RomRaider

Don't use the modified ROM you made just in case something else was changed incorrectly. Through that file away.

That is for a RomRaider def not EcuFlash.

For an EcuFlash def use:

This is where i'm at now. Although still not working.

Starting from scratch
I pasted this into ecuflash A2UI000A.xml and it would show up.



I pasted this in the romraider ecudefs.xml under the A2UI000A section, and it would show up.
<


I edited the offset scaling with romraider saved it and opened it up in ecuflash and the values matched to what I changed it to.
I uploaded the rom, and opened up romraider logger, but the ecu still displays the same value that was there before I changed the offset.

Could it be the wrong address, or am I doing all wrong?

It could be the wrong address although I found a number of other ECUs using the same address for the ATM sensor scaling and the resulting scaled value is used in some lookup tables where ATM is used, such as the front WBO2 sensor compensation and boost compensation.

What values are you changing to?
If you change only the offset then you should see the value move up/down by that value.

When flashing, EcuFlash confirms by checksum that the block containing this address is being reprogrammed?

If you read the ROM back from the ECU, is your changed value still set?

I've tried changing the offset and the multiplier scale, and then read the ROM back from the ecu and the values are what I had changed them to.
The original offset was -2.90 and multiplier 4.83. So looks like it is reading the correct address.

Just that after changing the values I see no change in the reading.

if the car cannot detect the sensor it will display a fixed value. May be you need to check the variable resistor that you have hooked.

when you change the value of the potentiometer any change in the value on the stock scaling?

If there is an ATM sensor fault the ECU will be forced to use the fixed value of 760 Tor (14.69595 psi). This value is applied after the sensor scaling so no matter what you set the scaling values to it won't make a difference on the Logger display.
When the ECU reads the sensor volts it converts the volts to ATM with the scaling values as I defined above. The result is stored at address 0xFF5CDC.
You can hack the Logger def to add this address to see if the value is changing here as you apply different scalings. Of course this does help anything if there's a sensor fault.

Yes when I wind the potentiometer up or down the value changes in the romraider logger.

I think its getting a little above what I've figured out so far.
Isn't the atmospheric pressure address 0x000023, not 0xFF5CDC?

As far as I remember When my sensor was disconnected it was reading lower than 14.69 PSI my idle was -17 PSI (Manifold Pressure Relative(Corrected). when I hooked back the sensor it is ~-10 which is the correct value.

Re-read... "When the ECU reads the sensor volts it converts the volts to ATM with the scaling values as I defined above. The result is stored at address 0xFF5CDC." There's additional processing before it's available at "address 0x000023".

You cannot disconnect the ATM sensor, is it not on the ECU circuit board? There's a separate air pump sensor and logger parameter.

It was my understanding that after a certain year the sensor may have moved to inside the airpump valve to double as a valve open/closed feedback.

My atmospheric pressure is definately in the airpump valve, which is where I have wired my potentiometer to at the moment.
That is why I want to rescale and install a map sensor in there or something, instead of having to buy a whole new valve setup.

Do you know the address to scale the airpump sensor, i'll try that and see if I get a change.

Well I deleted the Air Pump and I had to cut the sensor out of its housing to and connect back to the plug that goes to the ECU harness. I used the car for a couple of days until I was able to cut the sensor.

Yep thats what I would have done except my pressure sensor was playing up.
Are those pictures the ones you've actually taken? Just looks like thats just the valve only having 2 pins. Just thought you may have cut up the wrong valve, since there is 2 of them.

Pretty sure mine has 5 pin, 2 for the valve, 3 for the sensor.

So I reckon the scaling for the atmospheric sensor in the valve is at some other address, but the final atmospheric pressure result is at the usual address, which is why i'm not seeing any change.

Can anyone confirm that theory?
Any ideas on where to change the "valve" atmospheric pressure scaling?

Do you have a wiring diagram of were it connects to the ECU, what pin does it come in on?
The scaling for the Secondary Air Piping Pressure (P244) is at address 0xC0298. You can use the same table def as the ATM sensor and play with the scaling to see what affect it has.

I do see code where the SAP pressure and ATM are intermixed and this is probably where the on-board ATM sensor value is replaced with the SAP reading when the SAP is defined to be installed on the engine. Which means there may be a way to delete the usage of the SAP sensor and get the code to use the on-board ATM sensor instead.