OTS Maps

To flash an OTS map, select the tab Tune > Flash an MHD Map > Version (if applicable).  You will then see a screen like the following.  There are a few important parts to this screen.

NOTE:  the available OTS stages vary per vehicle / engine.  If your modifications fall outside the common Stages, a custom tune may be necessary.

Navigating the OTS Maps Screen

• Fuel: this toggle simply switches the fuel ratings you see from the USA Octane scale to the RON scale.

• Transmission: if visible, a selection is required.  This will apply the appropriate torque scaling for your vehicle’s transmission.

• Stage: you should select the appropriate stage for the level of modification of your vehicle.  The recommended mods for each are always listed underneath the stage name.

Stage Fuel: this bar is tappable separate from the Stage button itself.  Use this to select the actual octane / RON fuel you will be using with the Stage map.  NOTE: available fuel options will vary between stages.

Open

OTS Maps Process Overview

1. At the top of the OTS Maps screen you should first set the OCT/RON toggle to the format you are used to.

2. Next, if the Transmission selection is visible, a choice is required (you will not be able to proceed past this screen without choosing one).  Tap it and you will see a popup appear similar to this one.  The available transmission options specific to the vehicle you are flashing, so your list may vary.  This choice is remembered within MHD going forward.

3. Next, determine the correct Stage in the list per your vehicle’s modifications.  You must also own the Map Pack license for this Stage (or the Super License).

4. Now, in the Stage Fuel bar, tap the appropriate fuel type that you will be using in the vehicle.  If you do not see a certain fuel (like full E85) available, it is likely because the OEM fuel system would not support it.

5. Next, tap the Stage button itself (anywhere outside the Stage Fuel bar works) to proceed to the next screen, the MHD Flash screen.

6. Once at the MHD Flash screen, you can either flash the map as-is, or tap Options to adjust the available Flash Options (these are detailed in their respective section below).  There are three different flash lengths you will see:

   1. Full Write: this is the longest initial write, which installs MHD for the first time.      NOTE: a battery charger is recommended for this! (if not using MHD Black Wifi adapter)

   2. Long Write: this is triggered when you are adding or removing a flash option that contains custom code / logic we have developed at MHD.  It is shorter than a full write but depending on your connection, a battery charger is recommended.

   3. Map Write: this is a very short write, like changing from Stage 1 to Stage 2, etc.

7. Once your flash options are configured, PLEASE DOUBLE CHECK THE FOLLOWING: 

   1. Ignition is in the “Ignition On”, but “Engine Off” state.  To achieve this, press the engine start button without pressing the brake / clutch, until the dashboard shows the fuel level.

      1. G-Series and later vehicles must press the “engine start” button 3x quickly to enter into diagnostic mode as displayed on the dashboard.  Do not press the brake / clutch to ensure the car does not start.

   2. All cabin accessories, climate controls, and headlights are turned off.

   3. Battery charger is connected if doing a Full or Long write.

   4. Device is in Airplane Mode + WiFi enabled! (if using WiFi adapter)

   5. Ensure CarPlay is turned off completely. (iOS)

8. Tap the Write button and MHD will begin to flash the vehicle!

   1. During this time, do not open the windows, do not open the doors, do not turn on anything else in the vehicle as it may interrupt the flashing process.

   2. During this time, you may hear a series of chimes as well as the fuel pump running.  You may also see a few iDrive error messages.  Do not worry, as this is normal.

9. Once the map is flashed, MHD will put the car into “Normal Operation”, clear codes, and restore coding.  After this, it will ask you to turn the ignition off.

10. Turn off ignition completely, remove key FOB from slot (if applicable), and wait a minimum of 30 seconds before starting the car!  The “Service Car” icon may be illuminated for part of this, that is fine.

Congratulations!  You have just flashed your first MHD OTS Tune!