Subaru FORESTER 2001 Service Manual page 204

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to OFF.
2) Connect 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 ignition switch to ON.
4) While operating purge control solenoid
valve, measure voltage between ECM and
chassis ground.
NOTE:
Purge control solenoid valve operation can be
executed using Subaru Select Monitor. For
procedure, refer to "Compulsory Valve Opera-
tion Check Mode". <Ref. to EN(DOHC
TURBO)-48, Compulsory Valve Operation
Check Mode.>
Connector & terminal
(B137) No. 16 (+) — Chassis ground
(−):
2 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B137) No. 16 (+) — Chassis ground
(−):
3 CHECK POOR CONTACT.
Check poor contact in ECM connector.
4 CHECK HARNESS BETWEEN PURGE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from purge control
solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B137) No. 16 (+) — Chassis ground
(−):
5 CHECK PURGE CONTROL SOLENOID
VALVE.
1) Turn ignition switch to OFF.
2) Measure resistance between purge control
solenoid valve terminals.
Terminals
No. 1 — No. 2:
Step
Does voltage change
between 0 and 10 V?
Is the voltage more than 10
V?
Is there poor contact in
ECM connector?
Is the voltage more than 10
V?
Is the resistance less than
1 Ω?
EN(DOHC TURBO)-203
Check Yes
Go to step 2.
Go to step 4.
Repair poor con-
tact in ECM con-
nector.
Repair battery
short circuit in
harness between
ECM and purge
control solenoid
valve connector.
After repair,
replace ECM.
<Ref. to
FU(DOHC
TURBO)-47,
Engine Control
Module.>
Replace purge
control solenoid
valve <Ref. to
EC(DOHC
TURBO)-7, Purge
Control Solenoid
Valve.> and ECM
<Ref. to
FU(DOHC
TURBO)-47,
Engine Control
Module.>
Engine (Diagnostics)
No
Even if MIL light
up, the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair poor
contact in ECM
connector.
Go to step 3.
Replace ECM.
<Ref. to
FU(DOHC
TURBO)-47,
Engine Control
Module.>
Go to step 5.
Go to step 6.