Subaru Impreza 2003 Service Manual page 599

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
2 CHECK DTC P0720 ON DISPLAY.
3 CHECK SPEEDOMETER OPERATION IN
COMBINATION METER.
4 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
(B137) No. 10 — (i11) 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(H4SO)-187
ENGINE (DIAGNOSTICS)
Yes
Check front vehi- Go to step 3.
cle speed sensor
signal circuit.
<Ref. to 4AT-53,
DTC 33 FRONT
VEHICLE SPEED
SENSOR, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Go to step 4. Check speedome-
ter and vehicle
speed sensor.
<Ref. to IDI-18,
Speedometer.>
and <Ref. to 4AT-
52, Front Vehicle
Speed Sensor.>
and <Ref. to 4AT-
56, Rear Vehicle
Speed Sensor.>
and <Ref. to 4AT-
57, Torque Con-
verter Turbine
Speed Sensor.>
Repair poor con- Repair harness
tact in ECM con- and connector.
nector.
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
No