1990/1991 Honda MPFI CRX ECU Wiring reference
	The colors are ordered with the "primary" color of the wire listed first and the "stripe" color is listed second
	Last Updated on 25-Sept-2000 by David Moore  *  http://www.dmoore.com
	C451	(Shown from WIRE side of FEMALE connections)
		Numbers inside corrospond to those in the Hnda Electrical Service Manual
		Letters/Numbers on the outside corrospond to the Chilton/Standard Service Manual
		Bold number connectors are heavy gauge wire
	Brown	Red	Lt Blue	Yellow	Key	Blu/Yel	Yel/Blk	Yel/Blk	Not Used
	A1	A3	A5	A7	(A9)	A11	A13	A15	A17
	1	2	3	4		5	6	7	8
	9	10	11	12	13	14	15	16	17
	A2	A4	A6	A8	A10	A12	A14	A16	A18
	Black	Black	Green	Not Used	Not Used	Grn/Blk	Grn/Blk	Brn/Blk	Blk/Red
	Pinout Cross Reference and Function
	A1 / 1 - Injector #1
	A3 / 2 - Injector #2
	A5 / 3 - Injector #3
	A7 / 4 - Injector #4
	A11 / 5 - EACV (Electronic Air Control Vavle) - Si Only
	A13 & A15 / 6 & 7 - Power Input to Fuel Injector Box (connected later in the harness)
	A2 & A4 / 9 & 10 - Ground (to main relay - connected later in the harness)
	A6 / 11 - Purge Cut-Off Solenoid Vavle (Si Only)
	A12 & A14 / 14 & 15 - Fuel Pump Control (Main Relay)
	A16 & A18 / 16 & 17 - Ground (for shields on CYL/TDC/Crank Wiring)
	C452	(Shown from WIRE side of FEMALE connections)
		Numbers inside corrospond to those in the Hnda Electrical Service Manual
		Letters/Numbers on the outside corrospond to the Chilton/Standard Service Manual
		Bold number connectors are heavy gauge wire
	Wht/Grn	Yellow	Wht/Yel	(HF only) Grn	(HF only) Grn/Blk	(HF only) Green	Blu/Wht	White	White	Grn/Red
	B1	B3	B5	B7	B9	B11	B13	B15	B17	B19
	1	2	3	4	5	6	7	8	9	10
	11	12	13	14	15	16	17	18	19	20
	B2	B4	B6	B8	B10	B12	B14	B16	B18	B20
	Blue	Yel/Grn	Grn/Orn	Blu/Red	Orange	White	Blue	Yel/Red	Not Used	Brown
	Pinout Cross Reference and Function
	B1 / 1 - Battery (+12) Input (hot at all times - fuse #34 under hood)
	B3 / 2 - A/C compressor Clutch Relay Control
	B5 / 3 - Alternator RF Signal
	B7 / 4 - A/C on Input (HF Only - wire not present on Si)
	B9 / 5 - Back up Lights Switch (HF Only - wire not present on Si)
	B11 / 6 - Clutch Input Switch - reports when clutch petal pressed (HF Only - wire not present on Si)
	B13 / 7 - Starting input (hot when starting - also goes to main realy)
	B15 & B17 / 8 & 9 - Ignition output signal (to ignitor unit in distributor) connected later in the harness)
	B19 / 10 - Electric Load Detector (ELD) input
	B2 / 11 - Fast Idle Control Solienoid Vavle Control (Si Only - not present on 88 Si)
	B4 / 12 - A/C on input
	B6 / 13 - Check Engine Warning Light Control
	B8 / 14 - Radiator fan and Condensor Fan Control
	B10 & B12 / 15 & 16 - Crank Sensor (in Distributor)
	B14 / 17 - Alternator Output Signal
	B16 / 18 - From Speed pulser in Dash Cluster (speed sensor)
	B18 / 19 - Not Used in Si/HF
	B20 / 20 - Ignition Timing Adjustment Connector Input (jumper for setting timing)
	C453	(Shown from WIRE side of FEMALE connections)
		Numbers inside corrospond to those in the Hnda Electrical Service Manual
		Letters/Numbers on the outside corrospond to the Chilton/Standard Service Manual
		Bold number connectors are heavy gauge wire
	Blu/Grn	Org/Blu	Red/Yel	Red/Blue	Red/Wht	Grn/Wht	Yel/Wht	Yel/Red
	C1	C3	C5	C7	C9	C11	C13	C15
	1	2	3	4	5	6	7	8
	9	10	11	12	13	14	15	16
	C2	C4	C6	C8	C10	C12	C14	C16
	Blu/Yel	Wht/Blu	Red/Wht	Yellow (HF Only)	Grn/Wht	Grn/Wht	Grn/Wht	White
	C1 / 1 - CYL Sensor (in Distributor)
	C3 / 2 - TDC Sensor (in Distributor)
	C5 / 3 - Intake Air Temperature sensor (TA)
	C7 / 4 - Throttle Angle Sensor (TPS)
	C9 / 5 - Atmopsohere Pressure Sensor (PA)
	C11 / 6 - Manifold Absolute Pressure sensor (MAP) Ground Side
	C13 / 7 - 5+ volt reference for EGR (HF Only) and TPS sensors
	C15 / 8 - 5+ volt reference for MAP sensor
	C2 / 9 - CYL Sensor (in Distributor)
	C4 / 10 - TDC Sensor (in Distributor)
	C6 / 11 - Coolant Temperature Sensor (TW)
	C8 / 12 - EGR Vavle Lift Sensor Input (HF Only - wire not present on Si)
	C10 / 13 - Brake Light Switch Input
	C12 / 14 - Ground for Sensors (PA, TPS, etc)
	C14 / 15 - Manifold Absolute Pressure (MAP) sensor input (NOTE - the Electrical manaul has this listed wrong)
	C16 / 16 - Oxygen Sensor Input