Subaru Legacy 2002 Service Manual page 1464

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(H6)-257
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(H6)-
47, Engine Con-
trol Module.>
Repair battery
short circuit in
harness between
ECM and idle air
control solenoid
valve connector.
After repair,
replace ECM.
<Ref. to FU(H6)-
47, Engine Con-
trol Module.>
Engine (DIAGNOSTICS)
No
Adjust throttle
cable. <Ref. to
SP(H6)-9, Accel-
erator Control
Cable.>
Go to step 4.
Replace idle air
control solenoid
valve <Ref. to
FU(H6)-36, Idle
Air Control Sole-
noid Valve.> and
ECM <Ref. to
FU(H6)-47,
Engine Control
Module.>.
Contact with your
Subaru distributor
service.
NOTE:
Inspection by
DTM is required,
because probable
cause is deterio-
ration of multiple
parts.