Subaru 2002 IMPREZA Service Manual page 555

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
Step
CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to OFF.
2)Connect the test mode connector at the
lower portion of instrument panel (on the
driver's side), to the side of the center console
box.
3)Turn the ignition switch to ON.
4)While operating the fuel tank pressure con-
trol solenoid valve, measure voltage between
ECM and chassis ground.
NOTE:
Fuel tank pressure control solenoid valve oper.
ation can be executed using Subaru Seleci
Monitor. For procedure, refer to "Compulsor)
Valve Operation Check Mode". <Ref. tc
EN(D0HC TURBO)-50, Compulsory Valve O p
eration Check Mode.>
Connector & terminal
(8137) No. 22 (+)
-
Chassis ground (-):
!
CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8137) No. 22 (+)
-
Chassis ground ( - ) :
1 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Yes
CHECK HARNESS BETWEEN FUEL TANK
PRESSURE CONTROL SOLENOID VALVE
AND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from fuel tank
pressure control solenoid valve.
3)Turn the ignition switch to ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8137) No. 22 (+)
-
Chassis ground ( - ) :
)oes voltage change between
1
and 10 V?
1
CHECK FUEL TANK PRESSURE CONTROL
SOLENOID VALVE.
1)Turn the ignition switch to OFF.
2)Measure the resistance between fuel tank
pressure control solenoid valve terminals.
Terminals
NO. 1 -NO. 2:
I
Go to step 2.
i CHECK POOR CONTACT.
Check poor contact in ECM connector.
s the voltage more than 10 V?
s the resistance less than 1
2?
s
there poor contact in ECM
:onnector?
Repair battery
short circuit in har.
ness between
ECM and fuel tank
pressure control
solenoid valve
connector. After
repair, replace the
ECM. <Ref. to
FU(D0HC
Engine Control
Module.>
Replace the fuel
tank pressure con,
trot solenoid valve
<Ref. to EC(D0HC
TURBO)-12, Pres
sure Control Sole-
noid Valve.> and
ECM <Ref. to
FU(D0HC
Engine Control
Module.>
Repair poor con-
tact in ECM con-
nector.
TURBO)-47,
TURBO)-47,
s the voltage more than 10 V? So
to step 4.
onnector? tact in ECM con-
nector.
I
No
3 e n if MIL lights
rp, the circuit has
eturned to a nor-
nal condition at
his time. In this
:ase, repair poor
:ontact in ECM
:onnector.
20 to step 3 .
3eplace the ECM.
:Ref. to FU(D0HC
ru
RBO)-47,
Engine Control
dodule.>
20 to step 5.
20
to step 6.
3eplace the ECM.
:Ref. to FU(D0HC
TURBO)-47,
Engine Control
vlodule.>
EN(D0HC TURBO)-331