This is info DD helped me with earlier, so I thought I would post it in case it can help someone else. In the MED9 FR correctly, it says on Page 3097 of MED9.1 FR that you have to set BIT 3 to true (=1) in word CWKHZW in order for the ECU to use KFZWMNST during a start. So how do you do this? You just use binary form of the 8 bit word CWKHZW, and set the third bit to 1?


So, if CWKHZW starts out as 0, then the new setting would be = 0 0 0 0 1 0 0 0 = 8

It starts out as 1 in the OEM file.

Isn't the 3rd bit should be the 3rd bit regardless of the original value? Or is BIT 3 different depending on the original value?

This is how an OEM word looks (if I have the right address for the codeword).

Oh I see, sorry my bad. I set BIT 1 to 0 to turn off cat heating first. I guess I should have mentioned that. 

But here is the funny thing, if I leave BIT 3 false, then modify the KFZWMNST map to make the car behave different. The car still behaves different even though the map should be inactive.

Can someone verify if my address for CWKHZW and KFZWMNST are correct for 115G SW 389075?
CWKHZW Map 1C8E58

KFZWMNST Map 1DA53E
X Axis 1CA686
Y Axis 1C90EC

It is much easier to say add 8 to stock value (as it effectively just set bit 8 if it was unset). Unfortunately it is not 100% safe because in case the bit was already set adding 8 would unset bit 3 and set bit 4. The only proper way is to convert stock value to binary, change the bit configuration as needed and convert back to decimal/hexadecimal (it depends what you need).