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#1
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM
I have replaced the front heated oxygen sensor with a Mazda new unit to
fix a fault consistent with the P1135 indicator and I have cleared the engine code/CEL. However, whenever I wind up the engine above 4000 RPMs, the engine light, the P1135 code and 2 sensor indicators (whatever that is) come up up again. I have searched the net for equivalent failure modes and I can find some cases when this has occurred, but it appears that people have not posted the subsequent solution. The engine does not run rough at all at any RPM and there is no lost of engine power. The P1135 code is the only one that gets triggered. This is a bit confusing, since other failures associated with the coil, etc. triggered other codes in some of the web postings I have read. Is this an indicator of problems in the VICS, the coil pack, the EGR/ducting or what? Unless the new Mazda OEM front O2 sensor is also bad, I think the P1135 indicator is a mis-mapping of some other fault cause. Thanks for any help or follow on discussion. Zoom, zoom, zoom. :-\ Roland (original owner Miata 2000 SE, 48,000 miles, one year old NGK plugs and cables, good battery, everything else is original) |
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#2
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM
P1135
H02S11 Heater Circuit Low (From my scanner Mazda code list) DTC 1135 from 99 Miata Shop Manual PCM voltage is below 5.8v when no power is supplied during 322-327 sec after engine start to heated front O2 sensor.(From Shop Manual) ??? if no power is supplied, how can it have 5.8 v or any voltage for that matter?? Possible causes Wrong sensor heater resistance heater value or shorting wire to sensor? I'd (on a 99) check the voltage between ECU(PCM) pin 1U and the ignition switch and the sensor C pin Also, grounding may be a problem. The harness side of the connector pin layout is Long index to the top, short index on bottom and each side. ____ - A-C- B-D - "Rho" > wrote in message t... > I have replaced the front heated oxygen sensor with a Mazda new unit to > fix a fault consistent with the P1135 indicator and I have cleared the > engine code/CEL. However, whenever I wind up the engine above 4000 RPMs, > the engine light, the P1135 code and 2 sensor indicators (whatever that > is) come up up again. I have searched the net for equivalent failure > modes and I can find some cases when this has occurred, but it appears > that people have not posted the subsequent solution. The engine does not > run rough at all at any RPM and there is no lost of engine power. The > P1135 code is the only one that gets triggered. This is a bit confusing, > since other failures associated with the coil, etc. triggered other > codes in some of the web postings I have read. > > Is this an indicator of problems in the VICS, the coil pack, the > EGR/ducting or what? Unless the new Mazda OEM front O2 sensor is also > bad, I think the P1135 indicator is a mis-mapping of some other fault > cause. > > Thanks for any help or follow on discussion. > > Zoom, zoom, zoom. :-\ > > Roland > (original owner Miata 2000 SE, 48,000 miles, one year old NGK plugs and > cables, good battery, everything else is original) |
#3
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM
"Chuck" > wrote:
>P1135 >H02S11 Heater Circuit Low (From my scanner Mazda code list) >DTC 1135 from 99 Miata Shop Manual >PCM voltage is below 5.8v when no power is supplied during 322-327 sec after >engine start to heated front O2 sensor.