Subaru Impreza 2002 Service Manual page 167

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK HARNESS BETWEEN ECM AND
VARIABLE VALVE TIMING SOLENOID
VALVE.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM and
variable valve timing solenoid valve.
3)Measure the resistance between ECM and
variable valve timing solenoid valve.
Connector & terminal
(B84) No. 6 — (E38) No. 1:
(B84) No. 12 — (E38) No. 2:
2 CHECK HARNESS BETWEEN ECM AND
VARIABLE VALVE TIMING SOLENOID
VALVE.
Measure the resistance between ECM and
variable valve timing solenoid valve.
Connector & terminal
(E38) No. 1 — Engine ground:
(E38) No. 2 — Engine ground:
3 CHECK VARIABLE VALVE TIMING SOLE-
NOID VALVE.
1)Remove the variable valve timing solenoid
valve.
2)Measure the resistance between variable
valve timing solenoid valve terminal.
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1M
Ω?
Is the resistance between 6
and 12 Ω?
EN(TURBO)-31
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Repair the open
circuit in harness
between ECM and
variable valve tim-
ing solenoid valve
connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and variable
valve timing sole-
noid valve connec-
tor
• Poor contact in
coupling connec-
tor.
Go to step 3. Repair the short
circuit between
ECM and variable
valve timing sole-
noid valve connec-
tor.
Repair the poor Replace the vari-
contact in ECM able valve timing
and variable valve solenoid valve.
timing solenoid <Ref. to ME(STi)-
valve. 59, Camshaft.>
No