Name: ECU adapter
Creator: mikedoubleg
License: https://creativecommons.org/licenses/by-sa/4.0/

Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.

Components

Ref	Kind	Exclude from BOM
ME221-C1	connector	included
OEM-A	connector	included
OEM-B	connector	included
OEM-C	connector	included
OEM-D	connector	included
RLY1-R	connector	included
SP-0V	splice	included
SP-14V	splice	included
SP-GND	splice	included

Create part

KindManufacturerPart numberDescriptionUnit price

Cut list

Lengths need a layout (0 of 56 routed).

Wire	From / To	Gauge	Signal
W1	OEM-B-1 / SP-14V-1	0.85	Power source 1 (main relay)
W2	OEM-B-9 / SP-14V-1	0.85	Power source 2 (main relay)
W3	SP-14V-1 / ME221-C1-15	0.85	IGN +12V
W4	SP-14V-1 / ME221-C1-64	0.85	VBAT
W5	OEM-B-10 / SP-GND-1	0.85	Power ground 2
W6	OEM-B-2 / SP-GND-1	0.85	Power ground 1
W7	OEM-B-20 / SP-GND-1	0.85	Ground
W8	OEM-B-22 / SP-GND-1	0.85	Ground
W9	SP-GND-1 / ME221-C1-10	0.85	GROUND CHASSIS
W10	SP-GND-1 / ME221-C1-61	0.85	GROUND
W11	SP-GND-1 / ME221-C1-89	0.85	GROUND
W12	SP-GND-1 / ME221-C1-90	0.85	GROUND
W13	OEM-C-18 / SP-0V-1	0.5	Sensor ground 2
W14	OEM-C-30 / SP-0V-1	0.5	Cam (TDC2) sensor −
W15	OEM-C-31 / SP-0V-1	0.5	Timing ground
W16	OEM-C-7 / SP-0V-1	0.5	Sensor ground 1
W17	SP-0V-1 / ME221-C1-52	0.5	SENSORS GROUND
W18	SP-0V-1 / ME221-C1-84	0.5	Sensor Ground
W19	OEM-C-19 / ME221-C1-45	0.5	Sensor 5V supply 1 (MAP)
W20	OEM-C-28 / ME221-C1-46	0.5	Sensor 5V supply 2
W21	OEM-C-8 / ME221-C1-81	0.5	Crank sensor + (CKP+)
W22	OEM-C-9 / SP-0V-1	0.5	Crank sensor − (CKP−)
W23	OEM-C-20 / ME221-C1-22	0.5	Cam (TDC1) sensor +
W24	OEM-C-21 / SP-0V-1	0.5	Cam (TDC1) sensor −
W25	OEM-C-29 / ME221-C1-23	0.5	Cam (TDC2) sensor +
W26	OEM-C-4 / ME221-C1-32	0.5	Ignition coil 1
W27	OEM-C-12 / ME221-C1-31	0.5	Ignition coil 2
W28	OEM-C-13 / ME221-C1-2	0.5	Ignition coil 3
W29	OEM-C-14 / ME221-C1-1	0.5	Ignition coil 4
W30	OEM-B-11 / ME221-C1-63	0.5	Injector 1
W31	OEM-B-3 / ME221-C1-4	0.5	Injector 2
W32	OEM-B-4 / ME221-C1-33	0.5	Injector 3
W33	OEM-B-5 / ME221-C1-3	0.5	Injector 4
W34	OEM-A-15 / ME221-C1-73	0.5	Fuel pump relay (USDM)
W35	OEM-A-16 / ME221-C1-12	0.5	Fuel pump relay (JDM)
W36	OEM-A-17 / ME221-C1-74	0.5	A/C clutch relay
W37	OEM-A-20 / ME221-C1-44	0.5	Radiator fan relay
W38	OEM-A-28 / ME221-C1-69	0.5	Air pump relay
W39	OEM-B-12 / RLY1-R-OUT	0.5	VTEC solenoid
W40	SP-14V-1 / RLY1-R-IN	0.5	Relay contact input (switched +12 V)
W41	SP-14V-1 / RLY1-R-COIL+	0.5	Relay coil positive (switched +12 V)
W42	RLY1-R-COIL- / ME221-C1-39	0.5	Relay coil negative (ECU low-side driver)
W43	OEM-C-1 / ME221-C1-16	0.5	Primary O2 heater
W44	OEM-C-11 / ME221-C1-67	0.5	Secondary O2 heater control
W45	OEM-A-1 / ME221-C1-68	0.5	Coolant temp gauge drive
W46	OEM-A-12 / ME221-C1-70	0.5	Immobilizer indicator light
W47	OEM-A-18 / ME221-C1-71	0.5	Check engine light (MIL)
W48	OEM-A-19 / ME221-C1-79	0.5	Tacho output
W49	OEM-C-17 / ME221-C1-26	0.5	MAP sensor
W50	OEM-C-27 / ME221-C1-56	0.5	Throttle position sensor
W51	OEM-A-23 / ME221-C1-17	0.5	Secondary O2 sensor
W52	OEM-C-15 / ME221-C1-18	0.5	Secondary O2 sensor
W53	OEM-C-26 / ME221-C1-86	0.5	Coolant temp sensor
W54	OEM-C-25 / ME221-C1-57	0.5	Intake air temp sensor
W55	OEM-A-9 / ME221-C1-6	0.5	Vehicle speed sensor
W56	OEM-C-5 / ME221-C1-7	0.5	Alternator FR signal

Bill of materials

No wire parts assigned: 56 wires need a wire part.

Part number	Manufacturer	Description	Qty	Unit	Buy
connector4 lines
179679-6	TE	S2000 2000–05 ECU harness plug B (25P, TE 040 Multi-Lock)	1	ea	TE Connectivity
179680-5	TE	S2000 2000–05 ECU harness plug C (31P, TE 040 Multi-Lock)	1	ea	TE Connectivity
179681-6	TE	S2000 2000–05 ECU harness plug A (32P, TE 040 Multi-Lock)	1	ea	TE Connectivity
S2K-0005-ECU-D	Honda	S2000 2000–05 ECU plug D (P/N unknown)	1	ea	—