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#4143 of 9235 Re: bug by bluong1 Dec 04, 2003 (12:57 am)
OK, for your convenience here is the report posted in another forum:   "I just got a cel on my Mazda 3 sport yesterday [11/30] after 300km, still on its first tank of gas. I took it in to Mazda and they hooked it up to their computer and said I didn't let the car warm up long enough... The cel came on again today after warming up the car for 5 minutes. The temperature was about 2 degrees outside today. The cel doesn’t go off either, they have to reset it. The service department said they will look in to it."   "I just took my car in again today [12/03] and the second cel was the same (drove away before vehicle was warm). My dealer phoned Mazda Canada and they said there are already quite a few complaints of the same problem. They said that the computer needs to be reprogrammed (flashed) and each dealer will get a CD to do this. I believe it just affects one of the sensors and only in colder climates. I have to drive around now with a cel for up to a month but they said its not doing any damage."   I agree with Dinu, the explanation "engine too cold" is BS. But Dealer do all the time this kind of talking when they have no clue about the problem. (Do you think they would say: oh we have no clue, so please don't worry and ignore the warning light!)   However, the dealer seems to be more serious as reported in the second post. They would not tell this if they weren't sure they can "correct" the problem. A CA dealer on the forum told that a CD came last week, and the next one is due in two months. But there is something still fishy about the second post: if the bug were entirely from the program, then why would they mention about the sensor?   I suspect that either the dealer or Mazda-CA indeed discovers that the root problem is the sensor X wasn't working proprely/wrongly calibrated. They might have just upload a program to disable the sensor in question before implementing a definitive solution (which could be either hardware or soft, who knows, and it takes definitive longer as Preston points out). Now the question is: this problem is global or just for this vehicule? I honnesly don't know.   Now the entire thread might just BS as well, it's possible. But then we have to blame the Mazda dealer who reports BS to its costumers.
#4144 of 9235 C&D, redline etc... by bluong1 Dec 04, 2003 (2:45 am)
First I detect not only one but four (well three) discrepancies between the spec given by C&D and Mazda.   1- The steering turn lock-to-lock is stated 2.8 by C&D and 2.9 by Mazda.   2- C&D says the car weight is 2957 lb whereas the EPA curb weight given by Mazda is 2826 lb (5-door, MT). Big difference, I'm not aware that the leather seats are that heavy.   3- C&D states the height correctly, but they says the car height is similar to Protegé5. Wrong! The Protegé5 is 4.5 cm lower. Only with the roof rack that they have the same height (this has been discussed here before).   4- C&D says the redline is 7100 rpm, but then their picture shows the tach redline clearly at 6500 rpm.   There are two explanations for the last issue: a) the drawing redline on the tach is 6500 rpm, differently set than the true rev limiter which set at 7100 rpm. b) the tach is inaccuratelly report the real engine RPM.   I don't believe Mazda does a). To me the hypothesis b) is more plausiblee I have followed close up the engine RPM problem, reported by many P5 owners, and an innacuracy of 5-10% between the tach reading and the true RPM is very common. Actually, there is a fellow who test droves the Mazda3-AT and he told that the car can rev up to 7500 rpm! IMO, the rev limiter/true red line is at 6500 rpm, and the tach simply over-reads. It seems C&D reports the reading RPM when it hits the rev limiter during their acceleration tests, I doubt they bother to plug in an electronic diagnostic device in order to read the true engine RPM.   I wonder why Mazda set the redline of the N/A 2.3L engine at 6500 RPM, this engine has potential to rev more, it's barely reach the max power at 6500 rpm.
