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Test readings, control-module connections

Test readings, control-module connections



Scope

The following pages include the values and readings for measuring the signals and levels on the ESP control module.

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


Note

A BOB cable assembly has not been produced for ESP. Unless otherwise stated, the test readings are those that should be obtained on the control module connector (unplugged).


> = 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

YE

Lateral acceleration sensor, lateral acceleration

IN



Cannot be measured



11

GN

Data link

IN/OUT

Tech 2 not connected

11- - B-

0 V



Tech 2 connected and ESP selected for communication

11 - B-

variable, approx. 10V



12

OG

Yaw rate sensor, reference signal

OUT



Cannot be measured



13



Spare











14

GN/GY

Brake-lights switch

IN

Brake pedal depressed

14 - B-

B+



Brake pedal released

14 - B-

0 V

15

RD/BU

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

RD/WH

Brake pressure sensor, power supply, 5 V

IN



Cannot be measured



23

GN

Signal from wheel sensor, rear left

Used by special equipment

OUT



Cannot be measured



24

GN/BU

Yaw rate sensor, reference signal

OUT



Cannot be measured



25

BK/YE

Yaw rate sensor, yaw rate signal

IN



Cannot be measured



26

RD/GY (MY04)

Signal from wheel sensor, front right, for PSG16 (M04)





Cannot be measured



27

PK

ESP ON/OFF switch

IN

Switch not depressed

B+ - 27

0 V



Switch depressed

B+ - 27

B+

28

BK

System ground for yaw rate sensor and pressure sensor





Cannot be measured



29

WH

P-bus -

Bus information

29 - 19

approx. 2.5V



30

GN

P-bus +

Bus information

30 - 19

approx. 2.5V



31

BN/WH

Pressure sensor, brake pressure

IN



Cannot be measured