Subaru 2002 IMPREZA Service Manual page 444

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
CHECK HARNESS BETWEEN ECM AND
COUPLING CONNECTOR IN REAR WIRING
HARNESS.
1)Turn the ignition switch to OFF.
2)Remove the rear seat cushion (Sedan) or
move rear seat cushion (Wagon).
3)Separate rear wiring harness and fuel tank
cord.
4)Turn the ignition switch to ON.
5)Measure the voltage between rear wiring
harness connector and chassis ground.
Connector & terminal
(R15) No. 9 (+)
-
Chassis ground (-):
CHECK HARNESS BETWEEN ECM AND
COUPLING CONNECTOR IN REAR WIRING
HARNESS.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
ECM and rear wiring harness connector.
Connector & terminal
(6135) NO. 19
-
(R15)
NO.
11:
CHECK HARNESS BETWEEN ECM AND
COUPLING CONNECTOR IN REAR WIRING
HARNESS.
Measure the resistance of harness between
rear wiring harness connector and chassis
ground.
Connector & terminal
(R15) No. 11
-
Chassis ground:
1)Disconnect the connector from fuel tank
pressure sensor.
2)Measure the resistance of fuel tank cord.
3 CHECK FUEL TANK CORD.
Connector & terminal
(R57) NO. 9
-
(R47)
NO.
3:
I O
CHECK FUEL TANK CORD.
Measure the resistance of fuel tank cord.
Connector & terminal
(R57) NO. 11
-
(R47)
NO.
1:
I1 CHECK FUEL TANK CORD.
Measure the resistance of harness between
fuel tank pressure sensor connector and chas
sis ground.
Connector & terminal
(R47) No. 2
-
Chassis ground:
12 CHECK POOR CONTACT.
Check poor contact in fuel tank pressure sen-
sor connector.
Check
j
the voltage more than 4.5 V?
s the resistance less than
1
2?
s the resistance more than
500 kR?
s the resistance less than
1
2?
s the resistance less than 1
3?
s the resistance more than
500 kR?
s there poor contact in fuel
ank pressure sensor connec-
or?
Yes
; o to step
7.
20
to step 0.
30 to step 9.
30 to step 10.
So to step 11.
Go to step 12.
Repair poor con-
tact in fuel tank
pressure sensor
connector.
No
3epair harness
and connector.
UOTE:
n this case, repair
he following:
1
Open circuit in
iarness between
X M and rear wir-
ng harness con-
lector
1
Poor contact in
:oupling connector
3epair harness
3nd connector.
VOTE:
In this case, repair
:he following:
1
Open circuit in
iarness between
ECM and rear wir-
ng harness con-
lector
1
Poor contact in
2oupling connector
Poor contact in
loint connector
Repair ground
short circuit in har-
ness between
ECM and rear wir-
ing harness con-
nector.
Repair open circuit
in fuel tank cord.
Repair open circuit
in fuel tank cord.
Repair ground
short circuit in fuel
tank cord.
Replace the fuel
tank pressure sen.
sor. <Ref. to
EC(D0HC
TURBO)-1 1, Fuel
Tank Pressure
Sensor.
>
EN(D0HC TURBO)-220