(From Shop Manual) >??? if no power is supplied, how can it have 5.8 v or any voltage for that >matter?? I would guess that the PCM does get a signal from the sensor (it says PCM voltage,) while there is no heater voltage (or evidence of one, maybe.) Or maybe the opposite way around. >Possible causes >Wrong sensor heater resistance heater value or shorting wire to sensor? >I'd (on a 99) check the voltage between ECU(PCM) pin 1U and the ignition >switch and the sensor C pin >Also, grounding may be a problem. Yes, or the wiring harness, maybe. The OP says he has replaced the oxygen sensor with a new Mazda unit. Maybe the problem was not with the O2 sensor to start with? I don't know about a 99, but on a 96 that is one dirty, hot area. Come to think of it, I guess it is hot on any car. Vibration makes poor contact unusable. PCM takes offense at being slighted. Problem solved except for confirmation. OK, I do not really have a clue, but follow on discussion was requested. ) Leon >The harness side of the connector pin layout is Long index to the top, >short index on bottom and each side. > ____ >- A-C- > B-D > - > >"Rho" > wrote in message et... >> I have replaced the front heated oxygen sensor with a Mazda new unit to >> fix a fault consistent with the P1135 indicator and I have cleared the >> engine code/CEL. However, whenever I wind up the engine above 4000 RPMs, >> the engine light, the P1135 code and 2 sensor indicators (whatever that >> is) come up up again. I have searched the net for equivalent failure >> modes and I can find some cases when this has occurred, but it appears >> that people have not posted the subsequent solution. The engine does not >> run rough at all at any RPM and there is no lost of engine power. The >> P1135 code is the only one that gets triggered. This is a bit confusing, >> since other failures associated with the coil, etc. triggered other >> codes in some of the web postings I have read. >> >> Is this an indicator of problems in the VICS, the coil pack, the >> EGR/ducting or what? Unless the new Mazda OEM front O2 sensor is also >> bad, I think the P1135 indicator is a mis-mapping of some other fault >> cause. >> >> Thanks for any help or follow on discussion. >> >> Zoom, zoom, zoom. :-\ >> >> Roland >> (original owner Miata 2000 SE, 48,000 miles, one year old NGK plugs and >> cables, good battery, everything else is original) > -- Leon van Dommelen Bess, the Miata Bozo, the Miata http://www.dommelen.net/miata The only thing better than a white Miata is two white Miatas |
#4
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM --update, or lack of it
Update on the original posting.
Work has interfered with diversions, so I have not devoted much time to this lately. The Miata is my toy car, so it is aging nicely in the garage. Before I got distracted, I did spray cleaned (with connector cleaner) and reseted two harness connectors that I think are on the harness line from the O2 sensor to some actuator that I think it may be related to the VICS stuff. This is all from the back side of the cams cover to the rear top side right side of the engine. I do not have schematics, so I do not know what connects to what (computer, actuator, etc.). No improvement. The connectors are well set and secured. I would venture to guess that contact discontinuity due to vibration is not likely in this 2000 configuration. It is hot in the area behind the block, but I can trigger the problem with the engine block cold if I rev. it up. The problem does not occur at RPM lowers than 4500 or 5000. I could run the car for miles at the lower RPMs without triggering the engine light to go off. My guess it that the O2 sensor error is a red herring, but I have no idea what is signal flow in this engine management. So, I will break out the electrical multimeter next to check wiring continuity and levels. If any one knows of a good technical descriptions of engine management for Mazda, it would be welcome. Thanks for the replies so far. I know the answer will be trivial once it is revealed. |
#5
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM -- update, or lack of it
Rho > wrote:
> I do not have schematics, Well, let's FIX that, OK? http://www.madracki.com/miata/ Scroll down until you see Wiring Diagrams toward the bottom of the page, click on it, select your year and get them. You'll need Adobe Reader to read them. -- XS11E, Killing all posts from Google Groups The Usenet Improvement Project: http://blinkynet.net/comp/uip5.html |
#6
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM --...
Interesting thread. I came here to post a question and started reading
this one :-). Bottom line, will the car pass your local smog test?? And does the light go out when you are under that 4000 RPM threshold?? |
#7
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM --...
