I am building a PCB v3.0 that I bought from DIYAutorune with a MS3 and a MS3X. I plan to use it to replace the ECU of my 2003 Miata.

I am following the build instructions of the MS3X/V3.0 Hardware Guide and I am also using this web page:

How to MegaSquirt your Mazda Miata

I just stumbled on pictures of Westfield MX5 01-05 board and it's quite different from what I have build. It's missing half the components and R13 is connected in the same hole as R45.

Am I following the right instructions? I would like to have a confirmation that I am on the right track...

Here is what I build so far (it's not finished):


Westfield MX5 board:

 

The MS3X board takes care of a lot of those missing components. But you're not hurting anything installing them.

 

the one thing you should do is remove R13 and install a 1K resistor there but going down to the next resistor as shown in Frank's pic.

Then make sure your jumpers are setup for the VR input circuit (youre missing one)

and you need to install MOV1 and R40 and Q22 and Q23.

 

Thanks!

Is replacing R13 with a 1K resistor and connecting it as in Frank`s pic the same as connecting a 1K resistor on a wire from the 5V hole above the proto area to TachSelect (from How to MegaSquirt your Mazda Miata)

 

correct. the left hole of r13 is 5v so that's providing the pull up to tachselect.

 

I finished the board, installed the formware and now TunerStudio is able to connect to it

I searched for a MS3 2003 base map and did not find anything. Anyone has one?

I have some 550cc injector from my WRX lying around. As far as I can tell, they would fit the Miata with 12mm extender like these:

Extender: "Bright-Magenta" - SPORT COMPACT, 12 mm w/o clip - Fuel Injector Connectors - Bosch Electrical Connectors & Denso Connector Adapters - IMP12X w/o FUEL RAIL RETAINER

Any reason not to use them?

 

my basemap might not match your inputs and outputs depending how you built the harness.

 

I finally had time to try the map today and I get a bunch of error when I import the MSQ:



56 Warnings:
Warning: MSQ Units Mismatch for knk_tadv! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for idleadvance_delay! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: Value in .msq '"Off"' for parameter: spk_conf2_tfi is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: MSQ Units Mismatch for IACcrankxt! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for pwmidle_shift_open_time! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: Value in .msq '"16x16"' for parameter: feature4_0VEtblsize is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: MSQ Units Mismatch for knk_trtd! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for ego_startdelay! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for boost_ctl_lowerlimit! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for idleve_delay! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for pwmidle_pid_wait_timer! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: Parameter in .msq, but not valid for current firmware: No options found for Bit EcuParameter:vss_opt2 equal to the proposed Off
Warning: MSQ Units Mismatch for ac_delay_since_last_on! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: Value in .msq '"Off"' for parameter: spk_conf2_gm is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: Parameter in .msq, but not valid for current firmware: No options found for Bit EcuParameter:vss2_an equal to the proposed Off
Warning: Parameter in .msq, but not valid for current firmware: No options found for Bit EcuParameter:water_pins_pump equal to the proposed Off
Warning: MSQ Units Mismatch for fc_ego_delay! s found in current configuration, seconds found in MSQ, values were not converted to new units.
Warning: Value in .msq '"Off"' for parameter: spk_conf2_ngc is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: MSQ Units Mismatch for pwmidle_close_delay! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: Parameter in .msq, but not valid for current firmware: No options found for Bit EcuParameter:IdleCtl equal to the proposed PWM Closed-loop
Warning: Parameter in .msq, but not valid for current firmware: No options found for Bit EcuParameter:vss1_an equal to the proposed Off
Warning: MSQ Units Mismatch for pwmidle_targ_ramptime! s found in current configuration, sec found in MSQ, values were not converted to new units.
Warning: Parameter in .msq, but not valid for current firmware: No options found for Bit EcuParameter:MAFOption equal to the proposed Off
Warning: MSQ Units Mismatch for boost_ctl_lowerlimit2! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: shift_cut_rpm45 row:0, col:0, One or more value higher than maximum: 10000.0, Set to the maximum value: 9000.0
Warning: shift_cut_rpm34 row:0, col:0, One or more value higher than maximum: 10000.0, Set to the maximum value: 9000.0
Warning: shift_cut_rpm23 row:0, col:0, One or more value higher than maximum: 10000.0, Set to the maximum value: 9000.0
Warning: shift_cut_rpm12 row:0, col:0, One or more value higher than maximum: 10000.0, Set to the maximum value: 9000.0
Warning: Failed to set value for timedout1_offdelay .msq value is not valid for current configuration: timedout1_offdelay loaded size larger than configured size. Data truncated.
Warning: Value in .msq '"On-Off"' for parameter: pwm_opt_var_f is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: Value in .msq '"On-Off"' for parameter: pwm_opt_var_e is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: Value in .msq '"On-Off"' for parameter: pwm_opt_var_b is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: Value in .msq '"Variable"' for parameter: pwm_opt_var_a is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: Value in .msq '"On-Off"' for parameter: pwm_opt_var_d is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: Value in .msq '"On-Off"' for parameter: pwm_opt_var_c is of a type that is not compatible with the current firmware.This will be ignored, please correct manually.
Warning: shift_cut_rpm56 row:0, col:0, One or more value higher than maximum: 10000.0, Set to the maximum value: 9000.0
Warning: accel_CLT_multiplier row:0, col:0, One or more value below minimum: 20.0, Set to the minimum value: 100.0
Warning: MSQ Units Mismatch for RotarySplitLoad! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for inj_trim_load! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for amap_table2! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for amap_table1! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for TauAcc! ms found in current configuration, msec found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for spk_trim_load! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for TauDec! ms found in current configuration, msec found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for fmap_table1! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for fmap_table2! INVALID found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for fmap_table3! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for smap_table1! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for smap_table2! INVALID found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for smap_table3! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for EAESOCKPAbins2! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for EAEAWCKPAbins2! kPa found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for fmap_table4! INVALID found in current configuration, % found in MSQ, values were not converted to new units.
Warning: MSQ Units Mismatch for smap_table4! INVALID found in current configuration, % found in MSQ, values were not converted to new units.
Warning: dualfuel_press row:0, col:0, One or more value below minimum: 20.0, Set to the minimum value: 70.0
Warning: MSQ Units Mismatch for psEnabled! found in current configuration, on/off found in MSQ, values were not converted to new units.