Ford Sierra

3.1.4.10.6. Check of functioning ABS

THE GENERAL DATA

Functioning check

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

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

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

Check of a hydraulic contour

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The prevention

The hydraulic contour of antiblocking system (ABS) Teves is under a high pressure. Therefore before the beginning of all operations on check it is necessary to lower necessarily 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".

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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 manometre 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 up, whether pressure to size 4–9 МПа quickly increases. If size of pressure other it is necessary to replace the pressure accumulator. 7. To unhook cables from loops. 8. To lift the car. 9. A coupling guard. 10. The bottom bolts of fastening картера couplings to the block of cylinders.

System ABS Teves diagnostics

Checked element	Measurement between contacts	Value	Measurement conditions
Weight of the case of the electronic actuation device of system ABS	"1" and weight	0 – 0,5 Ohm	Ignition is switched off
Weight of hydraulic knot	"11" and weight	0 – 0,5 Ohm	Ignition is switched off
Pressure of power supplies	"1" and "2"	More than 10 In	Ignition is included
The 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
The main electromagnetic valve	"18" and "11"	2 – 5 Ohm	Ignition is switched off
The 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
The 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
The gauge of level of a brake liquid	"9" and "10"	0 – 0,5 Ohm	Ignition is switched off
The gauge of speed of rotation of a forward left wheel	"5" and "23"	0,8 – 1,4 Ohm More than 0,5 In *	At measurement of pressure ignition is switched off
The gauge of speed of rotation of a forward right wheel	"7" and "25"	0,8 – 1,4 Ohm More than 0,5 In *	At measurement of pressure ignition is switched off
The gauge of speed of rotation of a back left wheel	"6" and "24"	0,8 – 1,4 Ohm More than 0,5 In *	At measurement of pressure ignition is switched off
The gauge of speed of rotation of a back right wheel	"4" and "22"	0,8 – 1,4 Ohm More than 0,5 In *	At measurement of pressure ignition is switched off
Gauge isolation	The gauge and weight	More than 20 clod	Ignition is switched off
Control bulb	"27" and weight	0,5 – 1,5 IN	Ignition is included

* To rotate a car wheel.

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The prevention

For prevention of damage of contacts of a multicontact socket of the electronic actuation device of antiblocking system connection of the transitive payment which contacts should be used for check of electric parametres is recommended that in the course of measurements not to use contacts of a socket of the electronic actuation device.

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Check of time of gymnastics of the accumulator of pressure

PERFORMANCE ORDER

1. To lower pressure in the pressure accumulator. 2. To connect a manometre to the pressure accumulator (see above). 3. To include ignition. 4. To check up time стабилизирования pressure to size 4–9 МПа. This time should be less than 60 seconds. If this condition is not carried out, it is necessary to check up pump functioning, a filter condition in a tank of a 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 manometre to the pressure accumulator (see above). 3. To include ignition and to wait, while pressure is not stabilised. 4. To switch off ignition. 5. To wait for 5 minutes and to define pressure drop in this time. It should not exceed 1 МПа.

Check of tightness of a hydraulic contour

PERFORMANCE ORDER

1. To lower pressure in system. 2. To connect a manometre to the pressure accumulator (see above). 3. To connect additional manometres to деаэраторам both brake supports of forward wheels. 4. To include ignition. 5. To establish pressure 10 МПа in a contour, pressing a pedal of a brake by means of the special adaptation. 6. To define on manometres pressure drop in 5 minutes. It should not exceed:       – On supports: 0,5 МПа;       – On the pressure accumulator: 1,0 МПа. 7. If it is more than pressure drop, it is necessary to check up, 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 gauge 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 manometre to the pressure accumulator. 4. To include ignition. 5. To wait before deenergizing of the engine of the hydraulic pump. 6. To check up pressure after a pump stop (as much as possible). This pressure should make 17,4–18,8 МПа. 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 МПа. In case of default of this condition it is necessary to replace the gauge of pressure of an electric motor of the hydraulic pump.