EU3 MAF timeout disable

Posted: 
Tuesday, January 8, 2019 - 10:45

I've had a few requests for details on how to disable the timeout on EU3 maps when the MAF sensor is disconnected.
Without this mod the throttle on EU3 maps is unresponsive for 20-30 seconds when the engine is first started.

It's quite simple to do by altering the MAF "out of range" timeout check from a conditional "if timeout branch" to an unconditional "branch".

You'll need to use a HEX editor for this.

First open up you .map file in your favorite hex editor - I use Hex Fiend on macOS for stuff like this.

With the .map open search for a sequence of hex bytes: 66 30 31

Unmodified .map

There should be only one occurrence of this sequence in the .map file at an offset of somewhere around 0xD100 - 0xD400.

Next, change the 66 to 60 - this alters the conditional branch instruction to an unconditional branch, meaning the ECU always executes the "no MAF" code.

Modifed .map file

Save the modified .map file and you are done.

Be aware that this mod “lobotomizes" the EU3 maps to a EU2 style single smoke map configuration.
The ECU will only use the main high range smoke map (map 60).

This should work for all EU3 variants.
If you can't locate the byte sequence let me know which variant you are working with.

randomness