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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+).


Test readings


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 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 Measure across Test reading See
1

WH

Wheel sensor, RR: Reference ground

In

Rotate the wheel one turn per second

1-2

>100 mV AC



2

VT

Wheel sensor, RR: Signal input

In

Rotate the wheel one turn per second

2-1

>100 mV AC



3

GN

Wheel sensor, FR: Reference ground

In

Rotate the wheel one turn per second

3-5

>100 mV AC



4



Spare











5

GY

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

RD

Wheel sensor, FL: Signal input

In

Rotate the wheel one turn per second

7-6

>100 mV AC



8

BK

Wheel sensor, RL: Reference ground

In

Rotate the wheel one turn per second

8-9

>100 mV AC



9

YE

Wheel sensor, RL: Signal input

In

Rotate the wheel one turn per second

9-8

>100 mV AC



10



Spare











11

GN

Data link

In/Out

Tech 2 not connected

11-B-

0 V



Tech 2 connected and TC/ABS selected for communication

11-B-

about 10 V



12

GN/RD

Pedal position

In

Idling

12-B-

8 Hz,

20 ms (+),

16 % (+)



Throttle pedal 50% depressed

12-B-

8 Hz,

50 ms (+),

40 % (+)

Wide open throttle

12-B-

8 Hz,

80 ms (+),

64 % (+)

13

GY

Engine torque limitation

Out





100 Hz,

measure on Trionic



14

GN/GY

Brake-lights switch

In

Brake pedal depressed

14-B-

B+



Brake pedal released

14-B-

0 V



15

BU/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

GY/NY

Indicator lamp

TCS OFF

Out

Open short-circuit contact strip

B+-20

<0.5 V



21

OG

ABS warning lamp

Out

Open short-circuit contact strip

B+-21

<0.5 V



22



Spare











23

VT

Wheel speed, rear left

Out

Rotate wheel slowly



0/about 12 V

Measure on MIU



Rotate the wheel one turn per second



about 6 V



24



Spare











25

GY/RD

Wheel speed, front right

Out

Rotate wheel slowly



0/about 12 V

Measure on Trionic



Rotate the wheel one turn per second



About 6 V



26



Spare











27

GY/RD

Engine torque

In



27-B-

100 Hz



28

GY/BK

TCS lamp

Out



B+-28

<0.5 V



29



Spare











30

BN

Engine rpm

In

Engine idling 700±25 rpm

30-B-

About 23 Hz



31

PK

Switch

TCS ON/OFF

In

Switch not depressed

B+-31

0 V



Switch depressed

B+-31

B+