Subaru Impreza 2003 Service Manual page 3271

Step
1 CHECK TRANSMISSION TYPE.
2 CHECK HARNESS BETWEEN BATTERY
AND VEHICLE SPEED SENSOR.
1)Turn the ignition switch to OFF.
2)Disconnect the harness connector from vehi-
cle speed sensor.
3)Turn the ignition switch to ON.
4)Measure the voltage between vehicle speed
sensor harness connector terminal and chas-
sis ground.
Connector & terminal
(B17) No. 3 (+) — Chassis ground ( − − − − ):
3 CHECK HARNESS BETWEEN CRUISE CON-
TROL MODULE AND VEHICLE SPEED SEN-
SOR.
1)Turn the ignition switch to OFF.
2)Disconnect the harness connector from
cruise control module.
3)Measure the resistance between vehicle
speed sensor harness connector terminal and
cruise control module harness connector ter-
minal.
Connector & terminal
(B17) No. 1 — (B94) No. 19:
4 CHECK HARNESS BETWEEN VEHICLE
SPEED SENSOR AND ENGINE GROUND.
1)Turn the ignition switch to OFF.
2)Measure the 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 the harness connector to vehicle
speed sensor.
2)Lift-up the vehicle and support with safety
stands.
3)Drive the vehicle at speed greater than 20
km/h (12 MPH).
Warning:
Be careful not to be caught up by the run-
ning wheels.
4)Measure the voltage between cruise control
module harness connector terminal and chas-
sis ground.
Connector & terminal
(B94) No. 19 (+) — Chassis ground ( − − − − ):
6 CHECK HARNESS BETWEEN CRUISE CON-
TROL MODULE AND TRANSMISSION CON-
TROL MODULE.
1)Turn the ignition switch to OFF.
2)Disconnect the harness connector from
transmission control module and cruise control
module.
3)Measure the resistance between cruise con-
trol module harness connector terminal and
transmission control module harness connec-
tor terminal.
Connector & terminal
(B94) No. 19 — (B56) No. 17:
DIAGNOSTIC PROCEDURE WITH DTC
Is the transmission type MT?
Is the voltage more than 10 V? Go to step 3.
Is the resistance less than 10
Ω?
Is the resistance less than 10
Ω?
Is the voltage less than 1V
←→ more than 5 V?
Is the resistance less than 10
Ω?
CC-27
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Check
Go to step 2.
Go to step 4.
Go to step 5.
Replace the cruise
control module.
<Ref. to CC-4,
Cruise Control
Module.>
Go to step 7.
Yes No
Go to step 6.
Check the harness
for open or short
between fuse and
vehicle speed sen-
sor.
Repair the har-
ness.
Repair the har-
ness.
Replace the vehi-
cle speed sensor.
Repair the har-
ness.