1995 Honda Accord

ECU pinout

37820-P0A-A51


A1	W63	BRowN	Injector #1	Output
A2	W64	YEL	Injector #4	Output
A3	W61	RED	Injector #2	Output
A4	W62	GRN/YEL	VTEC Solenoid Valve	Output
A5	W59	BLUe	Injector #3	Output
A6	W60	ORG/BLK	O2 Heater	Output, sink/low
A7	W57	GRN/BLK	Fuel Pump Relay	Output, sink/low
A8	W58	*	*	*
A9	W55	BLK/BLU	Idle Air Control Valve	Output, sink/low. 500Hz
A10	W56	GRN/WHT	Engine Mount Control	Output
A11	W53	RED	EGR SOL	Output
A12	W54	GReeN	Radiator Fan Control Module	Output
A13	W51	LTGRN/RED	MIL	Output, low-side
A14	W52	WHT/YEL	Fuel Injection Air Control
A15	W49	RED/BLU	A/C compressor clutch relay	Output
A16	W50	WHT/GRN	Alternator Control
A17	W47	*	*	*
A18	W48	BRN/WHT	FAS (TCM)
A19	W45	ORG/GRN	Intake Air Resonator Control Solenoid valve	Output
A20	W46	RED/YEL	PCS
A21	W43	YEL/GRN	Ignition Control Module	Output, ~12v
A22	W44	*	*	*
A23	W41	BLK	Power Ground	Ground
A24	W42	BLK	Power Ground	Ground
A25	W39	YEL/BLK	Power Source	Input, +12 if ignition is on
A26	W40	BRN/BLK	Logic Ground	Ground


B1	W37	YEL/BLK	Power Source	Input, constant +12V
B2	W38	BRN/BLK	Logic Ground	Ground
B3	W35	WHT/RED	AFS A (TCM) Up/Down shift signal
B4	W36	GRN	AFS B (TCM) Up/Down shift signal
B5	W33	RED/WHT	AC Pres Switch
B6	W34	*	*	*
B7	W31	lightLTGRN	AT Gear Pos Part/Neutral	Input
B8	W32	GRN	Power Steering Pres Sw	Input, indicates high power steering load
B9	W29	BLU RED (or BLK/GRN)	STS
B10	W30	ORG	Vehicle Speed Sensor	Input (grounded 4 times per speedometer cable revolution)
B11	W27	ORanGe	CYP Signal	Input, one pulse per cam rev
B12	W28	WHT	CYP Ground
B13	CAM-	ORG BLU	TDC Signal	Input, four pulses per cam revolution
B14	CAM+	WHT BLU	TDC Ground
B15	CNK-	BLU GRN	CKP Signal	Input, 24 pulses per cam
B16	CNK+	BLU YEL	CKP Ground


D1	W21	WHT YEL	Voltage Back Up	Input, constant +12V
D2	W22		Brake Switch	Input
D3	W19	*	*	*
D4	W20	RED	Service Check Signal	Input, ground to activate
D5	W17	BLU/WHT	Baro OUT
D6	W18	BLU/BLK	VTEC Pressure Switch	Input
D7	W15	lightLTGRN RED	TXD/RXD data link
D8	W16	*	*	*
D9	W13	WHT RED	ALT FR Signal
D10	W14	GRN RED	Electrical Load Detector	Input (signals headlight, radio etc)
D11	W11	RED/BLK	Throttle Position Sensor	Input
D12	W12	WHT/BLK	EGR Lift Sensor	Input
D13	W9	RED/WHT	Engine Coolant Temperature Sensor	Input
D14	W10	WHT RED	Primary O2 Sensor	Input
D15	W7	RED YEL	Intake Air Temperature Sensor	Input (bias pull-up 1.5K)
D16	W8	*	*	*
D17	W5	WHiTe/YELlow	MAP Sensor	Input: 0.32V @ -13.9 PSI, 4.84V @ 10.94 PSI
D18	W6	lightLTGRN/BLK	VREF	Output for TCM +5V
D19	W3	YEL/WHT	VCC1 MAP sensor power supply	Output +5V
D20	W4	YEL BLU	VCC2 TPS, EGVL sensor power supply	Output +5V
D21	W1	GRN/WHT	SG1 MAP sensor GND	Ground
D22	W2	GRN BLU	SG2 - Sensors Ground	ground

Fuel Injector 06164-P0A-A00 248cc/min Low impedance

MAP sensor 37830-P05-A01

ECT sensor 37870-PJ7-003

IAT 37880-P0A-A02

DISTRIBUTOR ASSY D4T92-04

ignition control module 30120-P0A-A01

tcm 28100-P0H-A02


D1	*	*	*
D2	*	Brake switch	Input
D3		Baro Pressure	Input
D4	*	*	*
D5		Engine Coolant Temp sensor	Input
D6		Service Check Conn
D7		Throttle Position Sensor	Input
D8	*	*	*
D9	ORG	Vehicle Speed Sensor	Input
D10	*	*	*
D11	GRN	Up/Down shift sig
D12		Mainshaft speed Sensor Ground	Ground
D13	WHT/RED	Up/Down shift sig
D14	*	*	*
D15		Countershaft speed	Input
D16	BRN/WHiTe	Shift Ack
D17		Countershaft speed Sensor Ground	Ground
D18	LT GRN/BLK	Voltage Reference	Input +5
D19		Mainshaft speed	Input
D20	*	*	*
D21	*	*	*
D22	*	*	*

Measured 845 ohms between pins B15 / B16 also same for B14 / B13 and same for B12 / 11.

IC1: main chip, OKI 66911, DIP

Inputs: TDC input: HIC1#10, TTL signal: HIC1##8, goes to IC7#35

CYP input: HIC1#15, TTL signal: HIC1##12, goes to IC1#27

CKP input: HIC1#19, TTL signal: HIC1##17, goes to IC1#34

Outputs: Ignition module: IC7#28 via R28 & Q22