2004 SUBARU FORESTER engine

EN(H4DOTC 2.5)-45
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
15.Malfunction Indicator Light
A: PROCEDURE
B: ACTIVATION OF MALFUNCTION
INDICATOR LIGHT
1) When the ignition switch is turned to ON (engine
off), the malfunction indicator light in the combina-
tion meter illuminates.
NOTE:
If the malfunction indicator light does not illuminate,
perform the diagnosis of malfunction indicator light
circuit or the combination meter circuit. EN(H4DOTC 2.5)-47, MALFUNCTION INDICA-
TOR LIGHT DOES NOT COME ON, Malfunction
Indicator Light.>2) After starting the engine, the malfunction indica-
tor light goes out. If it does not, either the engine or
the emission control system is malfunctioning.
1. Activation of malfunction indicator light. Malfunction Indicator Light.>
↓
2. Check that the malfunction indicator light does not come on. LIGHT DOES NOT COME ON, Malfunction Indicator Light.>
↓
3. Check that the malfunction indicator light does not go off. DOES NOT GO OFF, Malfunction Indicator Light.>
↓
4. Malfunction indicator light does not blink at a cycle of 3 Hz. DOES NOT BLINK AT A CYCLE OF 3 HZ, Malfunction Indicator Light.>
↓
5. Malfunction indicator light remains blinking at a cycle of 3 Hz. LIGHT REMAINS BLINKING AT A CYCLE OF 3 HZ, Malfunction Indicator Light.>
(A) Malfunction indicator light
EN-00335(A)
(1) No faulty
(2) Trouble occurs
(3) ON
(4) OFF
(5) Ignition switch ON
(6) Engine start
EN-01679
(1)
(2)
(5)
(6)(3)
(4)
(3)
(4)

EN(H4DOTC 2.5)-46
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
3) If the diagnosis system detects a misfire which
could damage the catalyst, the malfunction indica-
tor light will blink at a cycle of 1 Hz.
4) When the ignition switch is turned to ON (engine
off) or to “START” with the test mode connector
connected, the malfunction indicator light blinks at
a cycle of 3 Hz.
(1) ON
(2) OFF
(3) Ignition switch ON
(4) Engine start
(5) Misfire start
(6) 1 second
(1) ON
(2) OFF
(3) Ignition switch ON
(4) 1 second
EN-01680
(2) (1)
(3)
(4)
(5)(6)
EN-01681
(2)(1)
(4)
(3)

EN(H4DOTC 2.5)-47
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
C: MALFUNCTION INDICATOR LIGHT DOES NOT COME ON
DIAGNOSIS:
The malfunction indicator light circuit is open or shorted.
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), malfunction indicator light does not operate.
WIRING DIAGRAM:
EN-02354
SBF-4 SBF-1
No.14B72
B38
B134ECMi3
E
1 4
17
i12 A:
i10 B:B9
A1
B72 i12 i10
i3
3412
123 456
789 121310 11 14
13
i3 B38
A: B: COMBINATION
METERIGNITION
SWITCHBATTERY
B134
56 7
82 1
94 3
10
24 22 23 25 11 12 13 14 15
26 27
2816 17
18 19 20 21
33 34 29
32 30 31
16
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
123456789101112131415161718192021222324252627282930

EN(H4DOTC 2.5)-48
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
Step Check Yes No
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B134) No. 17 (+) — Chassis ground (
−):Is the voltage less than 1 V? Go to step 4.Go to step 2.
2 CHECK POOR CONTACT.Does the malfunction indicator
light come on when shaking or
pulling the ECM connector and
harness?Repair the poor
contact in ECM
connector.Go to step 3.
3 CHECK ECM CONNECTOR.Is the ECM connector correctly
connected?Replace the ECM.
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>Repair the con-
nection of ECM
connector.
4 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the combination meter. IDI-10, Combination Meter Assembly.>
3) Disconnect the connector from ECM and
combination meter.
4) Measure the resistance of harness between
ECM and combination meter connector.
Connector & terminal
(B134) No. 17 — (i12) No. 1:Is the resistance less than 1
Ω?Go to step 5.Repair the harness
and connector.
NOTE:
In this case repair
the following:
 Open circuit in
harness between
ECM and combi-
nation meter con-
nector
 Poor contact in
coupling connector
5 CHECK POOR CONTACT.
Check poor contact in combination meter con-
nector.Is there poor contact in combi-
nation meter connector?Repair poor con-
tact in combination
meter connector.Go to step 6.
6 CHECK HARNESS BETWEEN COMBINA-
TION METER AND IGNITION SWITCH CON-
NECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i10) No. 9 (+) — Chassis ground (
−):Is the voltage more than 10 V? Replace the board
of combination
meter. 10, Combination
Meter Assembly.>Check the follow-
ing and repair if
necessary.
N
OTE:
 Blown out of
fuse (No. 14)
 Open or short
circuit in harness
between fuse (No.
14) and battery
terminal
 Poor contact in
ignition switch con-
nector

