PRE-RELEASE
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: |
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Observe the test conditions. Use common sense in assessing the readings.
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The test readings presented are taken with the ignition switched ON unless otherwise stated.
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Start by checking that the control module is receiving power and is grounded.
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Check all sensor inputs and signals from other systems.
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Finally, check the control module outputs. Remember that the readings do not provide an indication that the actuator is operating.
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If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components that need further checking.
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The specified readings are valid for a correctly calibrated Fluke 88/97.
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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+).
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| Control module connections |
| Note | ||
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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
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B+ - 4
|
B+
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2
|
+30 voltage, power
|
IN
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2 - B-
|
B+
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3
|
Current (+30 circuit)
|
IN
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3 - B-
|
B+
|
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4
|
Ground
|
IN
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B+ - 4
|
B+
|
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5
|
Wheel sensor, FL: signal input
|
IN
|
Rotate the wheel one turn per second
|
5 - 6
|
>100 mV AC
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6
|
Wheel sensor, FL: reference ground
|
IN
|
Rotate the wheel one turn per second
|
5 - 6
|
>100 mV AC
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7
|
Wheel sensor, RL: signal input
|
IN
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Rotate the wheel one turn per second
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7 - 27
|
>100 mV AC
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8
|
Wheel sensor, RR: reference ground
|
IN
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Rotate the wheel one turn per second
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29 - 8
|
>100 mV AC
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9
|
Wheel sensor, FR: reference ground
|
IN
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Rotate the wheel one turn per second
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10 - 9
|
>100 mV AC
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10
|
Wheel sensor, FR: signal input
|
IN
|
Rotate the wheel one turn per second
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10 - 9
|
>100 mV AC
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11
|
Data link
|
IN/OUT
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Tech 2 not connected
|
11- - B-
|
0 V
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Tech 2 connected and ESP selected for communication
|
11 - B-
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variable, approx. 10V
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12
|
Spare
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13
|
Spare
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14
|
P-bus -
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Bus information
|
14 - 4
|
approx. 2.5V
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15
|
System ground for yaw rate sensor
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Cannot be measured
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16
|
Yaw rate sensor, yaw rate signal
|
IN
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Cannot be measured
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17
|
Spare
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18
|
Yaw rate sensor, reference signal
|
OUT
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Cannot be measured
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19
|
Signal from wheel sensor, rear left
Used by special equipment |
OUT
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Cannot be measured
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20
|
Lateral acceleration sensor, lateral acceleration
|
IN
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Cannot be measured
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21
|
Spare
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22
|
Spare
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23
|
Spare
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24
|
Spare
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25
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Spare
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26
|
Spare
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27
|
Wheel sensor, RL: reference ground
|
IN
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Rotate the wheel one turn per second
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7 - 27
|
>100 mV AC
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28
|
Current (+15 circuit)
|
IN
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28 - B-
|
B+
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29
|
Wheel sensor, RR: signal input
|
IN
|
Rotate the wheel one turn per second
|
29 - 8
|
>100 mV AC
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30
|
Brake Light Switch
|
IN
|
Brake pedal depressed
|
30 - B-
|
B+
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Brake pedal released
|
30 - B-
|
0 V
|
||||
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31
|
ESP ON/OFF switch
|
IN
|
Switch not depressed
|
B+ - 31
|
0 V
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Switch depressed
|
B+ - 31
|
B+
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||||
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32
|
Spare
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33
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Spare
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34
|
Spare
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35
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P-bus +
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Bus information
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35 - 4
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approx. 2.5V
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36
|
Spare
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37
|
Yaw rate sensor, reference signal
|
OUT
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Cannot be measured
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38
|
Spare
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39
|
Spare
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40
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Signal from wheel sensor, front right, for PSG16
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Cannot be measured
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41-45
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Spare
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