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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 taken 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 Component/function In/Out Test conditions Test across Test reading See
1

Pump motor, power ground

In



B+ - 4

B+



2

+30 voltage, power

IN



2 - B-

B+



3

Current (+30 circuit)

IN



3 - B-

B+



4

Ground

IN



B+ - 4

B+



5

Wheel sensor, FL: signal input

IN

Rotate the wheel one turn per second

5 - 6

>100 mV AC



6

Wheel sensor, FL: reference ground

IN

Rotate the wheel one turn per second

5 - 6

>100 mV AC



7

Wheel sensor, RL: signal input

IN

Rotate the wheel one turn per second

7 - 27

>100 mV AC



8

Wheel sensor, RR: reference ground

IN

Rotate the wheel one turn per second

29 - 8

>100 mV AC



9

Wheel sensor, FR: reference ground

IN

Rotate the wheel one turn per second

10 - 9

>100 mV AC



10

Wheel sensor, FR: signal input

IN

Rotate the wheel one turn per second

10 - 9

>100 mV AC



11

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

Spare











13

Spare











14

P-bus -

Bus information

14 - 4

approx. 2.5V



15

System ground for yaw rate sensor





Cannot be measured



16

Yaw rate sensor, yaw rate signal

IN



Cannot be measured



17

Spare











18

Yaw rate sensor, reference signal

OUT



Cannot be measured



19

Signal from wheel sensor, rear left

Used by special equipment

OUT



Cannot be measured



20

Lateral acceleration sensor, lateral acceleration

IN



Cannot be measured



21

Spare











22

Spare











23

Spare











24

Spare











25

Spare











26

Spare











27

Wheel sensor, RL: reference ground

IN

Rotate the wheel one turn per second

7 - 27

>100 mV AC



28

Current (+15 circuit)

IN



28 - B-

B+



29

Wheel sensor, RR: signal input

IN

Rotate the wheel one turn per second

29 - 8

>100 mV AC



30

Brake Light Switch

IN

Brake pedal depressed

30 - B-

B+



Brake pedal released

30 - B-

0 V

31

ESP ON/OFF switch

IN

Switch not depressed

B+ - 31

0 V



Switch depressed

B+ - 31

B+

32

Spare











33

Spare











34

Spare











35

P-bus +

Bus information

35 - 4

approx. 2.5V



36

Spare











37

Yaw rate sensor, reference signal

OUT



Cannot be measured



38

Spare











39

Spare











40

Signal from wheel sensor, front right, for PSG16





Cannot be measured



41-45

Spare