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Connect voltmeter on terminal 17 and terminal 9 of LH control unit plug with help of auxiliary lead and apply on ground terminal 21 (body) with help of auxiliary lead. LH relay must be activated. Display battery voltage. Connect voltmeter between connected CEL plug W 23 and ground and then connect between terminal 17 and terminal 21 of LH control unit plug with help of auxiliary lead (ground signal to LH relay . Display battery voltage. If battery voltage is displayed, check lead connection...

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Porsche 928 Auxiliary Fan

If ti is not stopped while decelerating, see Test Step 12 al Start engine, at idle speed with vacuum on pressure regulator Test pressure 3.3 0.2 bar. Test on stopped engine and running fuel pump without vacuum on pressure regulator for this purpose fuel pump relay XX is removed and terminals 87 and 30 bridged Test pressure 3.8 0.2 bar. Slowly pinch return hose of pressure regulator with a hose clamp e.g. at fuel level transmitter Fuel pressure with running pump less than 4.5 bar check fuel...

Service Training Center

Sun Engine Motor Tester 1010

Porsche Precautions for Working on Electronic Ignition Systems 0 - 02 Testing Requirements EZK and LH - 03 Relay and Plug Connections on CEL - 02 Plug Connections - Control Unit - 03 Plug Connections - Control Unit EZK -04 Wiring Diagram for 928 S 4 Engine Electrical System 05 1. Ground Points Plug Connections - EZK and -07 2. Power Supply for EZK Control Unit 12 3. Speed and Reference Mark -14 4. Temperature Sensor II -15 5. Throttle Valve Switch for Idle Spped...