SAI signal simulator
11-21-2009, 06:04 PM
#17
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Update:
I could not find the appropriate fuse or relay for the SAI air-pump - so I just wiggled my hand in - and disconnected the electrical connection which is that long wire to the left of the air-pump itself - just above the distributors.
Sure enuf - when I did 'ignition on' - the air pump did NOT come on. So far so good.
I had my OBD-ii reader connected and took a looksee at the voltages of the (downstream) O2 sensors. Dahyum -- both showed .45V -- so, for all practical purposes there appears to be no 'obvious' difference (ignition on / engine off) inasfar as the O2 sensors are concerned - if the pump is running or not.
Oh well, back to the drawing board...
G.
I could not find the appropriate fuse or relay for the SAI air-pump - so I just wiggled my hand in - and disconnected the electrical connection which is that long wire to the left of the air-pump itself - just above the distributors.
Sure enuf - when I did 'ignition on' - the air pump did NOT come on. So far so good.
I had my OBD-ii reader connected and took a looksee at the voltages of the (downstream) O2 sensors. Dahyum -- both showed .45V -- so, for all practical purposes there appears to be no 'obvious' difference (ignition on / engine off) inasfar as the O2 sensors are concerned - if the pump is running or not.
Oh well, back to the drawing board...
G.
Cheers,
MIke
11-22-2009, 02:05 AM
#18
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I might have some input here.
I plugged in my OBD-ii reader and turned on the ignition - but didn't start the engine. Of course I could then hear the air pump puffing away to its heart's content.
Both downstream O2 sensors were showing 0.45 V -- which is the normal signal that you get when both catastrophic converters are 'working efficiently'. If both cats are 'bad' or there is a problem with the gasses that are blowing by -- these downstream O2 sensors usually start showing a HIGHER voltage, e.g. .8 to .9V
Well, now that my NY inspection is a thing of the past (i.e. last Sept. - so now I'm not too worried if I trip a CEL) -- my next trick will be to remove the relay that controls the SAI pump - disabling it from running -- and seeing if that has any effect on the voltages of the two downstream O2 sensors.
Stand by, as they say.
Gerry
I plugged in my OBD-ii reader and turned on the ignition - but didn't start the engine. Of course I could then hear the air pump puffing away to its heart's content.
Both downstream O2 sensors were showing 0.45 V -- which is the normal signal that you get when both catastrophic converters are 'working efficiently'. If both cats are 'bad' or there is a problem with the gasses that are blowing by -- these downstream O2 sensors usually start showing a HIGHER voltage, e.g. .8 to .9V
Well, now that my NY inspection is a thing of the past (i.e. last Sept. - so now I'm not too worried if I trip a CEL) -- my next trick will be to remove the relay that controls the SAI pump - disabling it from running -- and seeing if that has any effect on the voltages of the two downstream O2 sensors.
Stand by, as they say.
Gerry
04-27-2010, 12:05 PM
#21
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Working on it....having a bitch of a time getting the connectors I want, but I am making slow progress. This is turning out to be more of a waiting game than I anticipated...I am missing one key part, and am waiting for an ETA from the manufacturer in Europe since they have to do a manufacturing run. This is what happens when you are dealing with a 12+ year old car.
I am sorry for the long wait but there is only one path to getting these parts officially.....so unless I decide to circumvent (and violate a whole bunch of copyrights, etc.) I have to wait.
Cheers,
Mike
Cheers,
Mike
I am sorry for the long wait but there is only one path to getting these parts officially.....so unless I decide to circumvent (and violate a whole bunch of copyrights, etc.) I have to wait.
Cheers,
Mike
Cheers,
Mike
04-27-2010, 12:09 PM
#22
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Thanks for the update Mike! Personally I'm in no rush, just thought that you had a great idea and would like to get one of those kits before P1411 strikes 
Thanks again,
Ilko
Thanks again,
Ilko
04-28-2010, 02:45 AM
#23
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Working on it....having a bitch of a time getting the connectors I want, but I am making slow progress. This is turning out to be more of a waiting game than I anticipated...I am missing one key part, and am waiting for an ETA from the manufacturer in Europe since they have to do a manufacturing run.
06-08-2010, 09:45 PM
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Almost have the parts for the prototyping stage...its been a real challenge. Know what I want to build, but need the parts to get the physical design done. Will turn it over as quickly as possible, and then I need a few guys with this problem to test the solution....I am sure there will be some takers. David is #1 on the list if he can wait.
Cheers,
Mike
Cheers,
Mike
06-08-2010, 11:09 PM
#27
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Mike,
I'd love to volunteer as another tester. My 96 has had these problems for years; I flush and clean to pass emissions, only to hace the dreaded CEL come back.
regards,
Michael
I'd love to volunteer as another tester. My 96 has had these problems for years; I flush and clean to pass emissions, only to hace the dreaded CEL come back.
regards,
Michael
06-10-2010, 01:57 AM
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