Subaru Legacy 2002 Service Manual page 1456

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK DTC P0720 ON DISPLAY.
2 CHECK SPEEDOMETER OPERATION IN
COMBINATION METER.
3 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from combination
meter.
3) Measure resistance between ECM and
combination meter.
Connector & terminal
(B134) No. 1 — (i10) No. 11:
Step
Does the Subaru Select
Monitor or OBD-II general
scan tool indicate DTC
P0720?
Does speedometer operate
normally?
Is the resistance less than
10 Ω?
EN(H6)-249
Check Yes
Check front
vehicle speed
sensor signal cir-
cuit. <Ref. to
AT-52, DTC 33
FRONT VEHICLE
SPEED SENSOR,
Diagnostic Proce-
dure with Diag-
nostic Trouble
Code (DTC).>
Go to step 3.
Repair poor con-
tact in ECM con-
nector.
Engine (DIAGNOSTICS)
No
Go to step 2.
Check speedom-
eter and vehicle
speed sensor.
<Ref. to IDI-19,
Speedometer.>,
<Ref. to AT-33,
Front Vehicle
Speed Sensor.>
and <Ref. to
AT-37, Rear
Vehicle Speed
Sensor.>
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and combi-
nation meter con-
nector
¼ Poor contact in
ECM connector
¼ Poor contact in
combination meter
connector
¼ Poor contact in
coupling connec-
tor