Subaru IMPREZA 2002 Service Manual page 603

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
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(S0HC)-44, Compulsory Valve Operatior
Check Mode.>
Connector & terminal
(8134) No. 1 (+)
-
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
CHECK POOR CONTACT.
Check poor contact in ECM connector.
(8134) No. 1 (+)
-
Chassis ground (-) :
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
(8134) No. 1 (+)
-
Chassis
ground
( - ) :
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 :
Check poor contact in ECM connector.
Check
Ioes the voltage change
letween 0 and 10 V?
s the voltage more than 10 V?
s there poor contact in ECM
:onnector?
s the voltage more than 10 V?
s the resistance less than 1
2?
s there poor contact in ECM
:onnector?
Yes
; o to step 2.
G o to step 4.
3epair poor con-
act in ECM con-
lector.
3epair battery
;hort circuit in har.
less between
ICM and fuel tank
xessure control
;olenoid valve
:onnector. After
epair, replace the
ICM. <Ref. to
ingine Control
Aodule.>
3eplace the fuel
ank pressure con
rol solenoid valve
:Ref. to
'ressure Control
Solenoid Valve.>
ind ECM <Ref. to
fngine Control
dodu1e.s
3epair poor con-
act in ECM con-
lector.
'U(SOHC)-47,
IC(S0HC)-11 ,
'U(SOHC)-47,
No
Even if MIL light
up, the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair poor
contact in ECM
connector.
Go to step 3 .
Replace the ECM
<Ref. to
Engine Control
Module.>
Go to step 5.
FU(S0HC)-47,
Go to step 6.
Replace the ECM
<Ref. to
Engine Control
Module.>
FU(S0HC)-47,
EN( SOHC)-279