Subaru Legacy III (2000-2003 year). Manual — part 317

EN(H6DO)-70

ENGINE (DIAGNOSTICS)

ENGINE MALFUNCTION INDICATOR LAMP (MI)

MEMO:

EN(H6DO)-71

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

17.Diagnostics for Engine Starting Failure

A: PROCEDURE

1.

Inspection of starter motor circuit. <Ref. to EN(H6DO)-72, STARTER MOTOR CIRCUIT, Diagnostics for Engine Starting Fail-

ure.>

↓

2.

Inspection of ECM power supply and ground line. <Ref. to EN(H6DO)-76, CONTROL MODULE POWER SUPPLY AND

GROUND LINE, Diagnostics for Engine Starting Failure.>

↓

3.

Inspection of ignition control system. <Ref. to EN(H6DO)-80, IGNITION CONTROL SYSTEM, Diagnostics for Engine Starting

Failure.>

↓

4.

Inspection of fuel pump circuit. <Ref. to EN(H6DO)-84, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Failure.>

↓

5.

Inspection of fuel injector circuit. <Ref. to EN(H6DO)-86, FUEL INJECTOR CIRCUIT, Diagnostics for Engine Starting Fail-

ure.>

↓

6.

Inspection using Subaru Select Monitor or OBD-II general scan tool <Ref. to EN(H6DO)-96, Diagnostic Procedure with Diag-

nostic Trouble Code (DTC).> or inspection using “General Diagnostics Table”. <Ref. to EN(H6DO)-332, General Diagnostic
Table.>

EN(H6DO)-72

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(H6DO)-54,
OPERATION, Clear Memory Mode.> and INSPECTION MODE <Ref. to EN(H6DO)-47, OPERATION, In-
spection Mode.>.
• WIRING DIAGRAM:

EN-01082

12

INHIBITOR SWITCH

STARTER

MOTOR

7

P

R

N

D

3

2

1

SBF-4

SBF-1

B14

12

11

T7

T3

B12

B134

T7

1 2 3 4 5 6
7 8 9 10 11 12

16

B134

ECM

BATTERY

1 2 3 4

10 11 12

19 20 21

13

5

6

14 15

7

8 9

16 17

18

22

1

3

B72

IGNITION
SWITCH

B12

1 2 3 4
5 6 7 8
9 10 11 12

B72

3 4

1 2

EN(H6DO)-73

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

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.

2

CHECK DTC.
Is diagnostic trouble code (DTC) displayed?
<Ref. to EN(H6DO)-46, OPERATION, Read
Diagnostic Trouble Code.>

Diagnostic trouble code (DTC)
is displayed.

Check the relevant
DTC using “List of
Diagnostic Trou-
ble Code (DTC)”.
<Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>

Repair poor con-
tact of ECM con-
nector.

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 (

−−−−

):

Does the measured value exceed the spec-
ified value?

NOTE:

Place the selector lever in the “P” or “N” posi-
tion.

10 V

Go to step 4.

Go to step 5.

4

CHECK GROUND CIRCUIT OF STARTER
MOTOR.
1) Turn ignition switch to OFF.
2) Measure resistance 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(H6DO)-6,
Starter.>

Repair open circuit
of ground cable.

5

CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Ignition switch to OFF.
2) Disconnect connector from ignition switch.
3) Measure 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.

Check the follow-
ing items and
repair, if neces-
sary.
• Blown out fuse
• Open circuit in
harness between
ignition switch and
battery

6

CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Connect connector to ignition switch.
2) Turn ignition switch to START.
3) Measure voltage between ignition switch

and chassis ground.

Connector & terminal

(B72) No. 3 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 7.

Replace ignition
switch.