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

 

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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?

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.

 

 

 

 

 

 

 

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