Subaru Legacy 2002 Service Manual page 3337

DIAGNOSTICS CHART WITH TROUBLE CODE
Cruise Control System (Diagnostics)
No.
1 CHECK TRANSMISSION TYPE.
2 CHECK HARNESS BETWEEN BATTERY
AND VEHICLE SPEED SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect harness connector from vehicle
speed sensor.
3) Turn ignition switch to ON.
4) Measure voltage between vehicle speed
sensor harness connector terminal and chas-
sis ground.
Connector & terminal
(B17) No. 3 (+) — Chassis ground (−):
3 CHECK HARNESS BETWEEN CRUISE
CONTROL MODULE AND VEHICLE SPEED
SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect harness connector from cruise
control module.
3) Measure resistance between vehicle speed
sensor harness connector terminal and cruise
control module harness connector terminal.
Connector & terminal
(B17) No. 1 — (B94) No. 19:
4 CHECK HARNESS BETWEEN VEHICLE
SPEED SENSOR AND ENGINE GROUND.
Measure resistance between vehicle speed
sensor harness connector terminal and
engine ground.
Connector & terminal
(B17) No. 2 (+) — Engine ground (−):
5 CHECK VEHICLE SPEED SENSOR.
1) Connect harness connector to vehicle
speed sensor.
2) Lift-up the vehicle and support with safety
stands.
WARNING:
Be careful not to be caught up by the run-
ning wheels.
3) Drive the vehicle at speed greater than 20
km/h (12 MPH).
4) Measure voltage between cruise control
module harness connector terminal and chas-
sis ground.
Connector & terminal
(B94) No. 19 (+) — Chassis ground (−):
Step
Is the transmission type
MT?
Is the voltage more than 10
V?
Is the resistance less than
10 Ω?
Is the resistance less than
10 Ω?
Is the voltage less than 1 V
←→ more than 4 V?
CC-30
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Replace cruise
control module.
<Ref. to CC-6,
Cruise Control
Module.>
No
Go to step 6.
Check harness for
open or short
between ignition
relay and vehicle
speed sensor.
Repair harness.
Repair harness.
Replace vehicle
speed sensor.