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914World.com _ 914World Garage _ AAR Voltage

Posted by: solex May 9 2020, 11:01 AM

Hi All,
I'm debugging the hunting idle and just cleaned and validated the AAR is working properly on my bench.

When checking the voltage in the car I noticed then when the key is turned to the ON position I get a flash of voltage but it drops down to zero instantly and do not notice a constant 12 V when the engine is running. Is this the correct?

Thanks,
Dan

Posted by: Morrie May 9 2020, 11:16 AM

QUOTE(solex @ May 9 2020, 12:01 PM)

When checking the voltage in the car I noticed then when the key is turned to the ON position I get a flash of voltage but it drops down to zero instantly and do not notice a constant 12 V when the engine is running. Is this the correct?
Thanks,
Dan

Hi Dan,

My understanding is that the AAR is powered by the fuel pump relay. There would be a flash of power with the key on and engine off, as the fuel pump only runs for a few seconds with the engine not started to prime the system. Test again with the engine running and you should see 12V all the time at the valve.

Posted by: GregAmy May 9 2020, 12:08 PM

Only on when the fuel pump is engaged.

Posted by: solex May 10 2020, 01:59 PM

Thank you both, after cleaning it up, I confirmed that it works and is completely closed when the car has warmed up.