Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 212

EN(H4DOTC)(diag)-72

Malfunction Indicator Light

ENGINE (DIAGNOSTICS)

F: MALFUNCTION INDICATOR LIGHT REMAINS BLINKING

DIAGNOSIS:

The delivery (test) mode connector circuit is short-circuited to ground.

TROUBLE SYMPTOM:

Malfunction indicator light blinks when delivery (test) mode connector is not connected.

WIRING DIAGRAM:

• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,

Engine Electrical System.>

• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine

Electrical System.>

ECM

1

1

1

B76

B75

B364

B363

1
2

B364

B76

B75

1
2

B363

B122

3 4

5 6

1 2

7 8

2 3 4 5

1

6 7 8

i97

i10

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

21

*

**

22

i97

*

4

34

i10

2

B72

1

3

4 5 6

2

16

10 11 12 13 14 15

25

24

30

9

8

7

17 18 19 20
28

21 22 23

29

32

31

1

2

3

4

5

6

27

26

33 34 35

B136

B136

*

B122

1

B72

3

*

EN-09248

E

SBF-6

E

MAIN SBF

No. 5

IGNITION

SWITCH

BATTERY

DRIVE CIRCUIT

COMBINATION

METER

: TERMINAL No. OPTIONAL ARRANGEMENT

DELIVERY

(TEST)

MODE

CONNECTOR

TEST MODE

SUB

CONNECTOR

EN(H4DOTC)(diag)-73

Malfunction Indicator Light

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK DELIVERY (TEST) MODE CONNEC-
TOR.
1) Check the delivery (test) mode connector is
disconnected.
2) Turn the ignition switch to ON.

Does the malfunction indicator
light blink?

Go to step

2.

System is normal.
NOTE:

Malfunction indica-
tor light blinks at a
cycle of 3 Hz when
delivery

(test)

mode connector is
connected.

2

CHECK HARNESS BETWEEN ECM AND DE-
LIVERY (TEST) MODE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nector and chassis ground.

Connector & terminal

(B136) No. 34 — Chassis ground:

Is the resistance 1 MΩ or
more?

Replace the ECM.
<Ref. to FU(STI)-
59, Engine Control
Module (ECM).>
<Ref. to FU(w/o
STI)-57, Engine
Control Module
(ECM).>

Repair the short
circuit to ground in
harness between
ECM connector
and delivery (test)
mode connector.

EN(H4DOTC)(diag)-74

Diagnostics for Engine Starting Failure

ENGINE (DIAGNOSTICS)

17.Diagnostics for Engine Starting Failure

A: PROCEDURE

1. Check of the fuel amount

↓

2. Inspection of starter motor circuit <Ref. to EN(H4DOTC)(diag)-75, STARTER MOTOR CIRCUIT, Diagnostics for Engine Start-
ing Failure.>

↓

3. Inspection of ECM power supply and ground line <Ref. to EN(H4DOTC)(diag)-78, CHECK POWER SUPPLY AND GROUND
LINE OF ENGINE CONTROL MODULE (ECM), Diagnostics for Engine Starting Failure.>

↓

4. Inspection of ignition control system <Ref. to EN(H4DOTC)(diag)-80, IGNITION CONTROL SYSTEM, Diagnostics for Engine
Starting Failure.>

↓

5. Inspection of fuel pump circuit <Ref. to EN(H4DOTC)(diag)-82, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Fail-
ure.>

↓

6. Inspection of fuel injector circuit <Ref. to EN(H4DOTC)(diag)-83, FUEL INJECTOR CIRCUIT, Diagnostics for Engine Starting
Failure.>

EN(H4DOTC)(diag)-75

Diagnostics for Engine Starting Failure

ENGINE (DIAGNOSTICS)

B: STARTER MOTOR CIRCUIT

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,

OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-

DURE, Inspection Mode.>.

WIRING DIAGRAM:

• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,

Engine Electrical System.>

• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine

Electrical System.>

Step

Check

Yes

No

1

CHECK BATTERY.
Check the battery. <Ref. to SC(STI)-27, Bat-
tery.>

Is the battery OK?

Go to step

2.

Charge or replace
the battery. <Ref.
to SC(STI)-27,
Battery.>

2

CHECK OPERATION OF STARTER MOTOR. Does the starter motor oper-

ate?

Go to step

3.

Go to step

4.

ECM

13
14

15 16

17

27

24

25
26

20

21
22

23

29
30

31

28

32 35

33
34

37
38

39

36

40

8

9

10

11 12

1

2

5

3

4

7

6

19

18

B225

1
2

B106

B106

1

2

5

6

7

2

1

3

4

29

10 11 12 13 14 15

25

24

16

30

9

8

17 18 19

20
28

21 22 23

32

31

26 27

33

34 35

EN-09249

16

10 11 12 13 14 15

25

24

30

9

8

7

17 18 19 20
28

21 22 23

29

32

31

1

2

3

4

5

6

27

26

33 34 35

B72

1

3

4 5 6

2

6

2

3

B14

B72

C: B136

C: B136

B: B135

B: B135

0

1

2

1

9

1

1

B225

C16

B26

SBF-6

E

M

F/B No. 21

MAIN SBF

BATTERY

IGNITION

SWITCH

STARTER

RELAY

STARTER MOTOR

CLUTCH

START

SWITCH