ECU Terminal Diagram

USA AE86 16V 4A-GE

Submitted By Richard White

4A-GE Electronic Control Unit (ECU), 8408~8708 Corolla GTS US Market, Toyota P/N 89661-12092-84

 

 

 

Per Electrical Manual (E21 and E2 incorrect in the Factory USA electrical manual)

 

Correct pin diagram as informed by Woody (tested)

 

 

 

Factory Repair Manual, pins listed correctly. V Connector

Pin No.	Symbol	Color	Terminal
1
2	VF	R-L	Check connector
3	ST (STA)	B-W	Starter switch
4	No. 10	Y	No. 3, 4 injector
5	E01	BR	Engine ground (Power)
6	VSV-(S/TH)	R-W	Vacuum switching valve (S/TH)
7	E1	BR	Engine ground
8	IGT	B	Igniter
9	No. 20	G	No. 1, 2 injector
10	E02	BR	Engine ground (Power)

  U Connector

Pin No.	Symbol	Color	Terminal
1	NE	R	Engine revolution sensor
2
3	G+	B	Engine revolution sensor
4	G-	W	Engine revolution sensor
5	IGF	B-Y	Igniter
6	IDL	L	Throttle sensor
7	T	LG-B	Check connector
8	WAN	G-W	Warning light
9
10	THW	G	Water temp. sensor
11	VTA	R	Throttle sensor
12	VCC	L-R	Throttle sensor
13	OX	B	Oxygen sensor
14	E21	BR	Sensor Earth
15	A/C	B-W	A/C Magnet clutch
16
17
18	I/UP (VISC)	B	Vacuum switching valve [Idle up]

T Connector

Pin No.	Symbol	Color	Terminal
1	+B1	B-R	Main relay
2	BaTT	R-W	Battery
3	THA	Y	Inlet air temp. sensor
4	VS	Y-L	Air flow meter
5	VC	L-R	Air flow meter
6
7
8	+B	B-R	Main relay
9
10	SPD	L-W	Speedometer
11
12	E2	B-R	Sensor earth
13
14

  Source: 1985 Toyota Corolla FR Repair Manual