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By the way... 200

posted by  AOG on  Sat Jul 6 22:04 CST 2013
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last visit: Sun Feb 2 13:09 CST 2014
[RELATED]

I was able to answer my own question about pin #21 at the ECU. Looking over the wiring diagram it seems that by grounding pin #21 (with ignition on and connector still plugged into the ECU) you are signaling the main/fuel pump relay to keep the main ECU contact closed to apply power to the AMM even though it would not be powered because there is no RPM signal. Although when I removed the grounding connection, I didn't hear the relay click off... hmmm.

This was the test on page 241-15 of the Bentley manual for the AMM power supply






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