Subaru Legacy 2002 Service Manual page 2378

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
No.
1 CHECK ALL FOUR WHEELS FOR FREE
TURNING.
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)
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 (−):
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:
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:
6 CHECK BATTERY SHORT OF HARNESS.
Measure voltage between ABSCM&H/U con-
nector and chassis ground.
Connector & terminal
(F49) No. 6 (+) — Chassis ground (−):
7 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 6 (+) — Chassis ground (−):
Step
Have the wheels been
turned freely such as when
the vehicle is lifted up, or
operated on a rolling road?
Does the vehicle specifica-
tion and the ABSCM&H/U
specification match?
Is the voltage between 4.75
and 5.25 V?
Is the resistance between
4.3 and 4.9 kΩ?
Is the resistance more than
1 MΩ?
Is the voltage less than 1
V?
Is the voltage less than 1
V?
ABS-77
Check Yes
The ABS is nor-
mal. Erase the
DTC.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
CAUTION:
Be sure to turn
ignition switch
to OFF when
removing
ABSCM&H/U.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
ABS (Diagnostics)
No
Go to step 2.
Go to step 3.
Repair harness/
connector
between G sensor
and ABSCM&H/U.
Repair harness/
connector
between G sensor
and ABSCM&H/U.
Repair harness
between G sensor
and ABSCM&H/U.
Repair harness
between G sensor
and ABSCM&H/U.
Repair harness
between G sensor
and ABSCM&H/U.