Subaru IMPREZA 2002 Service Manual page 521

b
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 purge control solenoid
valve, measure voltage between ECM and
chassis ground.
NOTE:
Purge control solenoid valve operation can bc
executed using Subaru Select Monitor. For pro,
cedure, refer to "Compulsory Valve Operatior
Check Mode". <Ref. to EN(S0HC)-44, Compul
sory Valve Operation Check Mode.>
Connector & terminal
(6134) No. 2 (+)
-
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.
(6134) No. 2 (+)
-
Chassis ground (-):
CHECK HARNESS BETWEEN PURGE CON
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from purge control
solenoid valve.
3)Turn the ignition switch to
ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(6134) No. 2 (+)
-
Chassis ground (-):
I
CHECK PURGE CONTROL SOLENOID
VALVE.
1)Turn the ignition switch to OFF.
2)Measure the resistance between purge con-
trol solenoid valve terminals.
Terminals
NO. 1 -NO. 2:
i
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Check
)oes the voltage change
ietween 0 and 10 V?
s the voltage more than 10 V S
s there poor contact in ECM
:onnector?
s the voltage more than 10 VI
s the resistance less than 1
3?
s there poor contact in ECM
:onnector?
Yes
30 to step
2.
20 to step 4.
3epair poor con-
act in ECM con-
lector.
3epair battery
short circuit in har-
less between
X M and purge
:ontrol solenoid
dalve connector.
aifter repair,
.eplace the ECM.
:Ref. to
Engine Control
Module.>
9eplace the purge
:ontrol solenoid
rlalve <Ref. to
Purge Control
Solenoid Valve.>
2nd ECM <Ref. to
Engine Control
Module.>
=U(SOHC)-47,
EC(S0HC)-6,
FU(S0HC)-47,
Repair poor con-
tact in ECM con-
nector.
No
iven if MIL light
p, the circuit has
eturned to a nor-
ial condition at
lis time. In this
ase, repair poor
ontact in ECM
onnector.
; o to step 3.
leplace the ECM.
:Ref. to
3gine Control
nodule.>
30 to step 5.
'U(SOHC)-47,
20 to step 6.
3eplace the ECM.
:Ref. to
ingine Control
dodule.>
W(SOHC)-47,
EN(S0HC)-197