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Location: North Idaho
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Where does DME get power from?
On late model 944s, 968s...where does the power come from? Directly from the battery? Ignition Switch? Or?
Harvey
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'94 968 Coupe, 6-speed '88 928 S4, 5-speed '85 928 S, 5-speed (Sold) '02 Audi TT Turbo, 6 speed (Sold) |
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06-09-2005, 05:20 AM
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Location: Viera FL
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Ignition switch
AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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06-09-2005, 06:01 AM
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Thank you!
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'94 968 Coupe, 6-speed '88 928 S4, 5-speed '85 928 S, 5-speed (Sold) '02 Audi TT Turbo, 6 speed (Sold) |
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06-09-2005, 07:13 AM
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Really? Then why does it have a DME relay???
http://www.*****************.com/product_p/pp993.615.227.00.htm
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! Last edited by SoCal Driver; 06-09-2005 at 08:13 AM.. |
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06-09-2005, 07:48 AM
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Should also have one of these that tend to go bad:
http://www.*****************.com/product_p/pp928.602.706.01alt.htm
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-09-2005, 08:18 AM
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I stand corrected.
The DME relay gets its power from the battery The ignition switch closes the DME relay, powering the DME. Happy? AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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06-09-2005, 08:25 AM
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Quote:
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-09-2005, 08:34 AM
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I knew I shouldn't have huffed all of that carb cleaner this morning....
AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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06-09-2005, 10:20 AM
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Location: Edmonton, Alberta, Canada
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Quote:
 There are kittens crying throughout the world as we speak. 
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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06-09-2005, 12:04 PM
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Yeah... I suck.
AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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06-09-2005, 03:18 PM
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Back to the question. What should have power with the key on.
The injectors and the coil/ignition module. If there is no voltage to the coil then the ignition switch is not working/bad. If there is voltage to the coil but not the injectors then the DME relay is not engaging. If there is voltage to both then the DME is getting it's 12 volts along with the injectors (same circuit). Check that the fuel pump is working during cranking. This tells you that the second set of contacts in the DME/fuel pump relay are being pulled in by the DME as it sees the control voltage going to the starter. You can check wither the DME is reading the flywheel sensor by getting a NOID light and seeing if the injectors are pulsing. No sensor signal no pulsing. Report your findings.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-09-2005, 04:40 PM
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Also need to check the alarm as this will remove power from the DME too.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-09-2005, 04:52 PM
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1983 Porsche 944 2.5 liter
