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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 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

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+