Subaru Forester 2004 Service Manual page 57

ENGINE (DIAGNOSTIC)
Step
1 CHECK BATTERY.
Check the battery voltage.
2 CHECK OPERATION OF STARTER MOTOR. Does the starter motor oper-
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 (
NOTE:
• For AT model, shift the select lever to "P" or
"N" range.
• For MT model, depress the clutch pedal.
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.
5 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Disconnect the connector from ignition
switch.
2) Measure the power supply voltage between
ignition switch connector and chassis ground.
Connector & terminal
(B72) No. 1 (+) — Chassis ground (
6 CHECK IGNITION SWITCH.
1) Disconnect the connector from ignition
switch.
2) Measure the resistance between ignition
switch terminals while turning the ignition
switch to START.
Terminals
No. 1 — No. 3:
Diagnostics for Engine Starting Failure
Is the voltage more than 12 V? Go to step 2.
ate?
Is the voltage more than 10 V? Go to step 4.
−
):
Is the resistance less than 5
Ω?
Is the voltage more than 10 V? Go to step 6.
−
):
Is the resistance less than 5
Ω?
EN(H4DOTC 2.5)-56
Check
Check ECM power
supply and ground
line. <Ref. to
EN(H4DOTC 2.5)-
57, CHECK
POWER SUPPLY
AND GROUND
LINE OF ENGINE
CONTROL MOD-
ULE (ECM), Diag-
nostics for Engine
Starting Failure.>
Check the starter
motor. <Ref. to
SC(H4SO)-6,
Starter.>
Repair the poor
contact in ignition
switch.
Yes No
Charge or replace
the battery.
Go to step 3.
Go to step 5.
Repair open circuit
of ground cable.
Repair open circuit
in harness
between ignition
switch and bat-
tery, and check
fuse SBF No. 4
and SBF No. 1.
Replace the igni-
tion switch.