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MegaShift™ V4.114 Code

This code is currently a βeta version; and is for testing purposes only. Use great caution if testing in a vehicle (and only test in a vehicle after verifying the operation on the bench all of the functions you are using). Check this page often if you are testing this code - it will be updated without notice.

The MegaShift™ V4.114 S19 file is here:

Note: When in bootloader mode, the GPIO allows a full 12V to flow in the TCC and Output3 (aka. TCC, SolC) circuits. If your set-up depends on PWM to limit the current in these solenoids, you MUST pull the 5 Amp fuse to these solenoids (shown in this wiring diagram) before entering bootloader mode to load new code. The 4L60E does not need to have the fuse pulled in bootloader mode.

The accompanying INI file you will need for your tuning software is below. Do NOT rely on the INI that comes with your tuning software, even if it has the correct version number it may be out of date and not have the latest updates and corrections.

This INI fully supports the 'context menu help' feature added in TunerStudioMS versions 1.30 and up.

The tuning software guide to all the tuning parameters in the V4.114 code is here: V41tune.html

Dependencies: MShift™ v4.1xx code requires 2.905 MS-II™/MicroSquirt®/Sequencer™ code (or higher, including msextra code) for CAN compatibility (3.5xx code or higher will also work).

Compared to the V2.200 code, this MShift™ code adds:

• Spare port 0 is implemented on the speedo output. User can choose to use this output as:
  0. Speedo Output: This gives a signal for an electronic speedometer that is proportional to (but slower than) the VSS output. User can enter pulse/mile value (2002 pulses per mile, 4004 pulses per mile, etc.).
  1. Pulse Width Modulation (PWM) Output: User can choose 'always ON' 'On only while shifting' or 'ON only during shift'.
  2. Torque Converter Clutch (TCC) Output: On whenever TCC is activated, OFF other wise.
  3. Shift Solenoid: Use as the eighth (8th) shift solenoid (to change gears).
  4. Selective Clutch: Activate only on user selected upshifts or downshifts. Off when not shifting.
  The spare port 0 ON state is determined from the user settable 16x9 PWM table in all modes except 'Speedo Output'. The user can select the axis parameters from Load (MAP or TPS), Speed, RPM, or Temperature. The spare port 0 OFF state is a single user settable value.
• User can set a dead band on the voltage based lever input (www.msgpio.com/manuals/mshift/V4tune.html#i).

Loading Code on Your MShift™ Controller

To use the downloader.exe:

1. Power down the MShift™/GPIO Controller,

2. Put the boot jumper on both pins of the header marked JP5 (for "bootloader") near the serial plug on the GPIO board,

3. Power up the MShift™/GPIO Controller by connecting the power supply ground on one of the Ampseal pins 18, 19, 20 (through the appropriate lead). Then apply 12 volts (nominal, 9V to 15V is okay) to Ampseal pin 1.
   Note: When in bootloader mode, the GPIO allows a full 12V to flow in the TCC and Output3 (aka. SolC, 3/2sol) circuits. If your set-up depends on PWM to limit the current in these solenoids, you MUST pull the 5 Amp fuse to these solenoids (shown in this wiring diagram) before entering bootloader mode to load new code. The 4L60E does not need to have the fuse pulled in bootloader mode.

4. Start the downloader program (get it here), and select the appropriate COM port number for your serial connection (if you don't know your serial COM port, run the portCheck program),

5. Select the appropriate .S19 file, and the downloader will read, write and verify the code to the processor in about 10 seconds or so.

6. The process ends with a message like "Verification succeeded, XXX records total (4 skipped)." (where XXX is a large number that varies from one code version to the next),

7. Shut down the downloader program,

8. Remove power from the MShift™/GPIO Controller,

9. Remove the boot jumper (or put it on just one pin of the boot header for storage),

10. Start the tuning software (TunerStudioMS) and set the COM port and speed if necessary. Open the project Properties dialog, and point to the INI file you downloaded above. To set up a CAN pass-through connection with TunerStudioMS, see this video: CAN set-up video (22 MBytes)

Once you have loaded the code, you need to create a project in TunerStudioMS using the INI file above:

• Direct connection to GPIO serial port: go to the 'File/Project/Project Properties', click 'Other' check box and select the INI file you have downloaded above.

• CAN Pass-through connection from MS-II: Open your MS-II project, then add your GPIO/MShift™ to the CAN Devices ('File/Project/Project Properties/Can Devices') and select the above INI file for the 'device configuration file'. Set the CAN ID as well (the MShift™ code has CAN ID = 1 as a default).

  Here is a video on setting up the CAN pass-through in TunerStudioMS: CAN set-up video (22 MBytes)

Old Code/Ini can be found here: