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24/28
Fuel System - Electronic Control 944 S/944 S2
Equipnient Required for DME Tests:
-
Diagnostics tester 9288 (9268) with
connecting leads
-
1 oscilloscope approved by Porsche
-
1 digital display multimeter with an internal
resistance of at least 10 M-ohms
-
1 Bosch L-Jetronic test lead, Bosch No.
1684 463 093 (check read for correct
polarity in plugs)
-
2 control unit plug test leads (local
manufacture) fitted with 2 flat male plugs,
'N 17.457.2, in order to avoid damage on
plug pins in the control unit plug while
testing
-
2 adapter test leads, consisting of 4 plug
connectors, N 017.483.1, soldered with 2
approx. 150 mm lang leads
-
1 three-pin test lead (e.g. VW VAG 1501)
-
2 control unit plug test leads (local
manufacture) fitted with 4 flat male plugs,
N 17.457.2
Test leads must always be used for
testing!
-
All sender and ignition timing signals of
Porsche models can be checked with the
engine reglers recommended by Porsche.
Instructions for connection of testers on a
car will be different depending on the
make, so that it will always be necessary
to conform with the instructions supplied
with a pertinent tester.
Sender Signals Which Can Be Checked
With An Oscilloscope:
-
Speed sender signal
-
Injection ( ) signals
-
Idle speed control activation signal
-
Hall sender signal
-
Ignition trigger signal to ignition final stage
-
Tank venting activation signal
as well as:
-
Reed switch signal (speedometer)
-
ABS wheel sensor signals
D 24/28 - 4
DME - Diagnosing/Troubleshooting
Printed In Germany - XXI, 1989