rusefi_documentation/Mazda-Miata-1990.md

# 1990 Mazda Miata

[Frankenso Mazda Miata NA6 PnP](Frankenso-MazdaMiataNA6-pnp)

![Pinout](Images/frankenso_connector_miata_1991.png)

1990 1.6 US

Rusefi Engine Type 41 on Frankenso

## Plug 1

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."

## Plug 3

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 |                              |                                       |

![Wiring Diagram](OEM-Docs/Mazda/1990_Miata/1990_mazda_miata_us_wiring.png)

See also [Mazda ECU Technical Data](https://sites.google.com/site/mazdaecutechnicaldata/)

See you - some notes on stock ECU schematics (TinyCAD format) - [https://drive.google.com/file/d/0B7l1FeMZcfisM3pHanlkWFRGQVU/view?usp=sharing](https://drive.google.com/file/d/0B7l1FeMZcfisM3pHanlkWFRGQVU/view?usp=sharing)

## Gauges

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

![Wiring Diagram](Images/2009-11-10_224518_tach.gif)

See also [http://www.mellens.net/mazda/Mazda-Miata-1991-1993/1991_wiring.pdf](http://www.mellens.net/mazda/Mazda-Miata-1991-1993/1991_wiring.pdf)
Lint (#360) * auto fixes * started fixing * more fixing * lint with gha * and more fixing * and even more fixing * and even more fixing yet * fix home * am idiot * fix workflow name 2023-01-06 17:10:33 -08:00			`# 1990 Mazda Miata`

Fix Links (#89) * fix hyphen links * manual fix * testing * main dir links * other dirs * fix links 2020-08-28 06:02:28 -07:00			`[Frankenso Mazda Miata NA6 PnP](Frankenso-MazdaMiataNA6-pnp)`
Final wiki dump (#87) * a few more pages * a bunch more * rest of the pages * header swap 2020-08-27 14:32:54 -07:00
			`![Pinout](Images/frankenso_connector_miata_1991.png)`

			`1990 1.6 US`

			`Rusefi Engine Type 41 on Frankenso`

			`## Plug 1`
automated md lint fixes 2023-01-02 11:22:23 -08:00
Final wiki dump (#87) * a few more pages * a bunch more * rest of the pages * header swap 2020-08-27 14:32:54 -07:00			`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."`

			`## Plug 3`
automated md lint fixes 2023-01-02 11:22:23 -08:00
Final wiki dump (#87) * a few more pages * a bunch more * rest of the pages * header swap 2020-08-27 14:32:54 -07:00			`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 \| \| \|`

more link fixing 2021-02-16 05:41:05 -08:00			`![Wiring Diagram](OEM-Docs/Mazda/1990_Miata/1990_mazda_miata_us_wiring.png)`
Final wiki dump (#87) * a few more pages * a bunch more * rest of the pages * header swap 2020-08-27 14:32:54 -07:00
convert some links using script, and fix some manually 2022-01-24 17:21:25 -08:00			`See also [Mazda ECU Technical Data](https://sites.google.com/site/mazdaecutechnicaldata/)`
Final wiki dump (#87) * a few more pages * a bunch more * rest of the pages * header swap 2020-08-27 14:32:54 -07:00
convert some links using script, and fix some manually 2022-01-24 17:21:25 -08:00			`See you - some notes on stock ECU schematics (TinyCAD format) - [https://drive.google.com/file/d/0B7l1FeMZcfisM3pHanlkWFRGQVU/view?usp=sharing](https://drive.google.com/file/d/0B7l1FeMZcfisM3pHanlkWFRGQVU/view?usp=sharing)`
Final wiki dump (#87) * a few more pages * a bunch more * rest of the pages * header swap 2020-08-27 14:32:54 -07:00
			`## Gauges`

			`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`

			`![Wiring Diagram](Images/2009-11-10_224518_tach.gif)`

convert some links using script, and fix some manually 2022-01-24 17:21:25 -08:00			`See also [http://www.mellens.net/mazda/Mazda-Miata-1991-1993/1991_wiring.pdf](http://www.mellens.net/mazda/Mazda-Miata-1991-1993/1991_wiring.pdf)`