Subaru 2002 IMPREZA Service Manual page 697

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK DTC P0720 ON DISPLAY.
2 CHECK SPEEDOMETER OPERATION IN
COMBINATION METER.
3 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from combination
meter.
3)Measure the resistance between ECM and
combination meter.
Connector & terminal
(B135) No. 24 — (i10) No. 2:
Check
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P0720?
Does the speedometer operate
normally?
Is the resistance less than 10
Ω?
EN-265
ENGINE (DIAGNOSTICS)
Yes
Check the front Go to step 2.
vehicle speed sen-
sor signal circuit.
<Ref. to AT-57,
DTC 33 FRONT
VEHICLE SPEED
SENSOR, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Go to step 3. Check the speed-
ometer and vehi-
cle speed sensor.
<Ref. to IDI-17,
Speedometer.>
Repair the poor Repair the har-
contact in ECM ness and connec-
connector. tor.
NOTE:
In this case, repair
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 connector
(i2)
No