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North Coast Cab's Avatar
 
Join Date: Sep 2002
Location: Cleveland
Posts: 4,422
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DME Relay Cycling

Having some issues. The DME relay is just cycling, can feel it on my hand, so the car will continue to break-up upon acceleration.
I have checked the speed sensor gap and even changed the sensor.
Need some help!
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1985.5 944 GTS
Old 05-02-2009, 03:11 PM
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Join Date: Nov 2004
Location: ronkonkoma ny 11779
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did you replace the relay?
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83 944....bye bye
85.5 euro spec 944, 5sp (she's gone....
74 914...hasta LA Vista baby
87 924s....don't let the door hit ya
68 912.......see ya!
Old 05-02-2009, 09:10 PM
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Replaced relay, swapped DME.
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1985.5 944 GTS
Old 05-03-2009, 05:01 AM
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Join Date: Jun 2002
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The DME relay has two relays inside it. You need to verify the power signal(s) coming into the relay.

Pull the DME relay and check power at these pins:

Pin #30 - constant 12V power from battery
Pin #86 - 12V signal from key switch "on" position

You need to verify power at these two pins first. Pin #86 (+) latches the first relay that connects the constant power from Pin #30 to Pin #87 which sends the 12V power signal to the DME.

If your power signal from your key switch is intermittant then the the power supply to the DME will be inconsistant. The second relay is responsible for providing power to whatever is listed under fuse #34 - fuel pump, oxygen sensor ect.
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944 Turbo S - Plug & Play Vi-PEC V44 EMS, GT3076R
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Old 05-03-2009, 09:02 AM
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