First reply:
Many thanks to "xs11e" for the link to http://www.madracki.com/miata/ !! It prints clearly despite the small fonts. I assume that a text description of the operations related to diagram B-1a (Engine Control System) on page Z-18 of file 001_2000wire.pdf would be too much to ask in life? :-) I suspect that a mode transition at high RPM (solenoids to VICS, ignition coil 1 vs 2 use, etc.) may be at fault here. It may be that the O2 sensor is (and was) actually working right, but the ignition process saturates the sensor on those peak rev-up instants ?????? Thanks again. Second reply: The car is not likely to pass smog test since on the bi-annual test next year the car has to go on the "thredmill". Any instantaneous reving-up of the engine will set the engine light, even if the cause it not part of the test cycle. The light gets set by the event and it has to be cleared manually (via the reader, BTN1 fuse removal or ground battery disconnect). I suspect after the RPM go down, there is no instantaneous error condition, but I do not know because the engine light does not auto-clear in my case. As I understand it, the implementation of many engine light faults auto-clears only after a large number (e.g., >40) of engine on-start-off cycles with no faults. I drove 80 miles yesterday not reving the engine past 4300 RPM or so. No event. Today I instantaneously reved the engine to about 4800 RPM or so and it triggered. However, I rather look at traffic on the freeway than my tach when this happens, so I may not have the numbers exactly at the maximum levels. It is very repeatable. rm |
#8
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM --update, or lack of it
Page 13 of file oodtc.pdf at
http://www.madracki.com/miata/images/wiring/00dtc.pdf contains a list of possible causes and test sequence. Thanks. XS11E wrote: > Rho > wrote: > >> I do not have schematics, > > Well, let's FIX that, OK? > > http://www.madracki.com/miata/ > > Scroll down until you see Wiring Diagrams toward the bottom of the > page, click on it, select your year and get them. You'll need Adobe > Reader to read them. > > |
#9
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM -- update, or lack of it
Does the VIC rod move when the engine is started?
In reality, the ECU should care less if the VICS actually operates, as long as the solenoid operates. There is no sensor that can tell if long or short passages are selected. My book shows operation at ~5300, not 4800 (I really don't know what the reality is. I'd look to see if the battery voltage is at least 14.2 volts or so when the problem occurs. Unfortunately, the service manual has a long sequence using the dealer tester to force testing modes to diagnose VICS problems. "rho" > wrote in message . net... > Page 13 of file oodtc.pdf at > http://www.madracki.com/miata/images/wiring/00dtc.pdf > contains a list of possible causes and test sequence. > > Thanks. > > > > XS11E wrote: > > Rho > wrote: > > > >> I do not have schematics, > > > > Well, let's FIX that, OK? > > > > http://www.madracki.com/miata/ > > > > Scroll down until you see Wiring Diagrams toward the bottom of the > > page, click on it, select your year and get them. You'll need Adobe > > Reader to read them. > > > > |
#10
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Re-occurring P1135 engine code on Miata 2000 above 4000 RPM --update, or lack of it
Chuck wrote:
> Does the VIC rod move when the engine is started? ==> Yes, it does move. > My book shows operation at ~5300, not 4800 (I really don't know what the > reality is. ==> Problem happens at open throttle near 4500 RPM onwards. It is an RPM and throttle combination, the best I can tell now after a few more runs. ==> Air filter, plugs and plug cables are relatively new (<5000 miles). ==> Fuel filter is original (12000 miles before recommended change), but there is no hesitation at open throttle. > > I'd look to see if the battery voltage is at least 14.2 volts or so when the > problem occurs. ==> Can not measure it when the problem occurs, but it appears nominal engine off and engine on at idle. Battery is relatively new and there is no charge problem. > > ...... ==> The new front O2 sensor heater resistances is nominal (in retrospect inspection, so was the old). Voltage level to the heater element is nominal. I have not gotten to the connectors to the PCM yet. ==> The car appears to be working normally otherwise, even at full throttle. I am not sure that there is even an emission problem since it is just an instantaneous fault that appears not to occur over 95%+ of the driving time. The error code is still P1135. I have a while until I have to inspect it again. I may have to take it to Mazda service so that they can fix their own system and/or get it to pass inspection. ==> I do not have a good history with Mazda service departments. So I was trying to avoid that experience again. It took many visits around 2001 to get them to fix a grinding and blocking 6-speed transmission on this same car that I bought new. They tried to fix it the first time and that was worst. Finally they replaced the gear box. They were very reluctant to approve any warranty work. It may be that some harness cable to the PCM got pinched due to these repairs and they finally failed. Who knows. Mazda makes some interesting cars, but their service has been mainly concerned with reducing cost to them rather than maintaining customer satisfaction, at least in my prior warranty repair case. However, once the customer is paying, the amount of work they are willing to bill is tops. Other than for the transmission being bad from the factory at the onset, I had no other non-maintenance repairs until now (48,000 miles). My only regret is that I may have to deal with Mazda service again. That is why I was trying at least to troubleshoot the problem. ==> Thanks to all for the suggestions. When I get a final resolution, I will post the outcome. |
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