Subaru IMPREZA 2002 Service Manual page 549

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Yes
30 to step 3.
30 to step 4.
~
Step
CHECK INPUT SIGNAL FOR ECM.
1)Turn the ignition switch to ON. (Engine OFF)
2)Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(8136) No. 27 (+)
-
Chassis ground (-):
No
Even if MIL lights
up, the circuit has
returned
to
a nor-
mal condition at
this time. A tempo.
rary poor contact
of the connector
may be the cause.
NOTE:
In this case, repaii
the following:
Poor contact in
fuel pump connec-
tor
Poor contact in
coupling connectoi
(B22, B99 and
R57)
Repair battery
short circuit
between ECM and
combination meter
connector.
CHECK INPUT VOLTAGE OF ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the combination meter connector
( i l 0) and ECM connector.
3)Turn the ignition switch to ON.
4)Measure the voltage of harness between
ECM and chassis ground.
Connector & terminal
(8136) No. 27 (+)
-
Chassis ground (-):
CHECK HARNESS BETWEEN ECM AND
FUEL TANK CORD.
1)Turn the ignition switch to OFF.
2)Separate fuel tank cord connector (R57) and
rear wiring harness connector (R15).
3)Measure the resistance between ECM and
fuel tank cord.
Connector & terminal
(8136) NO. 27
-
(R15) NO. 3:
I
CHECK HARNESS BETWEEN FUEL TANK
CORD AND CHASSIS GROUND.
Measure the resistance between fuel tank cord
and chassis ground.
Connector & terminal
(R15) No. 8
-
Chassis ground:
30 to step 5.
i
CHECK FUEL TANK CORD.
1)Disconnect the connector from fuel level sen-
sor.
2)Measure the resistance between fuel level
sensor and coupling connector.
Connector & terminal
.
(R57) NO. 8
-
(R58)
NO.
2:
CHECK FUEL TANK CORD.
1)Disconnect the connector from fuel sub level
sensor.
2)Measure the resistance between fuel level
sensor and fuel sub level sensor.
Connector & terminal
(R58) NO. 3
-
(R59)
NO.
2:
Repair open circuil
between ECM and
fuel tank cord.
Check
s the voltage more than 4.75
I?
30 to step 6.
30 to step 7.
s the voltage more than 4.75
I?
Repair open circuii
between fuel tank
cord and chassis
ground.
NOTE:
In this case, repai
the following:
Poor contact in
coupling connec-
tors (822 and B99
Repair open circuii
between coupling
connector and fuel
level sensor.
s the resistance less than 5
2?
s
the resistance less than 5
2?
s
the resistance less than 10
3?
s the resistance less than 10
2?
between fuel level
sensor and fuel
sub level sensor.
EN(S0HC)-225