przemhb

civil-zz:

quote (przemhb) The "Yaw Sensor Calibration" did not help. Should I expect it to help? yes

I have replaced the combined sensor with an other one. It returns about 1.6-1.8 deg/sec according to FORScan readings. I have tried to calibrate it using "Yaw Sensor Calibration", but it did not succeed too. It still reads 1.6-1.8deg/sec.
The sensor type is: 3M5T-14B296-AB (typical for Focus II).

(Please take a look at my previous post too; I have replied there to your questions).

Thank you civil-zz for your reply and support.

When I start "Yaw Sensor Calibration" in ELMConfig I guess it sends some commands/requests to BCM or the sensor itself, right?
I have Mazda 3 BK 2004, so the BCM and sensor are the same as in FF2.
In Mazda 3 BK Workshop Manual they do not use term "calibration" when refering to combined sensor, but "initialization". The initialization is said to be required after the sensor was removed and installed/replaced.
As my yaw rate sensor returns 3,20 - 3,40 deg/sec when my car is stopped I assume initialization could help to zero the offset value.
I connect using ELM327 and FORScan and display PIDs from ABS module: YAW_RATE(°/sec), LAT_ACCL(G), ESP_VOLT and others.
I have a plot of the YAW_RATE - take a look here:

From the Workshop Manual:

"COMBINED SENSOR INITIALIZATION PROCEDURE

1. Inspect the wheel alignment and the tire pressure.
• If there is any malfunction, adjust the applicable part.
2. Position the vehicle on level ground.
3. Turn the ignition switch off.
4. Connect the M-MDS to the DLC-2.
5. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

• When using the IDS (laptop PC)
1. Select "Chassis".
2. Select "ABS/DSC".
3. Select "Sensor Initialization".

• When using the PDS (Pocket PC)
1. Select "Module Tests".
2. Select "ABS".
3. Select "DataLogger".
4. Select "LATACCEL.:'.
/ there is no point 5 in the procedure here /
6. Perform the initialization procedure according to the directions on the screen.
7. Drive the vehicle.
8. After 5 min or more of driving, verify that the DSC system is normal."

As you see the procedure ask to select LATACCEL. This is why I have thought it may be a command name. But the name is not important here. What is important is what it does.

I am wondering if ELMConfig is performing the same procedure (as described in the manual) and why it did not zeroed my YAW_RATE value?
Have you got any idea?

Hi guys,

ELMConfig has "Yaw Sensor Calibration" in BCM. Could someone (maybe civil-zz) tell me:

1. What command(s) does it send? Is it "LATACCEL"? (at least it is so called in Mazda 3 service manual)
2. My combined sensor returns YAW_RATE value of approximately 3,2 deg/sec when my car is steady, not moving. It should return zero.
The "Yaw Sensor Calibration" did not help. Should I expect it to help?

Привет,

Мой русский очень плохо, так что я перевел это в Google Translate.

ELMConfig имеет "Yaw Sensor Calibration" в BCM. Может кто-то (может быть, гражданско-ZZ) скажите мне:

1. Какая команда (ы) это послать? Это "LATACCEL"? (по крайней мере, это так называемый в Mazda 3 прошивками)
2. Мои Объединенные Датчик возвращается YAW_RATE значение примерно 3,2 град / сек, когда мой автомобиль устойчив, не двигаясь. Она должна возвращать ноль.
"Отклонение калибровки датчика" не поможет. Должен ли я ожидать, что она поможет?

-
привет из Польши
przemhb

Hi guys,

ELMConfig has "Yaw Sensor Calibration" in BCM. Could someone (maybe civil-zz) tell me:

1. What command(s) does it send? Is it "LATACCEL"? (at least it is so called in Mazda 3 service manual)
2. My combined sensor returns YAW_RATE value of approximately 3,2 deg/sec when my car is steady, not moving. It should return zero.
The "Yaw Sensor Calibration" did not help. Should I expect it to help?

--
greetings from Poland
przemhb