TSB questions
#1
Driver School Candidate
Thread Starter
Join Date: Oct 2011
Location: Sterling, VA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
TSB questions
I know no question is supposed to be a dumb one but I don't understand can anyone explain the Technical Service Bulletins? I came across something in my OCD-like research that refers to A/F and O2 sensors and Threshold Values and sensor ID but I don't know what that means. There was also an ECU Programming procedure that may not be relevant.
2000 Lexus Truck RX 300 AWD V6-3.0L (1MZ-FE) Recall and Technical Service Bulletin Titles
TSB Number & Issue Date TSB Title
http://www.alldatadiy.com/TSB/74/00740506.html
Again, sorry if I'm asking a question that's already been answered. But I know I'm not the only one going in circles regarding these sensors and I just want to make sure there isn't something I'm missing regarding these Bulletins. Clearly something is going on with my car and it's 0171 error but this guesswork is like playing darts blindfolded in a crowded room.
2000 Lexus Truck RX 300 AWD V6-3.0L (1MZ-FE) Recall and Technical Service Bulletin Titles
TSB Number & Issue Date TSB Title
SB0188-09 DEC 09 Engine Controls - A/F And O2 Sensor Identification
SS002-03 DEC 03 Engine Controls - O2 Sensor Monitor Threshold Values
SS001R-01 SEP 03 Engine Controls - ECU Programming Procedure
I know there is a post elsewhere regarding the bulletins but here is a link with recent TSB, which even has something referencing key casing. SS002-03 DEC 03 Engine Controls - O2 Sensor Monitor Threshold Values
SS001R-01 SEP 03 Engine Controls - ECU Programming Procedure
http://www.alldatadiy.com/TSB/74/00740506.html
Again, sorry if I'm asking a question that's already been answered. But I know I'm not the only one going in circles regarding these sensors and I just want to make sure there isn't something I'm missing regarding these Bulletins. Clearly something is going on with my car and it's 0171 error but this guesswork is like playing darts blindfolded in a crowded room.
#3
I know no question is supposed to be a dumb one but I don't understand can anyone explain the Technical Service Bulletins? I came across something in my OCD-like research that refers to A/F and O2 sensors and Threshold Values and sensor ID but I don't know what that means. There was also an ECU Programming procedure that may not be relevant.
2000 Lexus Truck RX 300 AWD V6-3.0L (1MZ-FE) Recall and Technical Service Bulletin Titles
TSB Number & Issue Date TSB Title
http://www.alldatadiy.com/TSB/74/00740506.html
Again, sorry if I'm asking a question that's already been answered. But I know I'm not the only one going in circles regarding these sensors and I just want to make sure there isn't something I'm missing regarding these Bulletins. Clearly something is going on with my car and it's 0171 error but this guesswork is like playing darts blindfolded in a crowded room.
2000 Lexus Truck RX 300 AWD V6-3.0L (1MZ-FE) Recall and Technical Service Bulletin Titles
TSB Number & Issue Date TSB Title
SB0188-09 DEC 09 Engine Controls - A/F And O2 Sensor Identification
SS002-03 DEC 03 Engine Controls - O2 Sensor Monitor Threshold Values
SS001R-01 SEP 03 Engine Controls - ECU Programming Procedure
I know there is a post elsewhere regarding the bulletins but here is a link with recent TSB, which even has something referencing key casing. SS002-03 DEC 03 Engine Controls - O2 Sensor Monitor Threshold Values
SS001R-01 SEP 03 Engine Controls - ECU Programming Procedure
http://www.alldatadiy.com/TSB/74/00740506.html
Again, sorry if I'm asking a question that's already been answered. But I know I'm not the only one going in circles regarding these sensors and I just want to make sure there isn't something I'm missing regarding these Bulletins. Clearly something is going on with my car and it's 0171 error but this guesswork is like playing darts blindfolded in a crowded room.
Last edited by artbuc; 01-15-12 at 07:57 AM.
