Subaru XT 1988 Service Manual page 366

FUEL INJECTION SYSTEM 2-7
TROUBLE CODE (24): BY-PASS AIR CONTROL VALVE
YL
YL
3
59
~P
CD ®
@
By·pass air control valve
ContrOl unit
YR YR
t--
58
1
BW
t--
2
C§])
~
TIO
BW BW
(i)
~
IG
L2·1503
Fig. 88
Check if trouble code is outputted in
NO
Check terminals of control unit.
J
D-check mode. (See page 56.)
,
YES
Turn ignition switch
OFF
(engine off).
1
Disconnect test mode connector.
j
Disconnect control unit connector.
,
Turn ignition switch
ON
(engine off).
1
Check if voltage between control
unit connector (body side) by·pass
NO
Disconnect bY'pass air control
air terminal (YR) and car body, and
bY'pass air terminal (YLl and car
valve connector.
body is greater than
10
v.
1
1
YES
Check if voltage between terminal
Repair harness from
Disconnect bY'pass air control
(BW) of control valve connector
NO
battery to control
valve connector.
(body side) and car body is greater
valve.
1 than
10
V.
1.
YES
Check if resistance between terminals
CD
and
®
of control valve is
9.5 -
NO
Replace bY'pass
Check if resistance between terminals
Replace bY'pass
...
CD
and
®
of control valve is
9.5 -
NO
11.5 .n, and between terminals
® air control
air control
and
@
is
8.5 -10.5.n.
valve.
11.5 .n
and between terminal
®
and
valve.
®
is 8.5 - 10.5.n.
1
YES
, YES
Remove by-pass air control valve
I
I
from engine, and disconnect hoses.
Repair terminals.
,
Connect control valve connector.
t
Make sure the valve moves when
NO
Replace by-pass
ignition switch is turned
ON
and
air control
OFF.
valve.
1 YES
Replace control unit.
83