Subaru 2009 IMPREZA, Service Manual

Page: 1291 / 3619

EN(H4DOTC)(diag)-70
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
Step Check Yes No
1 CHECK BATTERY.
Check the battery voltage.
Is the voltage 12 V or more? Go to step 2 . Charge or replace
the battery.
2 CHECK OPERATION OF STARTER MOTOR. Does the starter motor oper-
ate? Go to step 3 . Go to step 4 .
3 CHECK DTC. Is DTC displayed? <Ref. to
EN(H4DOTC)(diag)-42,
OPERATION, Read Diagnostic
Trouble Code (DTC).> Check the appropri-
ate DTC using the
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4DOTC)(diag)
-83, List of Diagnos-
tic Trouble Code
(DTC).> The circuit has
returned to a nor-
mal condition at
this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.
4 CHECK INPUT SIGNAL FOR STARTER MO-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from starter
motor.
3) On AT models, set the select lever to the “P”
range or “N” range, and on MT models, depress
the clutch pedal.
4) Turn the ignition switch to START.
5) Measure the voltage between the starter
motor connector and the engine ground.
Connector & terminal
(B14) No. 1 (+) — Engine ground (–):
Is the voltage 10 V or more? Check the starter
motor. <Ref. to
SC(H4SO)-7,
Starter.> Go to step 5 .
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 voltage between ignition
switch connector and chassis ground.
Connector & terminal
(B72) No. 3 (+) — Chassis ground (–):
Is the voltage 10 V or more? Go to step 6 . Check the follow-
ing item and repair
if necessary.
• Blown out of fuse
• Open or short
circuit to ground in
harness between
ignition switch con-
nector and battery
6 CHECK IGNITION SWITCH.
Measure the resistance between ignition switch
terminals after turning the ignition switch to
START position.
Terminals
No. 3 — No. 2:
No. 3 — No. 6:
Is the resistance less than 1
:
? Go to step 7 . Replace the igni-
tion switch. <Ref.
to SL-44,
REPLACEMENT,
Ignition Key Lock.>
7 CHECK INPUT VOLTAGE OF STARTER RE-
LAY.
1) Remove the starter relay.
2) Connect the connector to ignition switch.
3) Measure the voltage between starter relay
connector and chassis ground after turning the
ignition switch to START position.
Connector & terminal
(B225) No. 9 (+) — Chassis ground (–):
(B225) No. 11 (+) — Chassis ground (–):
Is the voltage 10 V or more? Go to step 8 . Check the follow-
ing item and repair
if necessary.
• Open or short
circuit to ground in
harness between
starter relay con-
nector and ignition
switch connector
• Blown out of fuse