#4
Driver School Candidate
Thread Starter
Join Date: Oct 2011
Location: Sterling, VA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
So in theory if there is something that was done to correct the A/F sensor readings - it looks like the same Bank 1 sensor was replaced by the dealer in 06. And if you didn't have an extended warranty how would the '09 Bulletin apply? Not trying to be a PITA just curious.
Also if there had been something that they had fixed in ECU but then I had battery issues (twice) would that totally wipe out any updates?
As for the MAF sensor i couldn't get it unplugged. so I cleaned it as best i could but now based on further reading I'm guessing it's not really cleaned.
I've had multiple sensor errors come up since last spring but the 0171 (a lean fuel bank) is always there. So my belief is that it's still the calculation causing the bad readings or slow circuit not actually bad sensors.
(i'm not a mechanic - I just pretend to know what I'm talking about)...
Kimberly
Also if there had been something that they had fixed in ECU but then I had battery issues (twice) would that totally wipe out any updates?
As for the MAF sensor i couldn't get it unplugged. so I cleaned it as best i could but now based on further reading I'm guessing it's not really cleaned.
I've had multiple sensor errors come up since last spring but the 0171 (a lean fuel bank) is always there. So my belief is that it's still the calculation causing the bad readings or slow circuit not actually bad sensors.
(i'm not a mechanic - I just pretend to know what I'm talking about)...
Kimberly
#5
So in theory if there is something that was done to correct the A/F sensor readings - it looks like the same Bank 1 sensor was replaced by the dealer in 06. And if you didn't have an extended warranty how would the '09 Bulletin apply? Not trying to be a PITA just curious.
Also if there had been something that they had fixed in ECU but then I had battery issues (twice) would that totally wipe out any updates?
As for the MAF sensor i couldn't get it unplugged. so I cleaned it as best i could but now based on further reading I'm guessing it's not really cleaned.
I've had multiple sensor errors come up since last spring but the 0171 (a lean fuel bank) is always there. So my belief is that it's still the calculation causing the bad readings or slow circuit not actually bad sensors.
(i'm not a mechanic - I just pretend to know what I'm talking about)...
Kimberly
Also if there had been something that they had fixed in ECU but then I had battery issues (twice) would that totally wipe out any updates?
As for the MAF sensor i couldn't get it unplugged. so I cleaned it as best i could but now based on further reading I'm guessing it's not really cleaned.
I've had multiple sensor errors come up since last spring but the 0171 (a lean fuel bank) is always there. So my belief is that it's still the calculation causing the bad readings or slow circuit not actually bad sensors.
(i'm not a mechanic - I just pretend to know what I'm talking about)...
Kimberly
#6
Driver School Candidate
Thread Starter
Join Date: Oct 2011
Location: Sterling, VA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
I took the MAF Sensor off again and it was fairly clean compared to the first time but I was still unable to actually unplug the sensor. I used CRC MAF Sensor Cleaner and put towels under it since I couldn't get it off. I let it dry. I stuck nothing down it either time.
I put it back on and made sure it was positioned well and tight. Also I noticed that the hose clamp behind it was loose so i tightened that as well.
I cleared the codes and was hopeful as I left for errands. Still tripped the CEL as soon as I braked once.
I will see about the PCV and figure out how to actually get the MAF sensor off but in that other thread I was trying to get an idea of what the A/F Sensor Voltage is supposed to be in Bank 1 position 1 and 2 as well as the 02 Voltage since mine the Bank 1/1 is reading 0.4-0.8 and the bank 1/2 is in the 3.3 + range (the O2 is similar).
I don't know if that's normal or 'lazy' like you said and means just replace the bank 1 sensor.
I've tried to find the right readings for them and just found generic info.
Off to Sears for tools that I don't have .
I put it back on and made sure it was positioned well and tight. Also I noticed that the hose clamp behind it was loose so i tightened that as well.
I cleared the codes and was hopeful as I left for errands. Still tripped the CEL as soon as I braked once.
