Subaru 2009 IMPREZA Service Manual page 689

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
15 CHECK FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between fuel injec-
tor terminals on faulty cylinder.
Terminals
No. 1 — No. 2:
16 CHECK INSTALLATION CONDITION OF
CAMSHAFT POSITION SENSOR/CRANK-
SHAFT POSITION SENSOR.
17 CHECK CRANK SPROCKET.
Remove the timing belt cover. <Ref. to
ME(H4SO)-48, REMOVAL, Timing Belt Cover.>
18 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft using ST, and align the
alignment mark on crank sprocket with align-
ment mark on cylinder block.
ST 499987500
19 CHECK ELECTRONIC THROTTLE CON-
TROL RELAY.
1) Turn the ignition switch to OFF.
2) Remove the electronic throttle control relay.
3) Connect the battery to terminals No. 31 and
No. 32 of electronic throttle control relay.
4) Measure the resistance between electronic
throttle control relay terminals.
Terminals
No. 29 — No. 30:
20 CHECK POWER SUPPLY OF ELECTRONIC
THROTTLE CONTROL RELAY.
Measure the voltage between electronic throttle
control relay connector and chassis ground.
Connector & terminal
(B220) No. 29 (+) — Chassis ground (–):
21 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
1) Disconnect the connectors from ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B220) No. 32 (+) — Chassis ground (–):
Is the resistance less than 1 ? Replace the faulty
Is the camshaft position sensor
or crankshaft position sensor
loosely installed?
Is the crank sprocket rusted or
does it have broken teeth?
Is the timing belt dislocated
from its proper position?
CRANKSHAFT
SOCKET
Is the resistance less than 1 ? Go to step 20.
Is the voltage 10 V or more?
Is the voltage 10 V or more?
EN(H4SO)(diag)-272
Check Yes
fuel injector. <Ref.
to FU(H4SO)-36,
Fuel Injector.>
Tighten the cam-
shaft position sen-
sor or crankshaft
position sensor.
<Ref. to
FU(H4SO)-28,
INSTALLATION,
Camshaft Position
Sensor.> <Ref. to
FU(H4SO)-26,
INSTALLATION,
Crankshaft Posi-
tion Sensor.>
Replace the crank
sprocket. <Ref. to
ME(H4SO)-56,
Crank Sprocket.>
Repair the installa-
tion condition of
timing belt. <Ref. to
ME(H4SO)-49,
Timing Belt.>
Go to step 21.
Repair the short
circuit to power in
the harness
between ECM and
electronic throttle
control relay con-
nector.
No
Go to step 16.
Go to step 17.
Go to step 18.
Go to step 19.
Replace the elec-
tronic throttle con-
trol relay. <Ref. to
FU(H4SO)-50,
Electronic Throttle
Control Relay.>
Repair the open or
ground short circuit
of power supply
circuit.
Go to step 22.