02 pre-cat sensor/s test procedure - Yamae
#2
Moderator
http://sekainokurumakara.cocolog-nif.../o23-75a3.html
I think I need to explain important part in English at least for you. But I have to go out now and I will be doing it after coming back.
#3
Driver School Candidate
Thread Starter
I hope the link below may help you some although it is for a JDM Celsior UCF10 of early version and things are mostly written in Japanese.
http://sekainokurumakara.cocolog-nif.../o23-75a3.html
I think I need to explain important part in English at least for you. But I have to go out now and I will be doing it after coming back.
http://sekainokurumakara.cocolog-nif.../o23-75a3.html
I think I need to explain important part in English at least for you. But I have to go out now and I will be doing it after coming back.
I did find the O1 and O2 ports but not sure if the other connection should be ground or another port. It appears in the Japanese article it might be the E1 port but I will wait for your explanation.
Thank you,
#4
Moderator
The red one is coming from Bank1 O2 sensor and the one indicated OX2 below is from Bank2.
When you measure the voltage, you need to warm up the engine and then keep the engine rpm 2000rpm and connect the probes of your voltage meter to OX1/OX2 and E1.
The voltage has to swing at least 0.35V to 0.7V acrossing 0.45V. A good O2 sensor and a good engine usually swings between 0.1V to 0.9V.
You also can confirm measuring the feed back voltage VF1/VF2. It should be 2.5±1.3V(ranging 1.2~3.8V).
#5
Driver School Candidate
Thread Starter
#6
Moderator
I have experienced several cars that turned on the engine check light just once in a while. I mean the car is usually OK without turning on the light but it turns on when going down/up long hill or just running a plain flat road for a long time. These cars were all fixed by changing the O2 sensor. Those aged sensors did not generate the voltage enough. The high side was less than 0.65V.
The page below may help you to know more.
http://www.mxcom.net/hearst/motor/mo...tor_eNews.html
Last edited by Yamae; 12-26-14 at 05:08 PM. Reason: To add a link.
#7
Driver School Candidate
Thread Starter
A good reading range is between less than 0.35V to higher than 0.7V. Your result is a bit less or should I say narrower. In other words the low side should be less than 0.35V and the high side should be higher than 0.7V. But a precise measurement needs an oscilloscope though. An aged O2 sensor usually can't generate enough voltage.
I have experienced several cars that turned on the engine check light just once in a while. I mean the car is usually OK without turning on the light but it turns on when going down/up long hill or just running a plain flat road for a long time. These cars were all fixed by changing the O2 sensor. Those aged sensors did not generate the voltage enough. The high side was less than 0.65V.
The page below may help you to know more.
http://www.mxcom.net/hearst/motor/mo...tor_eNews.html
I have experienced several cars that turned on the engine check light just once in a while. I mean the car is usually OK without turning on the light but it turns on when going down/up long hill or just running a plain flat road for a long time. These cars were all fixed by changing the O2 sensor. Those aged sensors did not generate the voltage enough. The high side was less than 0.65V.
The page below may help you to know more.
http://www.mxcom.net/hearst/motor/mo...tor_eNews.html
I finished reading the article supplied and from that information I can see why a scope is the proper tool for testing the O2 sensors. I think my volt meters may not be accurate or quick enough to give good readings but will do the testing again.
Last edited by surfRider; 12-27-14 at 01:59 PM. Reason: additional info.
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#8
Driver School Candidate
Thread Starter
After several tests I was not able to get satisfactory readings. Both of my voltmeters would jump from no voltage to 11+ volts but not consistent enough to pick a range. I think the next best thing to do is replace at least one sensor and test. If nothing improves maybe swap the sensor to the second side, if still nothing then get a second sensor and (keeping my fingers crossed) replace both.
#9
Driver School Candidate
Thread Starter
A good reading range is between less than 0.35V to higher than 0.7V. Your result is a bit less or should I say narrower. In other words the low side should be less than 0.35V and the high side should be higher than 0.7V. But a precise measurement needs an oscilloscope though. An aged O2 sensor usually can't generate enough voltage.
I have experienced several cars that turned on the engine check light just once in a while. I mean the car is usually OK without turning on the light but it turns on when going down/up long hill or just running a plain flat road for a long time. These cars were all fixed by changing the O2 sensor. Those aged sensors did not generate the voltage enough. The high side was less than 0.65V.
The page below may help you to know more.
http://www.mxcom.net/hearst/motor/mo...tor_eNews.html
I have experienced several cars that turned on the engine check light just once in a while. I mean the car is usually OK without turning on the light but it turns on when going down/up long hill or just running a plain flat road for a long time. These cars were all fixed by changing the O2 sensor. Those aged sensors did not generate the voltage enough. The high side was less than 0.65V.
The page below may help you to know more.
http://www.mxcom.net/hearst/motor/mo...tor_eNews.html
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