Trouble Codes

To read trouble codes, observe oxygen sensor monitor light. This light has two duration periods of illumination, one period long (1.2 seconds) and one period short (.3 seconds). The long period signifies the tens digit in a numbered code. Short period signifies the ones digit. So for example: 3 long flashes and 5 short flashes, that would signify a code 35.

It is possible to have more than one code present. In this case, the lowest number trouble code should be diagnosed first, the next highest numbered code second and so on. Trouble codes will be repeated as long as the system is in that particular diagnostic mode.

Fig 1: SPFI System Component Layout

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: General Trouble Shooting Chart

Courtesy of SUBARU OF AMERICA, INC.

NOTE: When using diagnostic charts, check the connector while it is connected unless specified otherwise. Be sure to check again from the beginning in order to prevent secondary trouble caused by repair work. When checking with vacuum hose disconnected from vacuum switch at Engine (E/G) on, be sure to plug hose.

Fig 3: Control Unit Connector Diagrams

Courtesy of SUBARU OF AMERICA, INC.

FUEL INJECTION SYSTEM CONTROL UNIT CONNECTOR

Terminal	Wire Color	Description
1	LG	Kickdown control
2	RL	CHECK ENGINE light
3	R	Test 4
4	LR	EGR solenoid (control)
5	GL	Purge control solenoid
6	LY	Air conditioner signal
7	.	.
8	W	Air flow meter (signal)
9	B	Air flow meter (GND)
10	Y	Line end cord output
11	L	Line end cord output
12	RL	Line end cord output
13	YR	Inhibitor switch (AT models only)
14	YG	Neutral switch
15	YL	Parking switch (AT models only)
16	LgR	Kickdown monitor
17	R	Air flow meter power (output)
18	LgY	Starter switch
19	GB	Crank angle sensor power (output)
20	GY	Crank angle sensor signal (reference)
21	BW	Crank angle sensor signal (position)
22	YG	Car speed sensor
23	WB	Water temperature sensor
24	LG	Idle switch
25	W	Throttle sensor (signal}
26	R	Throttle sensor power (output)
27	BW	Power (input)
28	GW	Self-shutoff signal
29	W	Power (input)
30	BR	GND
31	Br	Test mode connector (used at line end only)
32	BR	Test mode connector (used at line end only)
33	Lg	49-state/Cal identification
34	SA	O2 sensor
35	B	GND
36	WR	EGR monitor
37	LgR	Test mode connector (used at line end only)
38	RL	Ignition switch
39	LgW	Clear memory
40	.	.
41	W	Power (input)
42	BR	GND
43	RW	Injector (+)
44	BR	GND
45	GR	Air control valve
46	GY	A/C control
47	LB	Fuel pump
48	RB	Injector (-)
49	RL	Power (input)
50	BY	GND
51	B	GND
52	WY	Ignition control

CONTROL UNIT CONNECTOR TERMINAL & RELATED TROUBLE CODE

Term No.	Lead Color	Trouble Code	Symptom Resulting From Poor Terminal Contact
1	YR	N/A	Shock is not felt.
2	SA	23	Engine stalls during idle. It can be restarted. Problems do not occur while driving.
3	GL	35	Shock is not felt.
4	YL	N/A	Shock is not felt.
5	B	N/A	Engine runs at low speed and sometimes stalls during idle. It can be started but idle speed is low.
6	LB	N/A	Engine stalls during idle. It cannot be restarted if affected circuit remains opened. Engine lacks power while driving.
7	R	11	Engine stalls during idle. Shock is felt. Engine lacks power (poor acceleration) while driving.
8	W	11	Engine stalls during idle. Shock is felt. Engine speed decreases while driving.
9	WB	21	Slight shock is felt while engine is cold but is not felt after warm-up. Driving performance is affected while engine is cold but is not affected after warmup.
10	BR	N/A	Shock is not felt.
12	SA	23	Engine stalls during idle. It can be restarted. Problems do not occur while driving.
13	RB	N/A	No change occurs.
14	YW	N/A	No change occurs
15	GY	N/A	No change occurs
16	BR	N/A	No change occurs.
17	W	13	Engine stalls during idle. Shock is felt. Engine lacks power (poor acceleration) while driving.
19	BW	N/A	Engine stalls during idle. It cannot be restarted. Shock is felt if poor intermittent contact occurs while driving.
20	BR	N/A	No change occurs.
21	W	31	Shock is not felt. Engine acceleration is poor.
22	B	31	Shock is not felt. Engine acceleration is poor.
23	LY	N/A	No change occurs.
24	BW	12	ECS lamp comes on when starting engine and soon goes off. There is no problem.
25	LW	N/A	No change occurs.
27	WR	N/A	No change occurs.
28	BY	N/A	No change occurs.
29	YG	33	No change occurs.
30	BR	N/A	No change occurs.
32	Br	N/A	No change occurs.
33	LgW	N/A	No change occurs.
36	SA	22	Change rarely occurs. Engine sometimes knocks.
37	WY	N/A	No change occurs.
38	LgR	N/A	No change occurs.
39	GW	N/A	No change occurs.
40	RY	N/A	No change occurs.
41	LY	N/A	No change occurs.
42	BrB	N/A	No change occurs.
47	R	N/A	No change occurs.
48	SA	N/A	No change occurs.
49	W	14	Engine stalls during idle. It cannot be restarted if there is poor contact of affected connection. Shock is felt if poor intermittent contact occurs while driving.
50	W	14	Engine stalls during idle. It cannot be restarted if there is poor contact of affected connection. Shock is felt if poor intermittent contact occurs while driving.
51	WR	15	Engine stalls during idle. It cannot be restarted if there is poor contact of affected connection Shock is felt if poor intermittent contact occurs while driving.
52	WR	15	Engine stalls during idle. It cannot be restarted if there is poor contact of affected connection. Shock is felt if poor intermittent contact occurs while driving.
55	SA	N/A	Engine stalls during idle. It cannot be restarted if there is poor contact of affected connection. Shock is felt if poor intermittent contact occurs while driving.
56	B	N/A	No change occurs
57	B	N/A	No change occurs
59	L	N/A	No change occurs
60	BR	N/A	No change occurs
61	BR	N/A	No change occurs
62	R	N/A	No change occurs