Quote:
Originally Posted by Das Benz
I did another quick test. I started the ac, and unplugged the EHA.. Car idles like normal, duty cycle drops to 0%. but eco gauge stays at left where it belongs, idle does not jump every 20sec like it did with it plugged in and A/C on... didn't get a chance to test drive with unplugged eha but will soon.
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The EHA, via the ECU, is responding to the exhaust gas oxygen content as detected by the O2 sensor. Some O2 sensors, when in their dotage, have been known to deliver signals that are reversed in polarity from the normal. Unplugging the EHA has removed the O2 feedback of fuel/air mixture from the CIS. It is, in effect, operating open-loop.
Also, there is a connection between the compressor control unit, and the idle speed control unit, as you would expect.
Re: thread title
"delima", or, deli ma: the matriarch of the delicatessen