Subaru IMPREZA GD 2007 Series Manual page 1618

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
15 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR.
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 the ECM and
chassis ground for 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 (–):
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:
17 CHECK INSTALLATION OF CAMSHAFT PO-
SITION SENSOR/CRANKSHAFT POSITION
SENSOR.
18 CHECK CRANK SPROCKET.
Remove the timing belt cover.
19 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft, and align alignment mark
on crank sprocket with alignment mark on cylin-
der block.
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. 1 and
No. 3 of electronic throttle control relay.
4) Measure the resistance between electronic
throttle control relay terminals.
Terminals
No. 2 — No. 4:
21 CHECK POWER SUPPLY OF ELECTRONIC
THROTTLE CONTROL RELAY.
Measure the voltage between electronic throttle
control relay connector and chassis ground.
Connector & terminal
(B309) No. 2 (+) — Chassis ground (–):
22 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RELAY.
1) Disconnect the connectors from the ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B309) No. 3 (+) — Chassis ground (–):
Check
Is the voltage 10 V or more?
Is the resistance less than 1 Ω? Replace the faulty
Is the camshaft position sensor
or crankshaft position sensor
loosely installed?
Is the crank sprocket rusted or
does it have damaged teeth?
Is the timing belt dislocated
from its proper position?
Is the resistance less than 1 Ω? Go to step 21.
Is the voltage 10 V or more?
Is the voltage 10 V or more?
EN(STI)(diag)-287
ENGINE (DIAGNOSTICS)
Yes No
Repair the short Go to step 16.
circuit to power in
the harness
between the ECM
and fuel injector.
Go to step 17.
fuel injector. <Ref.
to FU(H4DOTC)-
37, Fuel Injector.>
Tighten the cam- Go to step 18.
shaft position sen-
sor or crankshaft
position sensor.
Replace the crank Go to step 19.
sprocket. <Ref. to
ME(H4DOTC)-57,
Crank Sprocket.>
Go to step 20.
Repair the installa-
tion condition of
timing belt. <Ref. to
ME(H4DOTC)-48,
Timing Belt.>
Replace the elec-
tronic throttle con-
trol relay.
Go to step 22. Repair the open or
ground short circuit
of power supply
circuit.
Go to step 23.
Repair the short
circuit to power in
the harness
between ECM and
electronic throttle
control relay.