2001 Milly S - ABS Brake TCS TCS Off lights on no speedo/odo
 

Car runs fine, not in limp mode, trans seems ok, good grounds, good fuses, new battery. Car has correct 52k miles.


Codes are: P0500, P1720, P1524, P1455


No ABS specific codes.


I replaced the vehicle speed sensor with no change, checked related wiring and no chafes, broken wires/bad connections.


The 0500 & 1720 point to VSS circuit malfunction - what else comprises this circuit?


Is there also an output speed sensor on this model year? If so where is it?


I will deal with the 1524 when I get this other issue resolved.


What else could be causing this? Ideas??


Thanks!


Joe

Diagnostic Code of p1455 Fuel Tank Level Sensor - FixYa

https://www.mazdaforum.com/forum/maz...r-p1524-26593/

The other issues sound like a faulty ECM since you have already replaced the VSS.
OBD-II Trouble Code: P0500 Vehicle Speed Sensor Malfunction

1524 is map sensor? i dont think so. from where did you pull this WRONG dtc? 1524 is cac bypass solenoid circuit. and ecm(mazda calls this pcm) never go bad on the millenia. a wild guess here is grounds. 1524 means you have a 2.3. on the rear bank, right next to the egr valve is a row of solenoids. right there is a ground connector. it is bolted down by a 10 x 6mm bolt. try disconnect/clean all the terminals, and see if that helps. and if you are going to keep the car, get a fsm, dont depend on these others who give wild guesses that will lead you in the wrong direction

Ken inn,

Rechecked and cleaned all grounds. I also added another 4g ground wire from ground connector mentioned above to chassis. Unfortunately none of the ground work helped.

I hear you on the FSM - good idea and will look into that.

Any other ideas on what to try next?

Thanks!!

Joe

Swapped in a used ABS/trans control unit (under drivers side dash) with no effect on the issues. At a complete loss and this is driving me crazy and beating up my wallet.

Did I get a bad VSS sensor? It was purchased new from Rockauto...
PCM next?
Would the module on ABS pump cause this?
Anything in the transmission itself?

TIA

Joe

Fixed ABS
 

Fixed. It turned out to be the ABS controller. I was able to swap it without pulling the pump so it saved me a lot of work not having to bleed the entire system.

In the 2001/02 cars the wheel sensors feed signal to the ABS controller which in turn feeds signal to the dash. This is compared against the VSS signal in the PCM which feeds trans controller. There is no output speed sensor on this generation. Don't know why the ABS scan didnt pick up the controller issue or if it did the dealer never mentioned it.

Now on to the 1524...I have replaced all of the hoses on the rear bank of solenoids and am moving on to the top of the motor. Need to do valve cover gaskets and plugs so a crapload of work still in front of me. Fun times.

excellent. and nice to post the fix, which generally no one does. this helps in future problems

So can you please tell us which soze those vacuum hoses are ? ( getting tcs&tcs off lights & 14-17-82 as abs fault codes)

Help
 

Help do you know the part number for the part that you said fixed your car I have the 2002 Milly S 2.3l supercharged. You called it a ABS Controller. Thank you on advance James