Subaru 2009 IMPREZA, Service Manual

Page: 1293 / 3619

EN(H4DOTC)(diag)-72
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
15 CHECK INPUT VOLTAGE OF INHIBITOR
SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from inhibitor
switch.
3) Connect the starter relay and ECM.
4) Measure the input voltage between inhibitor
switch connector and engine ground after turn-
ing the ignition switch to START position.
Connector & terminal
(T7) No. 6 (+) — Engine ground (–):
Is the voltage 10 V or more? Go to step 16 . Repair the open
circuit in harness
between inhibitor
switch connector
and starter relay
connector.
16 CHECK INHIBITOR SWITCH.
1) Place the select lever in “P” range or “N”
range.
2) Measure the resistance between inhibitor
switch terminals.
Connector & terminal
No. 6 — No. 9:
Is the resistance less than 1
:
? Go to step 17 . Replace the inhibi-
tor switch. <Ref. to
4AT-48, Inhibitor
Switch.>
17 CHECK HARNESS BETWEEN INHIBITOR
SWITCH AND STARTER MOTOR.
Measure the resistance of harness between the
inhibitor switch connector and starter motor.
Connector & terminal
(T7) No. 9 — (B14) No. 1:
Is the resistance less than 1
:
? Check the engine
control module
(ECM) power sup-
ply and ground
line. <Ref. to
EN(H4DOTC)(dia
g)-73, CHECK
POWER SUPPLY
AND GROUND
LINE OF ENGINE
CONTROL MOD-
ULE (ECM), Diag-
nostics for Engine
Starting Failure.>
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open or ground
short circuit of har-
ness between in-
hibitor switch
connector and
starter motor
• Poor contact of
coupling connector
Step Check Yes No