Subaru XT 1988 Service Manual page 371

2-7
FUEL INJECTION SYSTEM
TROUBLE CODE (33): SPEED SENSOR
Control unit
29 VR
@(Black)
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*@(Black)
**
®
Combination
meter
Fig. 93
*. 1800 cc model
Check if trouble code is out-
putted in D·check mode.
YES
Turn ignition switch OFF
(engine off).
Disconnect test mode
connector.
Turn ignition switch ON
(engine on).
Check if voltage fluctuates
above and below 2V by slowly
moving the car while monitor·
ing voltage across speed signal
terminal 29 (YR) of control
unit and body.
NO
Check if voltage across termi·
nal 29 (YR) of control unit
connector and body is greater
than
2V.
YES
Disconnect combination meter.
Is voltage between combina-
tion meter connector car speed
YES
NO
YES
signal terminal (VR) and car 1----..4
Check terminals of control unit.
(See pege
56.)
Replace control unit.
Replace car speed
sensor.
body greater than 2V? ' - - - - - - - - -.....
NO
Repair harness.
88
Turn ignition switch OFF
(engine off).
Disconnect combination meter.
Check if resistance between
terminal
29
(VR) of control
unit connector and body is less
than
10n.
YES
Repair harness.
NO
L2·940
**:
2700 cc model
Replace car speed
sensor.
f