Porsche 944 User Manual download pdf (Page 138)

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

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