Subaru 2002 IMPREZA Service Manual page 471

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Yes
Check front vehi-
cle speed sensor
signal circuit. <Ref.
FRONT VEHICLE
SPEED SENSOR,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
Go to step 4.
to AT-57, DTC 33
Repair poor con-
tact in ECM con-
nector.
No
Go to step
3 .
Check speedome-
ter and vehicle
speed sensor.
<Ref. to IDI-13,
Speedometer.>
and <Ref. to AT-32,
Front Vehicle
Speed Sensor.>
Repair harness
and connector.
NOTE:
In this case, repai
the following:
Open circuit in
harness between
ECM and combi-
nation meter con-
nector
Poor contact in
ECM connector
Poor contact in
combination meter
connector
Poor contact in
coupling connect0
Step
CHECK DTC PO720 ON DISPLAY.
1
CHECK SPEEDOMETER OPERATION IN
COMBINATION METER.
I
CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
EN(D0HC TURBO)-247
Check
Does the Subaru Select Moni-
tor or OBD-ll general scan tool
indicate DTC P0720?
Does speedometer operate
normally?
Is
the resistance less than 10
Q?