Subaru IMPREZA 2002 Service Manual page 490

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE IDIAGNOSTICS)
Replace the faulty
fuel injector <Ref.
Step
CHECK POWER SUPPLY LINE.
1)Turn the ignition switch to ON.
2)Measure the voltage between fuel injector
and engine ground on faulty cylinders.
Connector & terminal
#1 (€5) No. 2 (+)
-
Engine ground ( - ) :
#2 (€16) No. 2 (+)
-
Engine ground ( - ) :
#3 (E6) No. 2 (+)
-
Engine ground ( - ) :
#4 (El 7) No. 2 (+)
-
Engine ground ( - ) :
Go to step 9.
CHECK HARNESS BETWEEN FUEL INJEC-
TOR AND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from fuel injector
on faulty cylinder.
3)Turn the ignition switch to ON.
4)Measure the voltage between ECM connec-
tor and chassis ground on faulty cylinders.
Connector & terminal
#1 (8134) No. 4 (+)
-
Chassis
ground ( - ) :
#2 (8134) No. 13 (+)
-
Chassis
ground ( - ) :
#3 (8134) No. 14 (+)
-
Chassis
ground ( - ) :
#4 (8134) No. 15 (+)
-
Chassis
ground ( - ) :
CHECK FUEL INJECTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance between fuel injector
terminals on faulty cylinder.
Terminals
NO. 1 -NO. 2:
to FU(S0HC)-38,
Fuel Injector.> and
ECM <Ref. to
Engine Control
Module.>
Tighten camshaft
position sensor or
crankshaft posi-
tion sensor.
Replace the crank-
shaft sprocket.
<Ref. to
Crankshaft
Sprocket.>
Repair installation
condition of timing
belt. <Ref. to
Timing Belt
Assembly.>
FU(S0HC)-47,
ME(S0HC)-54,
ME(S0HC)-47,
CHECK INSTALLATION OF CAMSHAFT PO-
SITION SENSOWCRANKSHAFT POSITION
SENSOR.
Go to step 10.
Go to step 11.
Go to step 12.
CHECK CRANKSHAFT SPROCKET.
Remove the timing belt cover.
CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft using ST, and align align-
ment mark on crankshaft sprocket with align-
ment mark on cylinder block.
ST 499987500 CRANKSHAFT SOCKET
Check
s the voltage more than 10 V?
s the voltage more than 10 V?
s the resistance less than 1
a?
s the camshaft position sensor
)r crankshaft position sensor
oosely installed?
s the crankshaft sprocket
usted or does it have broken
eeth?
s the timing belt dislocated
rom its proper position?
Yes
Repair poor con-
tact in all connec-
tors in fuel injector
circuit.
Pepair battery
short circuit in har-
nessbetween
ECM and fuel
injector. After
repair, replace the
ECM. <Ref. to
Engine Control
Module.>
FU(S0HC)-47,
No
Repair harness
and connector.
NOTE:
In this case, repaii
the following:
Open circuit in
harness between
main relay and fuel
injector connector
on faulty cylinders
Poor contact in
coupling connectoi
Poor contact in
main relay connec.
tor
Poor contact in
fuel injector con-
nector on faulty
cylinders
Go to step 8.
EN(S0HC)-166