2004 SUBARU FORESTER Service Repair Manual

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Page 1689 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-59
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
17.Diagnostics for Engine Starting Failure
A: PROCEDURE
1. Inspection of starter motor circuit. <Ref. to EN(H4DOTC)-60, STARTE

Page 1690 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-60
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
B: STARTER MOTOR CIRCUIT
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-4

Page 1691 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-61
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
Step Check Yes No
1 CHECK OPERATION OF STARTER MOTOR.Does the starter motor oper-
ate?Go to step 2.Go to step 3.
2 CHECK DTC.I

EN(H4DOTC)-61
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
Step Check Yes No
1 CHECK OPERATION OF STARTER MOTOR.Does the starter motor oper-
ate?Go to step 2.Go to step 3.
2 CHECK DTC.Is DTC displayed? EN(H4DOTC)-39, OPERA-
TION, Read Diagnostic Trouble
Code (DTC).>Inspect the rele-
vant DTC using
List of Diagnostic
Trouble Code
(DTC). EN(H4DOTC)-74,
List of Diagnostic
Trouble Code
(DTC).>Go to step 3.
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 START.
4) Measure the power supply voltage between
starter motor connector terminal and engine
ground.
Connector & terminal
(B14) No. 1 (+) — Engine ground (
−):Is the voltage more than 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) Measure the resistance of ground cable
between ground cable terminal and engine
ground.Is the resistance less than 5
Ω?Check the starter
motor. SC(H4SO)-6,
Starter.>Repair 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 (
−):Is the voltage more than 10 V? Go to step 6.Check the follow-
ing and repair if
necessary.
Brown out
fuse
Open circuit
in harness
between igni-
tion switch and
battery.
6 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Connect the connector to ignition switch.
2) Turn the ignition switch to START.
3) Measure the voltage between ignition
switch and chassis ground.
Connector & terminal
(B72) No. 3 (+) — Chassis ground (
−):Is the voltage more than 10 V? Repair open circuit
between ignition
switch and starter
motor circuit.Go to step 7.
7 CHECK POOR CONTACT.
Check poor contact in ignition switch connec-
tor.Is there poor contact in ignition
switch connector?Repair poor con-
tact in ignition
switch connector.Replace the igni-
tion switch.

Page 1692 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-62
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
C: CHECK POWER SUPPLY AND GROUND LINE OF ENGINE CONTROL MOD-
ULE (ECM)
CAUTION:
After repair or replacement of faulty parts, c

Page 1693 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-63
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
RHD model
B72B136
34
12
BATTERYIGNITION
SWITCH MAIN RELAY
SBF-4SBF-1
SBF-5
B72 DATA LINK CONNECTOR
D16 B4
B1
A6
A7
D7
B12

Page 1694 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-64
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
Step Check Yes No
1 CHECK MAIN RELAY.
1) Turn the ignition switch to OFF.
2) Remove the main relay.
3) Connect the battery to

EN(H4DOTC)-64
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
Step Check Yes No
1 CHECK MAIN RELAY.
1) Turn the ignition switch to OFF.
2) Remove the main relay.
3) Connect the battery to main relay terminals
No. 1 and No. 2.
4) Measure the resistance between main relay
terminals.
Te r m i n a l s
No. 3 — No. 5:
No. 4 — No. 6:Is the resistance less than 10
Ω?Go to step 2.Replace the main
relay.
2 CHECK GROUND CIRCUIT FOR ECM.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B134) No. 6 — Chassis ground:
(B134) No. 7 — Chassis ground:
(B134) No. 34 — Chassis ground:
(B135) No. 1 — Chassis ground:
(B135) No. 12 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 7 — Chassis ground:
(B134) No. 34 — Chassis ground: (MT
model)Is the resistance less than 5
Ω?Go to step 3.Repair open circuit
in harness
between ECM
connector and
engine ground ter-
minal.
3 CHECK INPUT VOLTAGE OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 19 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 4.Repair open or
ground short cir-
cuit of power sup-
ply circuit.
4 CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B137) No. 14 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 5.Repair open or
ground short cir-
cuit of power sup-
ply circuit.
5 CHECK INPUT VOLTAGE OF MAIN RELAY.
Measure the voltage between main relay con-
nector and chassis ground.
Connector & terminal
(B47) No. 1 (+) — Chassis ground (
−):
(B47) No. 5 (+) — Chassis ground (
−):
(B47) No. 6 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 6.Repair open or
ground short cir-
cuit of power sup-
ply circuit.
6 CHECK INPUT VOLTAGE OF ECM.
1) Connect the main relay and ECM connec-
tor.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B135) No. 5 (+) — Chassis ground (
−):
(B135) No. 6 (+) — Chassis ground (
−):
(B137) No. 16 (+) — Chassis ground (
−):Is the voltage more than 10 V? Check ignition
control system.
EN(H4DOTC)-65,
IGNITION CON-
TROL SYSTEM,
Diagnostics for
Engine Starting
Fa il u r e. >Repair open or
ground short cir-
cuit in harness
between ECM
connector and
main relay connec-
tor.

Page 1695 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-65
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
D: IGNITION CONTROL SYSTEM
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)

Page 1696 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-66
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
RHD model
EN-02315
SBF-4SBF-1
B135
18
17
16
15
ECM
No.11
E
E
41
E31
E31
E32
E33
E34IGNITION COIL
No.1IGNITION COIL
No.2IGNI

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