Subaru Legacy 2003 Service Manual page 2868

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK WHEELS FOR FREE TURNING.
Have the wheels been turned freely such as
when the vehicle is lifted up, or operated on a
rolling road?
2 CHECK SPECIFICATIONS OF ABSCM&H/U.
Check specifications of the mark to the
ABSCM&H/U.
CG: AT (Except OUTBACK)
CH: MT (Except OUTBACK)
CI: AT (OUTBACK)
CJ: MT (OUTBACK)
Does the vehicle specification and the
ABSCM&H/U specification match?
3 CHECK INPUT VOLTAGE OF G SENSOR.
1) Turn ignition switch to OFF.
2) Remove console box.
3) Disconnect G sensor from body. (Do not
disconnect connector.)
4) Turn ignition switch to ON.
5) Measure voltage between G sensor con-
nector terminals.
Connector & terminal
(R70) No. 1 (+) — No. 3 ( − − − − ):
Is the measured value within the specified
range?
4 CHECK OPEN CIRCUIT IN G SENSOR OUT-
PUT HARNESS AND GROUND HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Measure resistance between ABSCM&H/U
connector terminals.
Connector & terminal
(F49) No. 6 — No. 28:
Is the measured value within the specified
range?
5 CHECK GROUND SHORT IN G SENSOR
OUTPUT HARNESS.
1) Disconnect connector from G sensor.
2) Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 6 — Chassis ground:
Does the measured value exceed the spec-
ified value?
6 CHECK BATTERY SHORT OF HARNESS.
Measure voltage between ABSCM&H/U con-
nector and chassis ground.
Connector & terminal
(F49) No. 6 (+) — Chassis ground ( − − − − ):
Is the measured value less than the specified
value?
Value
Wheels have not turned freely. Go to step 2.
Both are the same specifica-
tions.
4.75 - 5.25 V
5.0 - 5.6 kΩ
1 MΩ
1 V
ABS-77
ABS (DIAGNOSTICS)
Yes
The ABS is nor-
mal. Erase the
DTC.
Go to step 3. Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
CAUTION:
Be sure to turn ig-
nition switch to
OFF when remov-
ing ABSCM&H/U.
Go to step 4. Repair harness/
connector
between G sensor
and ABSCM&H/U.
Go to step 5. Repair harness/
connector
between G sensor
and ABSCM&H/U.
Go to step 6. Repair harness
between G sensor
and ABSCM&H/U.
Go to step 7. Repair harness
between G sensor
and ABSCM&H/U.
No