Vehicle:Mazda Miata 2003 alt

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In RusEFI console, set engine_type 47 loads base settings.

Wiring

http://rusefi.com/wiki/index.php?title=Hardware:OEM_connectors#72_pin

NB2 Miata ECU Connectors Drawing.png

NB2_Miata_ECU_Connectors_Drawing_rusefi_harness.png

Pin STM32 Type Pin RusEFI Pin 64 Conn Pin 72 Conn (NB2) Desc
Spare W1 1A 2P Idle Pos
Switched 12V W2 1B 4AF Main relay Power
Spare W3 1C 4D VVT POS
Spare W4 1D 4S ECU power
Spare W5 1E Spare
PC9 High side driver W6 1F 3F Ignition 1
PE14 High side driver W7 1G 3I Ignition 3
PC7 High side driver W8 1H Spare high
PE10 High side driver W9 1I 3M Alternator
Spare W10 1J Spare
Spare W11 1K Spare
PE8 High side driver W12 1L 3O Tacho/Dizzy
PE12 High side driver W13 1M Spare high
W14 1N Spare
PD8 High side driver W15 1O Spare high
PD9 High side driver W16 1P 2R Check eng
Spare W17 1Q Spare
Spare W18 1R Spare
Spare W19 1S Spare
Spare W20 1T Spare
Spare W21 1U Spare
Spare W22 1V Spare
PA5 CRK 2+ 2A
PA5 Trigger input - CRK 2- 2B 3Y Crank signal
PC6 CAM + 2C
PC6 Trigger input - CAM - 2D 3V Cam signal
Spare W27 2E Spare
Spare W28 2F Spare
PB14 Knock input W29 2G 4K Knock
PB15 Knock input W30 2H
Spare W31 2I Spare
Spare W32 2J Spare
PB12 CAN H /RX W33 2K CAN H
PB6 CAN L /TX W34 2L CAN L
PC13 Low side driver W35 2M 2Q Idle solenoid
PD7 Low side driver W36 2N 3H Main relay
PE5 Low side driver W37 2O 2B Fan
PE6 Low side driver W38 2P Battery Warning light
GND Ground W39 3A 3A Injector Ground
GND Ground W40 3B AFR Ground
GND Ground W41 3C 3B/4A Main ground
GND Sensor ground W42 3D 4O Sensor ground
PC5 Input W43 3E Spare input
PC4 Input W44 3F Baro input
PA7 Input W45 3G Spare input
PA6 Input W46 3H Oil pressure sensor input
PA4 Input W47 3I WIDEBAND IN AFR
PA3 Input W48 3J 4F Spare input (AC in)
5V 5V Vref W49 3K 4L 5V
PA1 Input W50 3L 4I Spare input (clutch)
PA2 Input W51 3M 4V TPS
PC3 Input W52 3N Spare input
PA0 Input W53 3O MAP SENSOR IN MAP
PC1 Input W54 3P 4O IAT
PC2 Input W55 3Q 4P CLT
Spare W56 3R
PE3 Low side driver W57 3S 4R VVT
PE4 Low side driver W58 3T 2M Fuel pump
PD3 Low side driver W59 3U 2K A/C Clutch
PE2 Low side driver W60 3V 2D Inj 2
PB9 Low side driver W61 3W 2A Inj 1
PD5 Low side driver W62 3X 2C A/C Fan
PB8 Low side driver W63 3Y 2G Inj 3
PB7 Low side driver W64 3Z 2J Inj 4

Necessary Modifications

Power

ECU gets +12v from main relay output 4AF which is used as +12v source for VVT (4D) and IAC (2P).

Fly-back diode - stripe facing +12 - is needed between VVT 4D (power, stripe side) and VVT control 4R.

Fly-back diode - stripe facing +12 - is needed between IAC 2P (power, stripe side) and IAC control 2Q.

Vehicle Speed Sensor

Vehicle speed sensor (VSS) should be wired internally to P6. P6 is located on the backside of the board near PA8. From there it can be wired to a spare WXX spot on the RusEFI. The NB2 side pin is 3T.

Air Conditioning

Desc RusEFI Pin NB2 Pin
IN 3J 4F
FAN 1O 2C
OUT 1M 2K

IN represents the switch located in the center console.

FAN represents the output to the fan relay in the engine compartment.

OUT represents the output to the A/C Compressor clutch.