Subaru Legacy 2002 Service Manual page 2965

Instrumentation/Driver Info
3. CHECK VEHICLE SPEED SENSOR
S907607A1002
No.
1 CHECK VEHICLE SPEED SENSOR.
1) Lift-up the vehicle and support it with safety
stands.
2) Remove the combination meter with har-
ness connector.
WARNING:
Be careful not to get caught in the running
wheels.
3) Drive the vehicle at a speed greater than
20 km/h (12 MPH).
4) Measure voltage between combination
meter connector and chassis ground.
Connector & terminal
(i10) No. 13 (+) — Chassis ground (−):
2 CHECK VEHICLE SPEED SENSOR POWER
SUPPLY.
1) Turn ignition switch to OFF.
2) Disconnect vehicle speed sensor harness
connector.
3) Turn ignition switch to ON.
4) Measure voltage between vehicle speed
sensor connector and engine ground.
Connector & terminal
(B17) No. 3 (+) — Engine ground (−):
3 CHECK HARNESS BETWEEN VEHICLE
SPEED SENSOR AND ENGINE GROUND.
1) Turn ignition switch to OFF.
2) Measure resistance between vehicle speed
sensor connector and engine ground.
Connector & terminal
(B17) No. 2 (+) — Engine ground (−):
4 CHECK HARNESS BETWEEN VEHICLE
SPEED SENSOR AND COMBINATION
METER.
1) Disconnect connector from combination
meter.
2) Measure resistance between vehicle speed
sensor harness connector and combination
meter harness connector.
Connector & terminal
(B17) No. 1 — (i10) No. 13:
COMBINATION METER SYSTEM
Step
Is the voltage less than
1 V←→ more than 4 V?
Is the voltage more than
10 V?
Is the resistance less than
10 Ω?
Is the resistance less than
10 Ω?
Check
IDI-8
Yes
Check speedom- Go to step 2.
eter. <Ref. to IDI-
19, REMOVAL,
Speedometer.>
Go to step 3. Check harness for
open or short
between ignition
relay and vehicle
speed sensor.
Go to step 4. Repair wiring har-
ness.
Replace vehicle Repair wiring har-
speed sensor. ness.
No