Subaru 2009 IMPREZA, Service Manual

Page: 1503 / 3619

EN(H4DOTC)(diag)-282
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
15 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector
on faulty cylinders.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground on faulty cylinders.
Connector & terminal
#1 (B137) No. 8 (+) — Chassis ground (–):
#2 (B137) No. 9 (+) — Chassis ground (–):
#3 (B137) No. 10 (+) — Chassis ground (–):
#4 (B137) No. 11 (+) — Chassis ground (–):
Is the voltage 10 V or more? Repair the short
circuit to power in
harness between
ECM and fuel
injector connector. Go to step 16 .
16 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:
Is the resistance less than 1
:
? Replace the faulty
fuel injector. <Ref.
to FU(H4DOTC)-
41, Fuel Injector.>
Go to step 17 .
17 CHECK INSTALLATION OF CAMSHAFT PO-
SITION SENSOR/CRANKSHAFT POSITION
SENSOR. Is the camshaft position sensor
or crankshaft position sensor
loosely installed? Tighten the cam-
shaft position sen-
sor or crankshaft
position sensor. Go to step 18 .
18 CHECK CRANK SPROCKET.
Remove the timing belt cover. <Ref. to
ME(H4DOTC)-49, REMOVAL, Timing Belt
Cover.>
Is the crank sprocket rusted or
does it have broken teeth? Replace the crank
sprocket. <Ref. to
ME(H4DOTC)-60,
Crank Sprocket.> Go to step 19 .
19 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
CRANKSHAFT
SOCKET
Is the timing belt dislocated
from its proper position? Repair the installa-
tion condition of
timing belt. <Ref. to
ME(H4DOTC)-50,
Timing Belt.> Go to step 20 .
20 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:
Is the resistance less than 1
:
? Go to step 21 . Replace the elec-
tronic throttle con-
trol relay. <Ref. to
FU(H4DOTC)-57,
Electronic Throttle
Control Relay.>
21 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 (–):
Is the voltage 10 V or more? Go to step 22 . Repair the open or
ground short circuit
of power supply
circuit.
22 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY CONNECTOR.
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 voltage 10 V or more? Repair the short
circuit to power in
the harness
between ECM and
electronic throttle
control relay con-
nector. Go to step 23 .
Step Check Yes No