Subaru Legacy III (2000-2003 year). Service 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-
↓
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
↓
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-
↓
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.
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
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
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
Replace ignition
switch.
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