Ford Sierra

1982-1993 of release

Repair and car operation



Ford Siyerra
+ 1.2. Car identification
+ 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 type N
         + 3.1.4.7. Mechanical five-speed transmission of MT 75 type
         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 hand brake
            3.1.4.10.4. Air removal from brake system
            3.1.4.10.5. Anti-blocking system
            3.1.4.10.6. Check of functioning of ABS
            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 with 1990 till 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. Check of functioning of ABS

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 of only 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) Teves is under a high pressure. Therefore before the beginning of all operations on check it is necessary to lower surely in it pressure. For this purpose it is necessary to switch off ignition and strongly to press about 20 times a brake pedal while it does not become "firm".


Pressure check in the pressure accumulator

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

ABS Teves system diagnostics

Checked element
Measurement between contacts
Value
Measurement conditions
Mass of the case of the electronic actuation device of ABS system
"1" and weight
0–0,5 Ohm
Ignition is switched off
Mass of hydraulic knot
"11" and weight
0–0,5 Ohm
Ignition is switched off
Tension of power supply
"1" and "2"
More than 10 In
Ignition is included
Main relay
"3" and "1"
"8" and "1"
"20" and "1"
0–0,5 Ohm
50-100 Ohm
0–0,5 Ohm
Ignition is included
Main electromagnetic valve
"18" and "11"
2–5 Ohm
Ignition is switched off
Electromagnetic inlet valve:
  – the forward right;
  – the forward left;
  – the back
"15" and "11" "35" and "11" "17" and "11"
5–7 Ohm
5–7 Ohm
5–7 Ohm
Ignition is switched off
Electromagnetic final valve:
  – the forward right;
  – the forward left;
  – the back
"34" and "11"
"16" and "11"
"33" and "11"
3–5 Ohm
3–5 Ohm
3–5 Ohm
Ignition is switched off
Sensor of level of brake liquid
"9" and "10"
0–0,5 Ohm
Ignition is switched off
Sensor of speed of rotation of a forward left wheel
"5" and "23"
0,8-1,4 Ohm
More than 0,5 In *
At tension measurement ignition is switched off
Sensor of speed of rotation of a forward right wheel
"7" and "25"
0,8-1,4 Ohm
More than 0,5 In *
At tension measurement ignition is switched off
Sensor of speed of rotation of a back left wheel
"6" and "24"
0,8-1,4 Ohm
More than 0,5 In *
At tension measurement ignition is switched off
Sensor of speed of rotation of a back right wheel
"4" and "22"
0,8-1,4 Ohm
More than 0,5 In *
At tension measurement ignition is switched off
Sensor isolation
Sensor and weight
More than 20 kiloohms
Ignition is switched off
Control bulb
"27" and weight
0,5-1,5 In
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 the transitional payment which contacts should be used for check of electric parameters is recommended in order that in the course of measurements not to use contacts of the socket of the electronic actuation device.


Check of time of a battery charging of pressure

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

Check of tightness of hydraulic knot

PERFORMANCE ORDER
1. To lower pressure in the pressure accumulator.
2. To connect a manometer to the pressure accumulator (see above).
3. To include ignition and to wait, while pressure is not stabilized.
4. To switch off ignition.
5. To wait for 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 a manometer to the pressure accumulator (see above).
3. To connect additional manometers to deaerator 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 the special adaptation.
6. To define on manometers pressure drop in 5 minutes. It should not exceed:
      – on supports: 0,5 MPas;
      – on the pressure accumulator: 1,0 MPas.
7. If it is more than pressure drop, it is necessary to check, whether there were 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 an electric motor of the hydraulic pump

PERFORMANCE ORDER
1. To switch off ignition.
2. To lower pressure in hydraulic system.
3. To connect a manometer to the 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 stop of the pump maximum). This pressure should make 17,4–18,8 MPas.
7. To press a brake pedal.
8. To define pressure at which there is an inclusion of an electric motor of the hydraulic pump. This pressure should make 13–15 MPas. In case of default of this condition it is necessary to replace the sensor of pressure of an electric motor of the hydraulic pump.