Mazda Miata 1990
1990 1.6 US
Rusefi Engine Type 41 on Frankenso
22 pin
| pos | b pos | color | desc | type |
|---|---|---|---|---|
| 1A | hot all times, Room Fuse | Input +12v | ||
| 1B | White/RED | Main relay | Input +12v | |
| 1C | Violet | Ignition on | Input +12v | |
| 1D | ||||
| 1E | YEL/BLK | Check Engine Light MIL | Output PD5 | |
| 1F | ||||
| 1G | W7? | Igniter 1 & 4 | Output +5v PE14 | |
| 1H | W8 | Igniter 2 & 3 | Output +5v PC7 | |
| 1I | * | * | * | |
| 1J | W10 | BLue/Black | A/C relay | ? |
| 1K | diag connector mode switch TEN | |||
| 1L | N/C | |||
| 1M | N/C | |||
| 1N | ||||
| 1O | stop light switch | input | ||
| 1P | Power Steering SW | |||
| 1Q | AC Thermo SW | |||
| 1R | W18? | BLK/GRN | A/C Extra Cooling Fan Relay | |
| 1S | Heater Control SW | |||
| 1T | ||||
| 1U | Tail Fuse | |||
| 1V |
*** "On a 1990 - 1993 Miata, there are three coolant sensors." "On the top of the thermostat housing at the front of the engine is the 'Water Thermoswitch,' a single-wire sensor that turns the fan on when coolant temperature reaches 207°F (97°C)." "At the rear of the cylinder head is the 'Water Thermosensor.' which sends temperature info to the ECU to help it set A/F ratio."
26 pin
| pos | b pos | color | desc | type |
|---|---|---|---|---|
| 3A | W39 | Ground | ||
| 3B | W40 | Ground | ||
| 3C | W41 | Ground | ||
| 3D | W42 | Ground | ||
| 3E | White | Crank angle #1 | Input PC6 | |
| 3F | * | * | * | |
| 3G | Yellow/BLue | Crank angle #2 | Input, PA5 | |
| 3H | W46? | MAP | Inp10 PA6 | |
| 3I | Tach Input | |||
| 3J | * | * | * | |
| 3K | W49 | LT GRN/RED | +5 ref/TPS power | Output 5v |
| 3L | W50 | LT GRN/WHT | M/T TPS switch | Analog input PA2 |
| 3M | W51 | Red/Black | TPS signal (A/T) | Analog input |
| 3N | W52 | Red/BLue | oxygen sensor | Input PC3 |
| 3O | W53 | Red | VAF/MAF | |
| 3P | W54 | Red/Green | IAT, intake air thermosensor | analog input, 2.7K pull-up, 3.6K? PC1 |
| 3Q | W55 | BLue/White | CLT, water thermosensor | analog input, 2.7K pull-up, 3.6K? PC2 |
| 3R | W56 | * | * | * |
| 3S | W57 | * | * | * |
| 3T | W58 | * | * | * |
| 3U | W59 | Yellow | injector (1&3) | Output/low side |
| 3V | W60 | Yellow/Black | injector (2&4) | Output/low side |
| 3W | W61 | BLue/Orange | Idle Speed Control valve | Output/low side |
| 3X | W62 | White/Blue | purge solenoid valve control | Output |
| 3Y | W63 | * | * | * |
| 3Z | A/T control unit |
See also Mazda ECU Technical Data
See you - some notes on stock ECU schematics (TinyCAD format) - https://drive.google.com/file/d/0B7l1FeMZcfisM3pHanlkWFRGQVU/view?usp=sharing
Useful wires:
CLT B/L Black/Blue Oil Y/A Yellow/? Turn signal Right G/W Green/White Turn signal Left G/B Green/Black
See also http://www.mellens.net/mazda/Mazda-Miata-1991-1993/1991_wiring.pdf
