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Test readings, control-module connections

Test readings, control-module connections



Scope

Values and readings for measuring signals and levels in the TC/ABS control module are given in the following pages.

Points to remember:


• Observe the test conditions. Use common sense in assessing the readings.

• The test readings presented are with the ignition switched ON unless otherwise stated.

• Start by checking that the control module is receiving power and is grounded.

• Check all sensor inputs and signals from other systems.

• Finally, check the control module outputs. Remember that the readings do not provide an indication that the actuator is operating.

• If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components that need further checking.

• The specified readings are valid for a correctly calibrated Fluke 88/97.

• The readings %(+) and ms(+) indicate the pulse ratio and pulse length. A test instrument capable of measuring both pulse ratio and pulse length must be used. The "+" sign denotes a positive trigger pulse (TRIG+).


Control module connections


Important

BOB cable assemblies have not been produced for ABS 5.3, ABS 5.4 or TC/ABS 5.3. Unless otherwise stated, the test readings are those that should be obtained on the control module's connector (unplugged). For TC/ABS 5.3, certain readings can be taken with the BOB cable assembly connected to the Trionic T7 control module, see the notes under Test reading.


> = greater than; < = less than; ~ = alternating current (LP: LOGIC PROBE P = select pulse; p = visible pulse)

Pin Cable colour Component/function In/Out Test conditions Test across Test reading See
1

YE

Wheel sensor, RR: Reference ground

In

Rotate the wheel one turn per second

1-2

>100 mV AC



2

BK

Wheel sensor, RR: Signal input

In

Rotate the wheel one turn per second

2-1

>100 mV AC



3

WH

Wheel sensor, FR: Reference ground

In

Rotate the wheel one turn per second

3-5

>100 mV AC



4



Spare











5

VT

Wheel sensor, FR: Signal input

In

Rotate the wheel one turn per second

5-3

>100 mV AC



6

BU

Wheel sensor, FL: Reference ground

In

Rotate the wheel one turn per second

6-7

>100 mV AC



7

BU

Wheel sensor, FL: Signal input

In

Rotate the wheel one turn per second

7-6

>100 mV AC



8

GY

Wheel sensor, RL: Reference ground

In

Rotate the wheel one turn per second

8-9

>100 mV AC



9

GN

Wheel sensor, RL: Signal input

In

Rotate the wheel one turn per second

9-8

>100 mV AC



10



Spare











11

WH/BK

Data link

In/Out

Tech 2 not connected

11-B-

0 V



Tech 2 connected an TC/ABS selected for communication

11-B-

about 10 V



12



Spare











13



Spare











14

VT

Brake-lights switch

In

Brake pedal depressed

14-B-

B+





Brake pedal released

14-B-

0 V

15

YE/RD

Current (+15 circuit)

In



15-B-

B+



16

BK

Pump-motor ground

In



B+-16

B+



17

RD

Current (+30 circuit)

In



17-B-

B+



18

RD

Current (+30 circuit)

In



18-B-

B+



19

BK

Ground

In



B+-19

B+



20



Spare











21



Spare











22



Spare











23



Signal from wheel sensor, rear left

Used for special equipment

Out

Rotate the wheel one turn per second



>100 mV AC



24



Signal from wheel sensor, rear right

Used for special equipment

Out

Rotate the wheel one turn per second



>100 mV AC



25



Spare











26



Spare











27



Spare











28



Spare











29



P-bus -

Bus information

Not measurable



30



P-bus +

Bus information

Not measurable



31

BK/GN

Switch, TCS ON/OFF

In

Switch not depressed

B+-31

0 V



Switch depressed

B+-31

B+