Subaru Legacy 2005 Service Manual page 1388

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 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).
3) Turn the ignition switch to ON.
2 CHECK PURGE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from purge con-
trol solenoid valve.
3) Measure the resistance between purge
control solenoid valve terminals.
Terminals
No. 1 — No. 2:
3 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 con-
trol solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 14 (+) — Chassis ground (
4 CHECK POOR CONTACT.
Check poor contact in ECM connector.
AO:DTC P0500 VEHICLE SPEED SENSOR "A"
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
37, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-30, PROCE-
DURE, Inspection Mode.>.
Step
1 CHECK DTC OF ABS.
Check DTC of ABS.
Check
Does the purge control sole-
noid valve operate?
Is the resistance less than 29
— 35Ω?
Is the voltage less than 1 V?
−
):
Is there poor contact in ECM
connector?
Check
Is DTC of ABS displayed?
EN(H4DOTC)(diag)-148
Yes
Go to step 2. Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair the
poor contact in
ECM connector.
Go to step 3. Replace the purge
control solenoid
valve. <Ref. to
EC(H4DOTC)-6,
Purge Control
Solenoid Valve.>
Go to step 4. Repair the battery
short circuit of har-
ness between
ECM and purge
control solenoid
valve connector.
After repair,
replace the ECM.
<Ref. to
FU(H4DOTC)-34,
Engine Control
Module (ECM).>
Repair the poor Replace the ECM.
contact in ECM <Ref. to
connector. FU(H4DOTC)-34,
Engine Control
Module (ECM).>
Yes
Perform the diag- Repair the poor
nosis according to contact in ECM.
DTC. <Ref. to
ABS(diag)-38, List
of Diagnostic Trou-
ble Code (DTC).>
No
No