System Diagnosis

EQUIPMENT REQUIRED FOR LH/EZK TESTING:

- Diagnostic tester 9288 (9268) with connecting leads

- 1 oscilloscope approved by Porsche

- 1 digital display multimeter, internal resistance at least 10 MOhm

- 1 Bosch L Jetronic test lead, Bosch No. 1684 463 093 (check lead for correct polarity at plugs).

- 2 control unit plug test leads (to be made up in your own workshop) with two No. 17.457.2 tab connectors, to avoid damage to the contacts in the control - unit plug during testing.

- 2 adapter test leads, consisting of: 4 N 017.483.1 plug connectors with 2 leads approx. 150 mm long, soldered.

- 1 3 pin test lead (e.g. VW VAG 1501).

- 2 control unit plug test leads (to be made up in your own workshop) equipped with 4 N 17.457.2 tab connectors.

- The test leads must always be used for testing.

- All sensor and ignition timing signals on Porsche automobiles can be checked with the engine testers recommended by Porsche.

Since each tester manufacturer issues different instructions for connection to the vehicle, these instructions should always be followed carefully to ensure correct tester connection.

The following sensor signals can be checked with the oscilloscope:

- Engine speed sensor signal I reference mark signal

- ti signals

- Idle speed control activation

- Hall sensor signal

- Ignition trigger signal to ignition output stage

- Fuel tank venting activation signal

- Resonance flap activation signal

as well as:

- Reed switch signal (speedometer)

- ABS wheel sensor signals