Subaru 2009 IMPREZA Service Manual page 1396

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
6 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 (–):
7 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:
8 CHECK INSTALLATION OF CAMSHAFT PO-
SITION SENSOR/CRANKSHAFT POSITION
SENSOR.
9 CHECK CRANK SPROCKET.
Remove the timing belt cover.
10 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft, and align alignment mark
on crank sprocket with alignment mark on cylin-
der block.
ST 499987500
11 CHECK FUEL LEVEL.
12 CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Clear the memory using the Subaru Select
Monitor or general scan tool. <Ref. to
EN(H4DOTC)(diag)-54, Clear Memory Mode.>
2) Start the engine, and drive the vehicle 10
minutes or more.
Is the voltage 10 V or more?
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 fuel meter indication
higher than the "Lower" level?
Does the malfunction indicator
light illuminate or blink?
EN(H4DOTC)(diag)-175
Check Yes
Repair the short
circuit to power in
harness between
ECM and fuel
injector connector.
fuel injector. <Ref.
to FU(H4DOTC)-
41, Fuel Injector.>
Tighten the cam-
shaft position sen-
sor or crankshaft
position sensor.
Replace the crank
sprocket. <Ref. to
ME(H4DOTC)-60,
Crank Sprocket.>
Repair the installa-
tion condition of
timing belt. <Ref. to
ME(H4DOTC)-50,
Timing Belt.>
Go to step 12.
Go to step 14.
ENGINE (DIAGNOSTICS)
No
Go to step 7.
Go to step 8.
Go to step 9.
Go to step 10.
Go to step 11.
Replenish the fuel
so that fuel meter
indication is higher
than the "Lower"
level. After replen-
ishing fuel, Go to
step 12.
Go to step 13.