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