Subaru IMPREZA 2002 Service Manual page 527

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 drain valve, measure
voltage between ECM and chassis ground.
NOTE:
Drain valve operation can be excecuted usin!
Subaru Select Monitor. For procedure, refer t c
"Compulsory Valve Operation Check Mode"
<Ref. to EN(S0HC)-44, Compulsory Valve Op
eration Check Mode.>
Connector & terminal
(8134) No. 10 (+)
-
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. 10 (+)
-
Chassis ground ( - ) :
Yes
CHECK HARNESS BETWEEN DRAIN
VALVE AND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from drain valve.
3)Turn the ignition switch to
ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8134) No. 10 (+)
-
Chassis ground ( - ) :
s the voltage more than
10 V?
I
CHECK DRAIN VALVE.
1)Turn the ignition switch to OFF.
2)Measure the resistance between drain valve
terminals.
Terminals
NO. 1 -NO. 2:
Go to step
4.
I
CHECK POOR CONTACT.
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? Check poor contact in ECM connector.
Repair poor con-
tact in ECM con-
nector.
Repair battery
short circuit in har-
ness between
ECM and drain
valve connector.
After repair,
replace the ECM.
<Ref. to
Engine Control
Module.>
Replace the drain
valve <Ref. to
Drain Valve.> and
ECM <Ref. to
Engine Control
Module.>
Repair poor con-
tact in ECM con-
nector.
FU(S0HC)-47,
EC(SOHC)-16,
FU(S0HC)-47,
No
Iven if MIL light
ip, the circuit has
eturned to a nor-
nal condition at
his time. In this
:ase, repair poor
:ontact in ECM
:onnector.
20
to step 5.
Ieplace the ECM.
:Ref. to
Ingine Control
Aodule.>
;o to step 5.
'U(SOHC)-47,
So
to step 6.
Ieplace the ECM.
:Ref. to
Ingine Control
vlodule.>
'U (S0HC)-47,
EN(S0HC)-203