Subaru Legacy III (2000-2003 year). Manual - part 470

EN(H4DOSTC)-50

ENGINE (DIAGNOSTICS)

ENGINE MALFUNCTION INDICATOR LAMP (MI)

MEMO:

EN(H4DOSTC)-51

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

15.Diagnostics for Engine Starting Failure

A: PROCEDURE

1.

Inspection of starter motor circuit. <Ref. to EN(H4DOSTC)-52, STARTER MOTOR CIRCUIT, Diagnostics for Engine Starting 

Failure.>

↓

2.

Inspection of ECM power supply and ground line. <Ref. to EN(H4DOSTC)-56, CONTROL MODULE POWER SUPPLY AND 

GROUND LINE, Diagnostics for Engine Starting Failure.>

↓

3.

Inspection of fuel pump circuit. <Ref. to EN(H4DOSTC)-60, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Failure.>

EN(H4DOSTC)-52

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

B: STARTER MOTOR CIRCUIT

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(H4DOSTC)-
35, Clear Memory Mode.> and INSPECTION MODE <Ref. to EN(H4DOSTC)-33, Inspection Mode.> .
• WIRING DIAGRAM:

EN-00930

BATTERY

IGNITION

SWITCH

STARTER
MOTOR

SBF-4

SBF-1

B72

B72

B14

B134 ECM

E

E

1

3

16

3 4

1 2

B134

B12

T7

1 2 3 4

10 11 12

19 20 21

13

5

6

14 15

7

8 9

16 17

18

22

12

INHIBITOR SWITCH

7

P

R

N

D

3

2

1

12

11

T7

T3

B12

AT

AT

MT

MT

1 2 3 4 5 6
7 8 9 10 11 12

1 2 3 4
5 6 7 8
9 10 11 12

EN(H4DOSTC)-53

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

Step

Value

Yes

No

1

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

Operates.

Go to step 2.

Go to step 3.

2

CHECK DTC.
Is DTC displayed? 

DTC is indicated.

Check DTC using 
“List of Diagnostic 
Trouble Code 
(DTC)”. <Ref. to 
EN(H4DOSTC)-
62, List of Diag-
nostic Trouble 
Code (DTC).>

Repair poor con-
tact in ECM con-
nector.

3

CHECK INPUT SIGNAL FOR STARTER MO-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from starter 

motor.

3) Turn the ignition switch to ST.
4) Measure the power supply voltage between 

starter motor connector terminal and 
engine ground.

Connector & terminal

(B14) No. 1 (+) — Engine ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

NOTE:

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

10 V

Go to step 4.

Go to step 5.

4

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

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

5 

Ω

Check the starter 
motor.  <Ref. to 
SC(H4DOSTC)-6, 
Starter.>

Repair the open 
circuit of ground 
cable.

5

CHECK HARNESS BETWEEN BATTERY 
AND IGNITION SWITCH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ignition 

switch.

3) Measure the power supply voltage between 

ignition switch connector and chassis 
ground.

Connector & terminal

(B72) No. 1 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 6.

Repair the open 
circuit in harness 
between ignition 
switch and battery, 
and check fuse 
SBF No. 4 and 
SBF No. 1.

6

CHECK IGNITION SWITCH.
1) Disconnect the connector from ignition 

switch.

2) Measure the resistance between ignition 

switch terminals while turning ignition 
switch to the “ST” position.

Terminals

No. 1 — No. 3:

Is the measured value less than specified 
value?

5 

Ω

Go to step 7.

Replace the igni-
tion switch.