Subaru FORESTER 2001 Service Manual page 240

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK THROTTLE CABLE.
2 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 10 (+) — Chassis ground
(−):
3 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from idle air control
solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 10 (+) — Chassis ground
(−):
4 CHECK OUTPUT SIGNAL FROM ECM.
Measure voltage between ECM and chassis
ground.
Connector & terminal
(B136) No. 10 (+) — Chassis ground
(−):
Step
Does throttle cable have
play for adjustment?
Is the voltage more than 10
V?
Is the voltage more than 10
V?
Does the voltage change
more than 10 V by shaking
harness and connector of
ECM while monitoring the
value with voltage meter?
EN(DOHC TURBO)-239
Check Yes
Go to step 2.
Go to step 3.
Repair battery
short circuit in
harness between
ECM and idle air
control solenoid
valve connector.
After repair,
replace ECM.
<Ref. to
FU(DOHC
TURBO)-47,
Engine Control
Module.>
Repair battery
short circuit in
harness between
ECM and idle air
control solenoid
valve connector.
After repair,
replace ECM.
<Ref. to
FU(DOHC
TURBO)-47,
Engine Control
Module.>
Engine (Diagnostics)
No
Adjust throttle
cable. <Ref. to
SP-12,
INSTALLATION,
Accelerator Con-
trol Cable.>
Go to step 4.
Replace idle air
control solenoid
valve <Ref. to
FU(DOHC
TURBO)-36, Idle
Air Control Sole-
noid Valve.> and
ECM <Ref. to
FU(DOHC
TURBO)-47,
Engine Control
Module.>.
Contact your
Subaru distributor.
NOTE:
Inspection by
DTM is required,
because probable
cause is deterio-
ration of multiple
parts.