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Help with DME inputs and outputs Please
Hi i am needing to know how to test the sender units feeding my 86 3.2 DME
I have no spark and no signal to the injectors . I have tested the DME relay OK, The DME control unit OK, Any help from an expert would be great. Thanks John |
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03-18-2016, 04:26 PM
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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,020
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First guess would be the flywheel reference sensors or the cylinder head temp sensor but you have already started on the right track: Test, test, test!
(I am endlessly bothered by posts relating how many parts people have replaced.) Also think about updating your signature with a location so if somone is local they can always tell.
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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. |
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03-19-2016, 05:03 AM
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Does this help?
 
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Ed 1973.5 T |
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03-19-2016, 05:53 AM
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Join Date: Sep 2007
Location: Oakland Park, FL
Posts: 151
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I hope that you find this helpful...
Take a look at this Reference Sensor Testing Procedure: How to test a Porsche 944 RPM and TDC sensor Use these Instructions to further diagnose the car: http://site.ecudoctors.com/tech-data/DME-Diagnose-Follow-up-Forms.pdf
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Specialized ECU Repair Porsche Bosch Motronic DME Specialists Free DME Testing for Pelican Parts Members www.ECUdoctors.com 1-800-328-1425 Last edited by S ECU Repair; 03-22-2016 at 12:00 PM.. Reason: typo |
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03-22-2016, 12:00 PM
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Join Date: Dec 2009
Location: Wayne, PA
Posts: 2,010
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I just went through this same thing myself. It drove me crazy. In my case my brain had some bad spots. Ingo Schmitz on this board repaired mine. It could also be the crank sensors as others have pointed out.
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Christopher Mahalick 1984 911 Targa, 1974 Lotus Europa TCS 2001 BMW 530i(5spd!), Ducati 900 SS/SP 2006 Kawasaki Ninja 250, 2015 Yamaha R3 1965 Suzuki k15 Hillbilly, 1975 Suzuki GT750 |
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03-22-2016, 12:12 PM
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First make sure you get power to the DME when the ignition is ON. Check that the ICV is vibrating. If not an alarm or aftermarket alarm unit or the ignition switch could be at fault. Next up are the DME relay (swap it or jumper it). Once that is out of the way the next suspects are the sensors.
Testing the speed sensor should be done with a digital voltmeter set to AC Volt. Disconnect the DME, crank and measure the voltage between pin 8 and pin 27 inside the harness connector. You should see ~ 2V AC during cranking. For the reference sensor the measurement is a little more difficult because there is only a short pulse per rotation. But the voltmeter will still register something very small. The continuity test (OHM setting) is less reliable. Even if the sensors Ohm out OK there were many incidents here where one of the sensors was bad. Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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03-22-2016, 01:33 PM
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The Other Woman
1974 Porsche 911 Targa 3.6
