1.4.10.6. ABS functioning check

GENERAL INFORMATION

Functioning check

The electronic actuation device realizes also autodiagnostics function, warning the driver fire of a control bulb about emergence of malfunction of electric chains or elements of anti-blocking system. Besides, other control bulb informs the driver on pressure drop in hydraulic system.

Depending on type of the malfunction found by the electronic actuation device braking of the car can be normal (without ABS influence) or with limited action of ABS – adjustable braking only of back wheels.

For check of contours and elements of anti-blocking system it is necessary to connect a multimeter to the multicontact socket of the electronic actuation device of anti-blocking system and to execute the corresponding measurements.

Check of a hydraulic contour


Prevention

The hydraulic contour of anti-blocking system (ABS) of Teves is under high pressure. Therefore before all operations on check it is necessary to lower surely in it pressure. For this purpose it is necessary to switch off ignition and to press strongly about 20 times a brake pedal until it becomes "firm".


Check of pressure in pressure accumulator

PERFORMANCE ORDER
1. To lower pressure in pressure accumulator.
2. To remove pressure accumulator.
3. To connect the control manometer 12.009 together with a tee on the place of the accumulator of pressure.
4. To connect the hydraulic accumulator to a tee tip.
5. To include ignition.
6. To check whether pressure increases up to size of 4-9 MPas quickly. If pressure size other, then it is necessary to replace pressure accumulator.
7. To unhook cables from loops.
8. To lift the car.
9. Coupling guard.
10. The lower bolts of fastening of a case of coupling to the block of cylinders.

Diagnostics of the ABS Teves system

The checked element
Measurement between contacts
Value
Measurement conditions
Mass of the case of the electronic actuation device of the ABS system
"1" and weight
0 – 0,5 Ohms
Ignition is switched off
Mass of hydraulic knot
"11" and weight
0 – 0,5 Ohms
Ignition is switched off
Power supply tension
"1" and "2"
More than 10 V
Ignition is included
Main relay
"3" and "1"
"8" and "1"
"20" and "1"
0 – 0,5 Ohms
50 – 100 Ohms
0 – 0,5 Ohms
Ignition is included
Main electromagnetic valve
"18" and "11"
2 – 5 Ohms
Ignition is switched off
Electromagnetic inlet valve:
  – forward right;
  – forward left;
  – back
"15" and "11" "35" and "11" "17" and "11"
5 – 7 Ohms
5 – 7 Ohms
5 – 7 Ohms
Ignition is switched off
Electromagnetic final valve:
  – forward right;
  – forward left;
  – back
"34" and "11"
"16" and "11"
"33" and "11"
3 – 5 Ohms
3 – 5 Ohms
3 – 5 Ohms
Ignition is switched off
Sensor of level of brake fluid
"9" and "10"
0 – 0,5 Ohms
Ignition is switched off
Sensor of speed of rotation of a forward left wheel
"5" and "23"
0,8 – 1,4 Ohms
More than 0,5 In *
At voltage measurement ignition is switched off
Sensor of speed of rotation of a forward right wheel
"7" and "25"
0,8 – 1,4 Ohms
More than 0,5 In *
At voltage measurement ignition is switched off
Sensor of speed of rotation of a back left wheel
"6" and "24"
0,8 – 1,4 Ohms
More than 0,5 In *
At voltage measurement ignition is switched off
Sensor of speed of rotation of a back right wheel
"4" and "22"
0,8 – 1,4 Ohms
More than 0,5 In *
At voltage measurement ignition is switched off
Isolation of the sensor
Sensor and weight
More than 20 kOhm
Ignition is switched off
Control bulb
"27" and weight
0,5 – 1,5 B
Ignition is included

* To rotate a car wheel.


Prevention

For prevention of damage of contacts of the multicontact socket of the electronic actuation device of anti-blocking system connection of a transitional payment which contacts should be used for check of electric parameters in order that in the course of measurements not to use contacts of the socket of the electronic actuation device is recommended.


Check of time of accumulator charging of pressure

PERFORMANCE ORDER
1. To lower pressure in pressure accumulator.
2. To connect the manometer to pressure accumulator (see above).
3. To include ignition.
4. To check time of stabilizing of pressure up to the size of 4-9 MPas. This time has to be less than 60 seconds. If this condition is not satisfied, then it is necessary to check functioning of the pump, a condition of the filter in a tank of brake fluid, a condition of flexible pipelines of high pressure and tightness of connections of a tee.

Check of tightness of hydraulic knot

PERFORMANCE ORDER
1. To lower pressure in pressure accumulator.
2. To connect the manometer to pressure accumulator (see above).
3. To include ignition and to wait, so far pressure is not stabilized.
4. To switch off ignition.
5. To wait 5 minutes and to define pressure drop during this time. It should not exceed 1 MPa.

Check of tightness of a hydraulic contour

PERFORMANCE ORDER
1. To lower pressure in system.
2. To connect the manometer to pressure accumulator (see above).
3. To connect additional manometers to deaerators of both brake supports of forward wheels.
4. To include ignition.
5. To establish pressure of 10 MPas in a contour, pressing a brake pedal by means of special adaptation.
6. To define on manometers pressure drop in 5 minutes. It should not exceed:
      – on supports: 0,5 MPas;
      – on pressure accumulator: 1,0 MPas.
7. If it is more pressure drop, then it is necessary to check whether there were no smudges on connections of hydraulic pipelines, and in case of need to replace hydraulic knot of management.

Check of functioning of the sensor of pressure of the electric motor of the hydraulic pump

PERFORMANCE ORDER
1. To switch off ignition.
2. To lower pressure in hydraulic system.
3. To connect the manometer to pressure accumulator.
4. To include ignition.
5. To wait before switching off of the engine of the hydraulic pump.
6. To check pressure after a pump stop (as much as possible). This pressure has to make 17,4–18,8 MPas.
7. To press a brake pedal.
8. To determine pressure with which there is a turning on of the electric motor of the hydraulic pump. This pressure has to make 13–15 MPas. In case of non-performance of this condition it is necessary to replace the sensor of pressure of the electric motor of the hydraulic pump.