Vehicle Speed - Porsche Boxster Technical Manual

24 DME diagnosis Boxster
8
Test point 17
Throttle Connect voltmeter to control module connector pin 53 (+) and pin 34 (-)
potentiometer Ignition "ON"
DTC 117 Display: 5 V
Connect voltmeter to control module connector pin 44 (+) and pin 34 (-)
Ignition "ON" .
Display: in idle position approx. 0.55 V
with wide open throttle approx. 4.5 V
Measure resistance
Ignition "OFF"
Pull control module connector off the adapter, as otherwise the meas-
urement result will be falsified.
Connect ohmmeter to pin 44 and pin 34
8
Display: Idle position
Wide open throttle
Test point 18
Vehicle speed Test signal with an oscilloscope.
DTC 120 To do this, connect oscilloscope with terminal 79.
Ignition "ON"
Rotate right rear wheel by hand.
This must produce a square-wave signal of variable frequency.
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.1
:ah
r""" ,
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I
-,
~~: 1
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8
-, I
.1 I
B: 1
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=1
i:=:
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670.96
Note
After remedying the fault, erase the ABS;rC fault memory.
8
24 -D 40 24 01 Diagnosis,fTroubleshooting DME
98624D1 Printed in Germany -4, 1996