Subaru 2002 IMPREZA Service Manual page 439

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Yes
Go to step 2.
Step
I 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 using
Subaru Select Monitor. For procedure, refer to
"Compulsory Valve Operation Check Mode".
<Ref. to EN(D0HC TURBO)dO, Compulsory
Valve Operation Check Mode.>
Connector & terminal
(8137)
No.
11 (+)
-
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. 11 (+)
-
Chassis ground (-):
j
CHECK POOR CONTACT.
Check poor contact in ECM connector.
No
Even if MIL lights
up, the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair poor
contact in ECM
connector.
I 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
(B137) No. 11 (+)
-
Chassis ground ( - ) :
s there poor contact in ECM
:onnector?
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 :
Repair poor con-
tact in ECM con-
Replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
Go to step 5.
nector. TURBO)-47,
Repair battery
i CHECK POOR CONTACT.
Check poor contact in ECM connector.
s
the resistance less than 1
2?
s there poor contact in ECM
:onnector?
Check
Ioes the voltage change
letween 0 and 10 V?
short circuit in har-
ness between
ECM and drain
valve connector.
After repair,
replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
Replace the drain Go to step 6.
valve <Ref. to
EC(D0HC
TURBO)-I 7, Drain
Valve.> and ECM
<Ref. to FU(D0HC
Engine Control
Module.>
Repair poor con-
tact in ECM con-
TURBO)-47,
TURBO)-47,
Replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
nector. TURBO)-47,
s
c
the voltage more than 10 V? Go to step 4. Go to step 3 .
EN(D0HC TURBO)-21 5