2020-08-28 06:02:28 -07:00
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[72 pin Connector](OEM-connectors#72-pin)
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2020-08-27 14:32:54 -07:00
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2020-08-28 06:02:28 -07:00
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See also [Mazda Miata 2003 alt](Mazda-Miata-2003-alt)
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2020-08-27 14:32:54 -07:00
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2020-08-28 06:02:28 -07:00
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For power see [Mazda Miata 2002 - Starting & Power](Mazda-Miata-2002#starting--power)
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2020-08-27 14:32:54 -07:00
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Coil three wire plug:
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middle wire GND
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pin closer to the engine is +12v
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pin further away from the engine signal
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## Plug 1 (ECU connector #2)
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"rusEfi harness" does not mean much - that's just the way I bundle 4-5 wires together on my cars
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| pos | color | desc | type | rusEfi harness |
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| --- | ------------ | ------------------- | --------------------------------- | --------------- |
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| 2A | Yellow/Black | Injector \#1 | | orange Y1 |
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| 2B | Red/Yellow | Engine radiator fan | | orange B4 |
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| 2C | Blue/White | AC radiator fan | | |
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| 2D | Violet/Green | Injector \#2 | | blue Y1 |
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| 2E | Light Green | EGR Valve \#1 Coil | | |
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| 2F | White/Green | EGR Valve \#2 Coil | | |
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| 2G | Yellow/Red | Injector \#3 | | white Y1 |
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| 2H | Pink/Black | EGR Valve \#3 Coil | | |
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| 2I | Pink | EGR Valve \#4 Coil | | |
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| 2J | Yellow/Green | Injector \#4 | | green Y1 |
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| 2K | | A/C Relay | | |
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| 2L | | NA | Does not exist | |
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| 2M | Red/White | Fuel Pump Relay | | red B4 |
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| 2N | | VTCS Control | | |
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| 2O | | NC | | |
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| 2P | Orange | IAC (positive) idle | \+12v wired to main relay via 4AF | red, short wire |
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| 2Q | Violet/Red | IAC (negative) idle | low-side with diode | blue b4 |
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| 2R | White/Blue | MIL Control | low-side | white Y1 |
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## Plug 2 (ECU Connector #3)
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| pos | color | desc | type | rusEfi harness |
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| --- | ------------ | ------------------------- | ----------------------------------- | ------------------------ |
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| 3A | Black | Injector GND | ground | black Y1 |
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| 3B | Black/Red | PCM (ECU) GND | ground | black W4, sliced for MAP |
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| 3C | Green/Yello | Purge Control Solenoid | | |
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| 3D | | EGR Boost sens. sol. | | |
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| 3E | | CDCV Control | (Evap canister?) | |
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| 3F | Brown/White | Coil \#1 | (cylinder 1 & 4) | white B4 |
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| 3G | | NA | Does not exist | |
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| 3H | | Main relay control | Low-side output | white or red, R5 |
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| 3I | Black/Yellow | Coil \#2 | (cylinder 2 & 3) | orange B4 |
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| 3J | Black/Orange | Front O2 sens. heater GND | Presumably switched to GND in 'run' | |
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| 3K | | NC | | |
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| 3L | | NC | | |
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| 3M | Grey/Red | Alternator field ctrl. | PWM signal to control voltage | orange R5 |
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| 3N | | NC | | |
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| 3O | Green/Orange | Tach OUT | Drives tachometer | green B4 |
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| 3P | White/Black | Rear O2 sens. Signal | | |
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| 3Q | Green/White | K-Line (serial comm.) | Probably goes to OBDII | |
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| 3R | | NA | Does not exist | |
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| 3S | | Immobilizer comm. | | |
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| 3T | | VSS in | | blue W3 |
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| 3U | | Alternator warn. light | | |
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| 3V | | Camshaft Sensor | | blue W3 |
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| 3W | | NC | | |
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| 3X | | NC | | |
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| 3Y | | Crankshaft Sensor | | white W3 |
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| 3Z | | NC | | |
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## Plug 3 (ECU Connector #4)
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| pos | color | desc | type | rusEfi harness |
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| --- | ------------- | -------------------------- | --------------------------------------------- | ---------------------- |
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| 4A | Black/Blue | GND | ground | black W4 |
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| 4B | | Brake Switch | | |
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| 4C | | Power Steering Switch | (Presumably used for 'Idle Up') | |