#4145 of 9235 Preston: CEL issue on the Mazda6 by bluong1 Dec 04, 2003 (3:00 am)
Here is a post on the CEL from Mark who obviously knows what he is talking about:   When the OBD II mandates hit the manufactures in the mid-ninties one of the monitored functions was to check the integrity of the "evaporative emission control system". The check is based on the theory that many cars where letting fuel evaporate due to loose or missing fuel caps, and the evaporating fuel was damaging the ozone layer.   Since 1994 most manufacturers have used the VBE or "vacuum based evap" check that requires the vehicle to be at normal operating temp and the car be in"cruise mode". This systems parameters caused a concern with the EPA. Some cars never get full warm up and some cars never get to "cruise mode". VBE used vacuum, which is a by-product of gasoline engines. After the vehicle parameters are met (if ever) the the PCM commands a valve to open and allow the fuel tank to evacuated. A sensor in the tank picks up the vacuum signal and the PCM sets an internal timer. When the PCM re-checks the sensor after a given amount of time and the vacuum is gone the system flags a loose gas cap code PO442/456 for a small leak or a PO455 for a large leak.   Coffee time...(this should count for like five posts)   Now for the latest and greatest.   Mazda has been tasked from the Ford family to pioneer the PBE or "Pressure Based Evap" system.The newest requirement is to monitor leaks smaller than .020 inch. The system is a self contained system first used on the 02 MPV but used on every Mz6. A Small(6"x6") module is mounted near the fuel tank of the vehicle. Each module contains a small pump and a COV(Change over valve). The COV is a three way valve. Position 1) is vented to atmosphere. Position 2) is a .020 orifice. Position 3)is to the fuel tank.   Every time the vehicle is turned off the PCM commands the pump to run. the PCM monitors the amperage in the curcuit and take this as a "base line" reading. The PCM them commands the COV to move to the .020 orifice position and the amperage in the system is evaluated and the two readings are stored. The COV is then commanded to send pressure to the fuel tank..the Pcm then times how long it takes to go from the "no load " reading to the "full load" reading (.020) and if the specified time is exceeded a code is set.   Wow. Lotsa tech here. I'm not making this up.   The system on the Mz6 had two problems initally. 1)If the owner was filling the vehicle with fuel and the test was running...PO455 large leak. 2) If the owner used the remote to lock the doors while the test was running, the door lock motors caused a drain on the battery and the time for the test never made the specified time.   The re-flash on the Mz6 tells the PCM to ignore failed test unless it is failed more than twice.   Thats all I got to say about that.
#4146 of 9235 Auto sport use by 1davao Dec 04, 2003 (3:01 am)
Can somebody please explain how to use the + and - in the manual mode of automatic M3 and when to use it in the fly? And also when not to use it. Thanks
#4147 of 9235 Auto sport use by 1davao Dec 04, 2003 (3:03 am)
OOps sorry! wrong board.
#4148 of 9235 PCM timing by longing4mz3 Dec 04, 2003 (5:26 am)
bluong,    I wonder, after power off how long pcm will be doing PBE stuff?.
#4149 of 9235 Hummm by bluong1 Dec 04, 2003 (5:45 am)
I don't know. It shouldn't last too long, probably one or two seconds (?). Why you need to know the time? Any Mazda6 owner can tell?
#4150 of 9235 1davao by dinu01 Dec 04, 2003 (5:46 am)
Why is it the wrong board?   You can use it ALL the time.   Do NOT downshift to 1 while the car is at 20km/h or above - the tranny and engine will tell you they don't like this. Try to match the revs with the proper gear to avoid unnecessary strain (ie: don't shift into the wrong gear and don't leave your car in 4th when you should be in 2nd - pointless)   You have to upshift for yourself as the Mazda SportAT won't do it otherwise - it'll just bounce you off the rev limiter.   The SportAT will always put you in 1st once you come to a complete stop. The car is VERY quiet. Don't forget to upshift   Dinu
#4151 of 9235 EVAP by bluong1 Dec 04, 2003 (5:57 am)
here is an article on EVAP   http://www.findarticles.com/cf_dls/m0BQA/1_81/82551559/p1/article- .jhtml
#4152 of 9235 reason for pcm pbe stuff qtn.. by longing4mz3 Dec 04, 2003 (6:16 am)
bluong,     To delay the remote locking after closing the door

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