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 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 | Cable colour | Component/function | In/Out | Test conditions | Test across | Test reading | See |
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1
|
WH
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Wheel sensor, RR: Reference ground
|
IN
|
Rotate the wheel one turn per second
|
1 - 2
|
>100 mV AC
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2
|
VT
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Wheel sensor, RR: Signal input
|
IN
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Rotate the wheel one turn per second
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2 - 1
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>100 mV AC
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3
|
GN
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Wheel sensor, FR: Reference ground
|
IN
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Rotate the wheel one turn per second
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3 - 5
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>100 mV AC
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4
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Spare
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5
|
GY
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Wheel sensor, FR: Signal input
|
IN
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Rotate the wheel one turn per second
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5 - 3
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>100 mV AC
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6
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BU
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Wheel sensor, FL: Reference ground
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IN
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Rotate the wheel one turn per second
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6 - 7
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>100 mV AC
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7
|
RD
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Wheel sensor, FL: Signal input
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IN
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Rotate the wheel one turn per second
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7 - 6
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>100 mV AC
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8
|
BK
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Wheel sensor, RL: Reference ground
|
IN
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Rotate the wheel one turn per second
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8 - 9
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>100 mV AC
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9
|
YE
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Wheel sensor, RL: Signal input
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IN
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Rotate the wheel one turn per second
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9 - 8
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>100 mV AC
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10
|
YE
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Lateral acceleration sensor, lateral acceleration
|
IN
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Cannot be measured
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11
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GN
|
Data link
|
IN/OUT
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Tech 2 not connected
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11- - B-
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0 V
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Tech 2 connected and ESP selected for communication
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11 - B-
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variable, approx. 10V
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||||
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12
|
OG
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Yaw rate sensor, reference signal
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OUT
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Cannot be measured
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13
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Spare
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14
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GN/GY
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Brake-lights switch
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IN
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Brake pedal depressed
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14 - B-
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B+
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Brake pedal released
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14 - B-
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0 V
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|||||
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15
|
RD/BU
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Current (+15 circuit)
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IN
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15 - B-
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B+
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16
|
BK
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Pump-motor ground
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In
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B+ - 16
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B+
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17
|
RD
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Current (+30 circuit)
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IN
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17 - B-
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B+
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18
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RD
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Current (+30 circuit)
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IN
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18-B-
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B+
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19
|
BK
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Ground
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IN
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B+ - 19
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B+
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20
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Spare
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21
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Spare
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22
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RD/WH
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Brake pressure sensor, power supply, 5 V
|
IN
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Cannot be measured
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23
|
GN
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Signal from wheel sensor, rear left
Used by special equipment |
OUT
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Cannot be measured
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24
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GN/BU
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Yaw rate sensor, reference signal
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OUT
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Cannot be measured
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25
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BK/YE
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Yaw rate sensor, yaw rate signal
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IN
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Cannot be measured
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26
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RD/GY (MY04)
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Signal from wheel sensor, front right, for PSG16 (M04)
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Cannot be measured
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27
|
PK
|
ESP ON/OFF switch
|
IN
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Switch not depressed
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B+ - 27
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0 V
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Switch depressed
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B+ - 27
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B+
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28
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BK
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System ground for yaw rate sensor and pressure sensor
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Cannot be measured
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29
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WH
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P-bus -
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Bus information
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29 - 19
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approx. 2.5V
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30
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GN
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P-bus +
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Bus information
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30 - 19
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approx. 2.5V
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31
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BN/WH
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Pressure sensor, brake pressure
|
IN
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Cannot be measured
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