Subaru LEGACY 2003 Service Manual page 14

VDC
C: INSPECTION
1) Check connected and fixed condition of connector.
2) Check valve relay and motor relay for discontinuity or short circuits.
Condition
Turning off elec-
tricity.
Valve
relay
Turning on elec-
tricity between 85
and 86. (DC 12 V)
Turning off elec-
tricity.
Motor
Turning on elec-
relay
tricity between 85
and 86. (DC 12 V)
1. CHECKING THE HYDRAULIC UNIT ABS
OPERATION BY PRESSURE GAUGE
1) Lift-up vehicle and remove wheels.
2) Disconnect the air bleeder screws from the FL
and FR caliper bodies.
3) Connect two pressure gauges to the FL and FR
caliper bodies.
CAUTION:
• Pressure gauges used exclusively for brake
fluid must be used.
• Do not employ pressure gauge previously
used for transmission since the piston seal is
expanded which may lead to malfunction of the
brake.
HYDRAULIC CONTROL UNIT (H/U)
Terminal number Standard
103±10 Ω
85 — 86
Less than 0.5 Ω
30 — 87a
30 — 87 More than 1 MΩ
30 — 87a More than 1 MΩ
Less than 0.5 Ω
30 — 87
80±10 Ω
85 — 86
30 — 87 More than 1 MΩ
Less than 0.5 Ω
30 — 87
Diagram
87
87a
85
86
30
VDC00082
87
85
86
30
NOTE:
Wrap sealing tape around the pressure gauge.
4) Bleed air from the pressure gauges.
5) Perform ABS sequence control.
<Ref. to VDC-16, ABS Sequence Control.>
6) When the hydraulic unit begins to work, and first
the FL side performs decompression, holding, and
compression, and then the FR side performs de-
compression, holding, and compression.
VDC-12
Terminal location
87
86 85
87a
30
85
87
30
86
VDC00084
VDC00083
VDC00085
ABS00134