I will see about the PCV and figure out how to actually get the MAF sensor off but in that other thread I was trying to get an idea of what the A/F Sensor Voltage is supposed to be in Bank 1 position 1 and 2 as well as the 02 Voltage since mine the Bank 1/1 is reading 0.4-0.8 and the bank 1/2 is in the 3.3 + range (the O2 is similar).
I don't know if that's normal or 'lazy' like you said and means just replace the bank 1 sensor.
I've tried to find the right readings for them and just found generic info.
Off to Sears for tools that I don't have .
#7
I took the MAF Sensor off again and it was fairly clean compared to the first time but I was still unable to actually unplug the sensor. I used CRC MAF Sensor Cleaner and put towels under it since I couldn't get it off. I let it dry. I stuck nothing down it either time.
I put it back on and made sure it was positioned well and tight. Also I noticed that the hose clamp behind it was loose so i tightened that as well.
I cleared the codes and was hopeful as I left for errands. Still tripped the CEL as soon as I braked once.
I will see about the PCV and figure out how to actually get the MAF sensor off but in that other thread I was trying to get an idea of what the A/F Sensor Voltage is supposed to be in Bank 1 position 1 and 2 as well as the 02 Voltage since mine the Bank 1/1 is reading 0.4-0.8 and the bank 1/2 is in the 3.3 + range (the O2 is similar).
I don't know if that's normal or 'lazy' like you said and means just replace the bank 1 sensor.
I've tried to find the right readings for them and just found generic info.
Off to Sears for tools that I don't have .
I put it back on and made sure it was positioned well and tight. Also I noticed that the hose clamp behind it was loose so i tightened that as well.
I cleared the codes and was hopeful as I left for errands. Still tripped the CEL as soon as I braked once.
I will see about the PCV and figure out how to actually get the MAF sensor off but in that other thread I was trying to get an idea of what the A/F Sensor Voltage is supposed to be in Bank 1 position 1 and 2 as well as the 02 Voltage since mine the Bank 1/1 is reading 0.4-0.8 and the bank 1/2 is in the 3.3 + range (the O2 is similar).
I don't know if that's normal or 'lazy' like you said and means just replace the bank 1 sensor.
I've tried to find the right readings for them and just found generic info.
Off to Sears for tools that I don't have .
Here is some good info re A/F and O2 sensors:
www.autoshop101.com/forms/h37.pdf
Your voltage measurements are confusing. Bank1Sensor1 and Bank2Sensor1 are A/F sensors; Bank1Sensor2 is an O2 sensor. Are you getting about 3.3 volts on both A/F sensors?
Last edited by artbuc; 01-15-12 at 03:53 PM.
Trending Topics
#8
Driver School Candidate
Thread Starter
Join Date: Oct 2011
Location: Sterling, VA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
I thought I had answered that I understood how to clean the MAF other than I could not get it off after I took the screws out. The red diodes looked fine and i stuck nothing up there when I sprayed the cleaner. If I missed something in the instructions that I read then I'm all ears.
I still ONLY get an 0171 error sometimes twice. Sometimes I don't bother clearing the CEL since it doesn't matter.
I trip 0171 every time I drive - it is just a matter of when. It may be the first time I decelerate and or brake or it may be 30 min/miles into my drive before I'm not allowed to go into overdrive. It doesn't matter if I've cleared the code or not - the behavior is the same and I haven't been able to determine the trigger since the Actron I bought only does live data - doesn't actually allow for download.
In the past I have had the knock sensor in bank 1 the same as 0171. But I think that goes off because the fuel is lean and it's a secondary error when I was accelerating uphill. It also doesn't return when I clear the codes.
As for the readings - I typed them just like they were displayed on the Actron I didn't realize it was just an expensive a code reader for what it really does.
I'm pretty sure based on what I've read and what's already been replaced that this is an open circuit issue with the bank 1 A/F sensor and it triggering the lean fuel.
Anyway once it's replace along with the spark plugs I'll let everyone know.
