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Test readings, control module connections

Test readings, control module connections


Scope

Test readings and instructions for measuring signals and signal levels on the ABS control module are given in the following pages.

Points to remember:


• Measurements should be taken directly from the electronic control module sensor connector. Remove the electronic control module connector.

• Some voltage levels must be regarded as guiding values. Use your common sense when judging whether a reading is correct or not.

• If any test reading is incorrect, use the wiring diagram to trace the leads, connectors or components which you consider ought to be checked more thoroughly.

• Page references in the table refer to the page on which the description of operation of the signal concerned will be found, and also to the fault diagnosis schedule containing a complete description of the diagnostic procedure to be followed.

• If nothing else is indicated the ignition timing should be disconnected.

• The test reading given concerns calibrated FLUKE 88/ 97.

Note

There is no BOB cable to ABS 5.3. Test readings, electronic control module connections



> = Greater than < = Less than » = Approximately equal to ∼ = Alternating current

Important

Test reading at the electronic control module sensor connector, unless otherwise stated


Pin

Colour

Component/Function

in/Out

Test condition

Test reading

Across X-Y

1

YE

Wheel sensor RR Reference ground

In

Rotate the wheel 1 turn/second

>100 mV AC

1-2

2

BK

Wheel sensor RR Signal input

In

Rotate wheel 1 rev/sec.

>100 mV AC

2-1

3

BK

Wheel sensor FR Reference ground

In

Rotate wheel 1 rev/sec.

>100 mV AC

3-5

4



Not used









5

YE

Wheel sensor FR Signal input

In

Rotate wheel 1 rev/sec.

>100 mV AC

5-3

6

BK

Wheel sensor FL Reference ground

In

Rotate wheel 1 rev/sec.

>100 mV AC

6-7

7

YE

Wheel sensors FL Signal input

In

Rotate wheel 1 rev/sec.

>100 mV AC

7-6

8

BK

Wheel sensor RL Reference ground

In

Rotate wheel 1 rev/sec.

>100 mV AC

8-9

9

YE

Wheel sensor RL Signal input

In

Rotate wheel 1 rev/sec.

>100 mV AC

9-8

10



Not used









11

WH/BK

Data link

in/Out







12



Not used









13



Not used









14

VT

Brake light switch

In

Brake activated

B+

14-16

15

YE/RD

+15 voltage

In

Ignition on

<0.5V

15-B+

16

BK

Power ground

In



B+

16-B+

17

RD

+30 voltage

In



<0.5V

17-B+

18

RD

+30 voltage

In



<0.5V

18-B+

19

BK

Ground

In



B+

19-B+

20



Not used









21

GY/GN

Warning lamp ABS

In

Ignition on

<0.5V

21-B+

22



Not used









23

OG/WH

Wheel speed RL

Out

Slowly rotate the wheel Rotate the wheel 1 turn/second

0/approx. 12 V approx. 6 V

*)

24

YE/BN

Wheel speed RR

Out

See pin 23

See pin 23

*)

25

BK/GN

Wheel speed FL

Out

See pin 23

See pin 23

*)

26

PK/BK

Wheel speed FR

Out

See pin 23

See pin 23

*)




*) = Must be tested at the receiving components