Quote:
Originally Posted by blue62
My current understanding of the SAI test is that it happens in closed loop. When the ECU decides it is ready to test the SAI it turns on the air pump while in closed loop. the ECU then looks for a voltage drop to .200 millivolts at the pre cat o2 sensor within 2 seconds. This voltage drop is conformation to the ECU of the correct excess o2 in the exhaust in the correct time frame Thus the SAI is working properly.
If the ECU fails to see those changes it throws a SAI related code.
The SAI function in open loop at start up is to help the cats warm up faster and help burn off hydrocarbons.
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Good information to keep in the memory bank. Thanks.
So, in that case maybe Speedyspaghetti should let it run a few minutes for it go into closed loop, and THEN let it idle for 2-1/2 minutes to do the SAI test?