EN(H4DOTC 2.5)-49
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
D: MALFUNCTION INDICATOR LIGHT DOES NOT GO OFF
DIAGNOSIS:
The malfunction indicator light circuit is shorted.
TROUBLE SYMPTOM:
Although malfunction indicator light comes on when the engine runs, DTC is not shown on the Subaru Select
Monitor or OBD-II general scan tool display.
WIRING DIAGRAM:
Step Check Yes No
1 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Turn the ignition switch to ON.Does malfunction indicator
light illuminate?Repair short circuit
in harness
between combina-
tion meter and
ECM connector.Replace the ECM.
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
EN-02354
SBF-4 SBF-1
No.14B72
B38
B134ECMi3
E
1 4
17
i12 A:
i10 B:B9
A1
B72 i12 i10
i3
3412
123 456
789 121310 11 14
13
i3 B38
A: B: COMBINATION
METERIGNITION
SWITCHBATTERY
B134
56 7
82 1
94 3
10
24 22 23 25 11 12 13 14 15
26 27
2816 17
18 19 20 21
33 34 29
32 30 31
16
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
123456789101112131415161718192021222324252627282930

EN(H4DOTC 2.5)-50
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
E: MALFUNCTION INDICATOR LIGHT DOES NOT BLINK AT A CYCLE OF 3 Hz
DIAGNOSIS:
 The malfunction indicator light circuit is open or shorted.
 Test mode connector circuit is in open.
TROUBLE SYMPTOM:
When in inspection mode, malfunction indicator light does not blink at a cycle of 3 Hz.
WIRING DIAGRAM:
EN-02355
SBF-4 SBF-1
No.14B72
B38B75 B76B21
E2
B134
B137ECM i3
E
E
1 4
16 1 1
A17
D15
i12 A:
i10 B:B125 B126
A:
D: B9
A1
B72 B75 B76
i12B137 B21
3412
123 456
789 121310 11 14 123
4
56
78
91011 12
1314 15 16
1
2 1
2 1
21
2
B125
13
i3 B38
1 1
A: D:
B134 A:
56 7
82 1
94 310
24 22 23 25 11 12 13 14 15
26 27
2816 17
18 19 20 21
33 34 29
32 30 31
567
82 1
94 310
22 23 11 12 13 14 15
24 25
2616 17
18 19 20 21
27 28 29 30 31
16
IGNITION
SWITCHBATTERY
COMBINATION
METER

219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
i3i10 B:
123456789101112131415161718192021222324252627282930

EN(H4DOTC 2.5)-51
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
Step Check Yes No
1 CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the test mode connectors.
3) Turn the ignition switch to ON. (engine OFF)Does malfunction indicator
light illuminate?Go to step 2.Repair the malfunc-
tion indictor light cir-
cuit. EN(H4DOTC 2.5)-
47, MALFUNC-
TION INDICA-
TOR LIGHT
DOES NOT
COME ON, Mal-
function Indicator
Light.>
2 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Turn the ignition switch to ON.Does malfunction indicator
light illuminate?Repair ground
short circuit in har-
ness between com-
bination meter and
ECM connector.Go to step 3.
3 CHECK HARNESS BETWEEN TEST MODE
CONNECTOR AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness
between test mode connector and chassis
ground.
Connector & terminal
(B76) No. 1 — Chassis ground:Is the resistance less than 1
Ω?Go to step 4.Repair the harness
and connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
test mode connec-
tor and chassis
ground
4 CHECK POOR CONTACT.
Check poor contact in ECM connector.Is there poor contact in ECM
connector?Repair the poor
contact in ECM
connector.Go to step 5.
5 CHECK HARNESS BETWEEN ECM AND
TEST MODE CONNECTOR.
1) Connect the test mode connector.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B137) No. 15 — Chassis ground:Is the resistance less than 1
Ω?Go to step 6.Repair open circuit
in harness between
ECM and test
mode connector.
6 CHECK POOR CONTACT.
Check poor contact in ECM connector.Is there poor contact in ECM
connector?Repair the poor
contact in ECM
connector.Replace the ECM.
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>

EN(H4DOTC 2.5)-52
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
F: MALFUNCTION INDICATOR LIGHT REMAINS BLINKING AT A CYCLE OF 3
Hz
DIAGNOSIS:
Test mode connector circuit is shorted.
TROUBLE SYMPTOM:
Malfunction indicator light blinks at a cycle of 3 Hz when the ignition switch is turned to ON.
WIRING DIAGRAM:
EN-02355
SBF-4 SBF-1
No.14B72
B38B75 B76B21
E2
B134
B137ECM i3
E
E
1 4
16 1 1
A17
D15
i12 A:
i10 B:B125 B126
A:
D: B9
A1
B72 B75 B76
i12B137 B21
3412
123 456
789 121310 11 14 123
4
56
78
91011 12
1314 15 16
1
2 1
2 1
21
2
B125
13
i3 B38
1 1
A: D:
B134 A:
56 7
82 1
94 310
24 22 23 25 11 12 13 14 15
26 27
2816 17
18 19 20 21
33 34 29
32 30 31
567
82 1
94 310
22 23 11 12 13 14 15
24 25
2616 17
18 19 20 21
27 28 29 30 31
16
IGNITION
SWITCHBATTERY
COMBINATION
METER

219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
i3i10 B:
123456789101112131415161718192021222324252627282930