I still ONLY get an 0171 error sometimes twice. Sometimes I don't bother clearing the CEL since it doesn't matter.
I trip 0171 every time I drive - it is just a matter of when. It may be the first time I decelerate and or brake or it may be 30 min/miles into my drive before I'm not allowed to go into overdrive. It doesn't matter if I've cleared the code or not - the behavior is the same and I haven't been able to determine the trigger since the Actron I bought only does live data - doesn't actually allow for download.
In the past I have had the knock sensor in bank 1 the same as 0171. But I think that goes off because the fuel is lean and it's a secondary error when I was accelerating uphill. It also doesn't return when I clear the codes.
As for the readings - I typed them just like they were displayed on the Actron I didn't realize it was just an expensive a code reader for what it really does.
I'm pretty sure based on what I've read and what's already been replaced that this is an open circuit issue with the bank 1 A/F sensor and it triggering the lean fuel.
Anyway once it's replace along with the spark plugs I'll let everyone know.
#9
I thought I had answered that I understood how to clean the MAF other than I could not get it off after I took the screws out. The red diodes looked fine and i stuck nothing up there when I sprayed the cleaner. If I missed something in the instructions that I read then I'm all ears.
I still ONLY get an 0171 error sometimes twice. Sometimes I don't bother clearing the CEL since it doesn't matter.
I trip 0171 every time I drive - it is just a matter of when. It may be the first time I decelerate and or brake or it may be 30 min/miles into my drive before I'm not allowed to go into overdrive. It doesn't matter if I've cleared the code or not - the behavior is the same and I haven't been able to determine the trigger since the Actron I bought only does live data - doesn't actually allow for download.
In the past I have had the knock sensor in bank 1 the same as 0171. But I think that goes off because the fuel is lean and it's a secondary error when I was accelerating uphill. It also doesn't return when I clear the codes.
As for the readings - I typed them just like they were displayed on the Actron I didn't realize it was just an expensive a code reader for what it really does.
I'm pretty sure based on what I've read and what's already been replaced that this is an open circuit issue with the bank 1 A/F sensor and it triggering the lean fuel.
Anyway once it's replace along with the spark plugs I'll let everyone know.
I still ONLY get an 0171 error sometimes twice. Sometimes I don't bother clearing the CEL since it doesn't matter.
I trip 0171 every time I drive - it is just a matter of when. It may be the first time I decelerate and or brake or it may be 30 min/miles into my drive before I'm not allowed to go into overdrive. It doesn't matter if I've cleared the code or not - the behavior is the same and I haven't been able to determine the trigger since the Actron I bought only does live data - doesn't actually allow for download.
In the past I have had the knock sensor in bank 1 the same as 0171. But I think that goes off because the fuel is lean and it's a secondary error when I was accelerating uphill. It also doesn't return when I clear the codes.
As for the readings - I typed them just like they were displayed on the Actron I didn't realize it was just an expensive a code reader for what it really does.
I'm pretty sure based on what I've read and what's already been replaced that this is an open circuit issue with the bank 1 A/F sensor and it triggering the lean fuel.
Anyway once it's replace along with the spark plugs I'll let everyone know.
#10
Lexus Test Driver
It may be time to just go ahead and replace the maf sensor outright. But then again that would be throwing parts at it, and that's not something you should do.
Maf sensors can go bad, and sometimes cleaning it won't help.
Maf sensors can go bad, and sometimes cleaning it won't help.
#11
Driver School Candidate
Thread Starter
Join Date: Oct 2011
Location: Sterling, VA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
That's what I was trying to prevent... (since now I have my 92 Prelude that is going to require body and unknown mechanical work all out of pocket...
I found an example of our MAF sensor and other than the fact that I can't get mine UNPLUGGED! ergg... that's pretty much what I did.. though I am aware that the light doesn't just 'go off...
Anyway, we'll see how today goes... it's 21 degrees here and I'm really regretting cutting off the air vents to my garage at the moment (though it was a code violation). So I'm procrastinating a little bit.
