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Lorenfb Lorenfb is offline
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Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
"Is there any way to directly test the dme relay? Without the car."

Yes!

Test setup requirements:
1. 12 volt battery
2. 12 volt test light
3. jumper leads

Test procedure:

1. Connect the 30 & 86 pins to +12 of the battery.
2. Connect one side of the test light to -12 of the
battery and the other side to the 30 & 86 pins.
The test light should light, if not the test light is bad.
Now connect the test light to the 87 pin.
3. Connect the 85 pin to -12 of the battery and
a 'click' will be heard and the test light will light.
This verifies the DME ECM power output.
4. Now remove the test light from pin 87 and
connect it to 87b, leaving the other side connected
to -12 of the battery.
5. While still connecting the 85 to -12 of the battery,
connect the 85b to -12 of the battery and another
'click' will be heard and the test light will light.
The verifies power to the fuel pump.

When in the car, the following must occur:

1. The 30 pin always has power.
2. The 86 & 87 pins have power when the key is "on".
3. The 87b pin has power when the engine is cranking
or running.
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Loren
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Automotive Electronics

'88 911 3.2
'04 GSXR1000
'01 Ducati 996
'03 BMW BCR - Gone

Last edited by Lorenfb; 07-26-2011 at 07:53 AM..
Old 07-25-2011, 09:27 PM
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