Subaru Legacy III (2000-2003 year). Manual - part 212

EN(H4SOw/oOBD)-38

ENGINE (DIAGNOSTICS)

ENGINE MALFUNCTION INDICATOR LAMP (MIL)

Step

Value

Yes

No

1

CHECK HARNESS BETWEEN ECM CON-
NECTOR AND ENGINE GROUNDING TER-
MINAL.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between 

ECM connector and engine ground.

Connector & terminal

(B135) No. 14 — Engine ground:

Is the measured value less than the speci-
fied value?

5 

Ω

Repair short circuit 
in harness 
between ECM and 
test mode connec-
tor.

Replace ECM.  
<Ref. to 
FU(H4SOw/
oOBD)-42, Engine 
Control Module.>

EN(H4SOw/oOBD)-39

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

12.Diagnostics for Engine Starting Failure

A: PROCEDURE

1.

Inspection of starter motor circuit. <Ref. to EN(H4SOw/oOBD)-40, STARTER MOTOR CIRCUIT, Diagnostics for Engine 

Starting Failure.>

↓

2.

Inspection of ECM power supply and ground line. <Ref. to EN(H4SOw/oOBD)-43, CONTROL MODULE POWER SUPPLY 

AND GROUND LINE, Diagnostics for Engine Starting Failure.>

↓

3.

Inspection of ignition control system. <Ref. to EN(H4SOw/oOBD)-46, IGNITION CONTROL SYSTEM, Diagnostics for Engine 

Starting Failure.>

↓

4.

Inspection of fuel pump circuit. <Ref. to EN(H4SOw/oOBD)-50, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Fail-

ure.>

↓

5.

Inspection of fuel injector circuit. <Ref. to EN(H4SOw/oOBD)-53, FUEL INJECTOR CIRCUIT, Diagnostics for Engine Starting 

Failure.>

EN(H4SOw/oOBD)-40

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

B: STARTER MOTOR CIRCUIT

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES. <Ref. 
to EN(H4SOw/oOBD)-28, OPERATION, Clear Memory Mode.>  and <Ref. to EN(H4SOw/oOBD)-26, OP-
ERATION, Inspection Mode.>
• WIRING DIAGRAM:

Step

Value

Yes

No

1

CHECK OPERATION OF STARTER MOTOR.
Does starter motor operate when the switch 
starts?

Starter motor operates.

Go to step 2.

Go to step 3.

EN-01045

12

INHIBITOR SWITCH

STARTER
MOTOR

7

P

R

N

D

3

2

1

SBF-4

SBF-1

B14

12

11

T7

T3

B12

AT

MT

MT

5 6 7

8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26

27 28

16 17 18 19

20 21

B135

T7

1 2 3 4 5 6
7 8 9 10 11 12

28

B135

ECM

BATTERY

3

1

B72

IGNITION 
SWITCH

AT

B72

3 4

1 2

B12

1 2 3 4
5 6 7 8
9 10 11 12

EN(H4SOw/oOBD)-41

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

2

CHECK DTC.
<Ref. to EN(H4SOw/oOBD)-24, OPERATION, 
Read Diagnostic Trouble Code (DTC).>
Is the trouble code stored in memory? <Ref. to 
EN(H4SOw/oOBD)-57, LIST, List of Diagnostic 
Trouble Code (DTC).>

Trouble code is stored in mem-
ory.

Record DTC. 
Repair the trouble 
cause. <Ref. to 
EN(H4SOw/
oOBD)-59, Diag-
nostic Procedure 
with Diagnostic 
Trouble Code 
(DTC).>

Go to step 3.

3

CHECK INPUT SIGNAL FOR STARTER MO-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from starter motor.
3) Turn ignition switch to ST.
4) Measure power supply voltage between 

starter motor connector terminal and 
engine ground.

Connector & terminal

(B14) No. 1 (+) — Engine ground (

−−−−

):

NOTE:

On AT vehicles, place the selector lever in the
“P” or “N” position.

Does the measured value exceed the spec-
ified value?

10 V

Go to step 4.

Go to step 5.

4

CHECK GROUND CIRCUIT OF STARTER 
MOTOR.
1) Turn ignition switch to OFF.
2) Disconnect terminal from starter motor.
3) Measure resistance of ground cable 

between ground cable terminal and engine 
ground.
Is the measured value less than the speci-
fied value?

5 

Ω

Check starter 
motor.  <Ref. to 
SC(H4SO)-6, 
Starter.>

Repair open circuit 
of ground cable.

5

CHECK HARNESS BETWEEN ECM AND 
STARTER MOTOR CIRCUIT.
1) Turn ignition switch to OFF.
2) Measure resistance between starter motor 

and ECM.

Connector & terminal

(B14) No. 1 — Engine ground:

Is the measured value less than the speci-
fied value?

1 

Ω

Repair ground 
short circuit.

Go to step 6.

6

CHECK HARNESS BETWEEN ECM AND 
STARTER MOTOR CIRCUIT.
1) Turn ignition switch to START.
2) Measure resistance of fuse.

Connector & terminal

(B14) No. 1 — Engine ground:

Is the measured value less than the speci-
fied value?

1 

Ω

Go to step 7.

Repair ground 
short circuit.

Step

Value

Yes

No