I found an example of our MAF sensor and other than the fact that I can't get mine UNPLUGGED! ergg... that's pretty much what I did.. though I am aware that the light doesn't just 'go off...
Anyway, we'll see how today goes... it's 21 degrees here and I'm really regretting cutting off the air vents to my garage at the moment (though it was a code violation). So I'm procrastinating a little bit.
#12
Driver School Candidate
Thread Starter
Join Date: Oct 2011
Location: Sterling, VA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Will be interested in your outcome. If your B1S1 was .4-.8 volts something is wrong. However, I suspect that reading was from B1S2 which would be correct. In any event, I have never heard of a bad A/F sensor which didn't throw its own code but that doesn't necessarily mean it has never happened. OTOH, there are many examples of faulty MAF sensors which have symptoms exactly like yours. Good luck and keep fuel supply on your list of potential suspects..
Bank 1 Sensor 2 are anywhere from 0.020-0.9 and the mechanic has replaced twice.
What seems' to happen is that there is a slow response between the two sensors ... I saw on the dealers page that Sensor 1 was replaced in 2006 but seems to me they should have both been done at the same time. Bank 1 Sensor1 stays drops as low as 2.7 to 3.5 and I don't know if somewhere between the two is where the 'slow' circuit response is which is what triggers the lean fuel.
One other thing when I redid the MAF Sensor and tightened the hose clamp last night I noticed that if I revved the engine it no longer had that initial hesitation.
Last edited by kford1040; 01-16-12 at 10:38 AM. Reason: Updated readings since cleaning the MAF Sensor
#13
Measure the resistance of the af sensors if you google it you will find wht they should be but if it is 0 or open then its bad. but if you have a bad af sensor ud have alot more then just a code.
So for maf sensor squeeze the tab very hard and try pulling off while maf is screwed into box still. also look up iacv cleaning try that. make sure theres no vacume hoses leaking like the hose behing airintake box that comes off alot good luck
So for maf sensor squeeze the tab very hard and try pulling off while maf is screwed into box still. also look up iacv cleaning try that. make sure theres no vacume hoses leaking like the hose behing airintake box that comes off alot good luck
#14
Bank 1 Sensor 2 are anywhere from 0.2-0.9 and the mechanic has replaced twice.
What seems' to happen is that there is a slow response between the two sensors ... I saw on the dealers page that Sensor 1 was replaced in 2006 but seems to me they should have both been done at the same time. Sensor 1 stays +/- 3.3 and I don't know if somewhere between the two is where the 'slow' circuit response is which is what triggers the lean fuel.
One other thing when I redid the MAF Sensor and tightened the hose clamp last night I noticed that if I revved the engine it no longer had that initial hesitation.
What seems' to happen is that there is a slow response between the two sensors ... I saw on the dealers page that Sensor 1 was replaced in 2006 but seems to me they should have both been done at the same time. Sensor 1 stays +/- 3.3 and I don't know if somewhere between the two is where the 'slow' circuit response is which is what triggers the lean fuel.
One other thing when I redid the MAF Sensor and tightened the hose clamp last night I noticed that if I revved the engine it no longer had that initial hesitation.
Also, absolutely no need to replace both A/F sensors just because one is bad.
#15
Driver School Candidate
Thread Starter
Join Date: Oct 2011
Location: Sterling, VA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Well just want to say I have no idea what these readings are but I'm not getting an error code but my mpg is now at 9.....
My bank 1 a/f 2 fluctuated as low as 0.030-0.8x
Bank 1 a/f 1 dropped 2.7-3.33
I went maybe ten miles.
Just thought I would throw that in the mix.
My bank 1 a/f 2 fluctuated as low as 0.030-0.8x
Bank 1 a/f 1 dropped 2.7-3.33
I went maybe ten miles.
Just thought I would throw that in the mix.
Thread
Thread Starter
Forum
Replies
Last Post
VSsc400
RX - 1st Gen (1999-2003)
4
08-26-04 09:16 AM