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| 4D | Yellow | VVT Oil Control Valve pos. | \+12v wired to main relay via 4AF, short wire | |
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| 4E | | DTM switching | (Diagnostic Terminal?) | |
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| 4F | | AC Pressure In | | |
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| 4G | | NA | Does not exist | |
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| 4H | | Neutral Switch | | |
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| 4I | | Clutch Switch | | |
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| 4J | | VTCS ca. switch | | |
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| 4K | | NC | | |
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| 4L | Lt GRN / RED | Sensor +5V | | red W3, sliced for MAP |
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| 4M | | Knock sens. in | | white R5 |
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| 4N | | IAT Sensor | | green B2 |
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| 4O | BLK / RED | Sensor GND | ground | black B2 |
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| 4P | Red/Blue | CLT Sensor | | blue B2 |
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| 4Q | | NA | Does not esist | |
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| 4R | Violet/Yellow | VVT Oil Control Valve neg. | low-side driver | white B2 |
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| 4S | Black/White | \+12V engine fuse 15A | ECU power source, run/start | red B2 |
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| 4T | | Alternator output voltage | (seems to be feedback from alt.) | |
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| 4U | | NC | extra main relay for diode | red, short wire |
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| 4V | Green/Black | TPS Sensor output | | green B2 |
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| 4W | | Front O2 Sensor Signal | | |
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| 4X | Pink | MAF Sensor | | orange B2 |
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| 4Y | | NA | Does not exist | |
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| 4Z | Pink/Black | ECU - TCM | Communication for A/T | |
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| 4AA | Red | Rear O2 Sensor | | |
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| 4AB | | FTP Sensor | Fuel Tank Pressure | |
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| 4AC | | ECU - TCM | Communication for A/T | |
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| 4AD | | Fuel Level Sensor | | |
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| 4AE | | EGR Boost Pressure Sensor | | |
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| 4AF | white/Red | \+12v from main relay | | red, short wire |
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| 4AG | Blue/Red | Bat+ (Hot all times) | 12v 10A fuse from battery | |
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| 4AH | | Evap | | |
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| desc | type | rusEfi harness |
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| ---------- | ------ | -------------- |
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| MAP signal | analog | blue |
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| AFR signal | analog | white |
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2020-08-28 08:48:19 -07:00
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2020-08-27 14:32:54 -07:00
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Individual pages for printing:
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2020-08-28 08:48:19 -07:00
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2020-08-27 14:32:54 -07:00
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2021-01-01 15:51:02 -08:00
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2020-08-27 14:32:54 -07:00
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2021-01-01 15:51:02 -08:00
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2020-08-27 14:32:54 -07:00
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## Automatic Transmission
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2020-08-28 06:02:28 -07:00
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see [Mazda Miata 2001 - Automatic Transmission](Mazda-Miata-2001#automatic-transmission)
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2020-08-27 14:32:54 -07:00
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2020-08-28 08:48:19 -07:00
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2020-08-27 14:32:54 -07:00
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## Immobilizer
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NALDEC NC87 67 790 MAZDA MX5 EUNOS MK2 MK2.5 BURGLAR ALARM MODULE NC8767790 is not an immobilizer
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US immobilizer
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## Wiper Motor
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## Charging
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## Air Conditioning
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2020-08-28 06:02:28 -07:00
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See also [Mazda Miata 2002](Mazda-Miata-2002)
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2020-08-27 14:32:54 -07:00
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## Starting & power
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In start or run ECU is powered from Engine Fuse 15A (behind left side of dash) via 4S. (This is different from 2002 - nothing on 4S in 2002)
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ECU controls main relay via 3H. (This is different from 2002 - nothing on 3H in 2002)
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ECU gets +12v from main relay output 4AF which is used as +12v source for VVT (4D) and IAC (2P).
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Fly-back diode - stripe facing +12 - is needed between VVT 4D (power, stripe side) and VVT control 4R.
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Fly-back diode - stripe facing +12 - is needed between IAC 2P (power, stripe side) and IAC control 2Q.
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See http://rusefi.com/forum/viewtopic.php?f=3&t=906&p=25018l#p25018
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2020-08-28 06:02:28 -07:00
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For ignition key see [Mazda Miata 2002 - Starting & Power](Mazda-Miata-2002#starting--power)
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2020-08-27 14:32:54 -07:00
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## Misc
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Two timing marks - the left one is TDC
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