Mazda Rotary Club

Ive got the heat sensor warning permantl ylit  on the dash. The previous owner said it was the cat sensor (its decat) everything looks good on the apexi so it sounds about right.

Do i need to go hunting under the car for this wire and try and ground it. Or is there somewhere easier to access this wire without lifting it up?

What does the knock reading show on the Apexi? I think the PFC uses the heat light as a knock warning

Ill check the knock tomorrow. But i read that if its knock it will flash and not be on straight from starting

Quote from: anthony;835098Ill check the knock tomorrow. But i read that if its knock it will flash and not be on straight from starting

I have  a PFC series 1

During mapping mine came on (flashing ) to indicate Knock .....have not seen it again .......dont think it should be on permanently   tbh .....hope this helps.:confused:

Do a sensor check on the pfc comander , see if the fuel temp sensor is marked
Prob that. Unless the wires are off the cat heat sensor

The knock is just a level not digits? I switched to print diguts.It was around 120 or 180 peak. Idling around 40?

All the sensors were marked last time i checked. Ill check again tonight.
I believe its just the cat sensor as thats what the previous owner stated.. Is there an easy way to tell and get to it!

Quote from: anthony;835132The knock is just a level not digits? I switched to print diguts.It was around 120 or 180 peak. Idling around 40?

All the sensors were marked last time i checked. Ill check again tonight.
I believe its just the cat sensor as thats what the previous owner stated.. Is there an easy way to tell and get to it!

Cat sensor is under the car near centre section, or you may have to remove driver seat and see if it is plugged in still
Under the carpet near trans  tunnel .

Quote from: TRIND-FD;835147Cat sensor is under the car near centre section, or you may have to remove driver seat and see if it is plugged in still
Under the carpet near trans  tunnel .

^^this^^ if the sensor is faulty just join the two wires together.

looks like it\'s just the cat sensor

Unrelated but that air temp voltage looks high, what are your air temps in monitor?

(http://i1072.photobucket.com/albums/w364/aletchet/6847826c.jpg)

Was about 37 at first traffic light.  then 19ish when going in to garage. Then took that pic after i stopped.

What controls that air temp?

The air temp sensor (AIT) is under the UIM near the bulkhead.
There is a quicker reacting one (RIAT), as the standard one is pretty slow, you can get the RIAT on eBay or from a Triumph motorbike dealer.
They are about £25-£30.

Phil

Is it worth getting?

Quote from: anthony;835132The knock is just a level not digits? I switched to print diguts.It was around 120 or 180 peak. Idling around 40?

All the sensors were marked last time i checked. Ill check again tonight.
I believe its just the cat sensor as thats what the previous owner stated.. Is there an easy way to tell and get to it!

Your knock level is a lot higher than I ever get. The highest its ever been is 70. It should be flashing the warning above 60. What injector duty cycles are you peaking at? Has this car been mapped for all the mods to give you peace of mind? If you press the right arrow on your commander, it will hold the peak values until you switch the ignition off.

Where would it flash a warning for the knock? If its the heat led then that is up the hole time from what i believe to be the cat which is why i want it fixed :)

The car was mapped by john on fduk before i bought it.
How do i see the injector duty? Im sure i didnt see that  under  monitir?

Sort the heat light prob, you know what\'s what now, short the two wires or fit sensor, not a hard job,  1hr max

Quote from: TRIND-FD;835254Sort the heat light prob, you know what\'s what now, short the two wires or fit sensor, not a hard job,  1hr max

What he ^ says. The warning light is the exhaust heat warning light. You will need to short it otherwise it will stay on all the time. If your car was correctly mapped using a wideband then you can rest easy. The knock sensor is just a glorified microphone and different cars will have different readings depending on the mods. Injector duty cycles can reassure you that you are not maxing out your injectors and possibly leaning out. On the monitor you can choose the parameters to be displayed or you can display up to 8 parameters. There is a manual for the commander somewhere online. Google is your friend on this matter as I cannot remember off the top of my head how to navigate the commander (the double rum and coke I had earlier are not helping). I can post a link to the manual tommorrow, if you cannot find it.

Quote from: anthony;835245Is it worth getting?

Defo worth getting. When your engine is heat soaked the air temps go high and the timing is retarded upto 6 degrees to prevent det( unless someone changed it during mapping) your timing won\'t be getting retarded.
The RIAT sensor is so much faster and will be cheaper than a new mazda one.

Why is the vacuum only at -29mmHg, shouldn\'t it be closer to 5-600 when its stopped?

Quote from: m1tch;835273Why is the vacuum only at -29mmHg, shouldn\'t it be closer to 5-600 when its stopped?

No, it should be at 0 with the engine off but the calibration is slightly out which is quite common and nothing to worry about, it\'s only for a reference.

(http://i1072.photobucket.com/albums/w364/aletchet/cf6b4b97.jpg)

This was after a 5 min journey under 3000rpm. So the knock sensor output looks wrong. Would anyone worry about this and get a specialist to take a look? Dodgy sensir?

Should get some time to fix the heat sensor next week, then that will be another tick off the liat.