Subaru Legacy 2002 Service Manual page 2514

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
No.
5 CHECK BATTERY SHORT OF HARNESS.
Measure voltage between VDCCM connector
and chassis ground.
Connector & terminal
DTC 21 / (F87) No. 14 (+) — Chassis
ground (−):
DTC 23 / (F87) No. 49 (+) — Chassis
ground (−):
DTC 25 / (F87) No. 18 (+) — Chassis
ground (−):
DTC 27 / (F87) No. 16 (+) — Chassis
ground (−):
6 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
DTC 21 / (F87) No. 14 (+) — Chassis
ground (−):
DTC 23 / (F87) No. 49 (+) — Chassis
ground (−):
DTC 25 / (F87) No. 18 (+) — Chassis
ground (−):
DTC 27 / (F87) No. 16 (+) — Chassis
ground (−):
7 CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
32±10 N·m (3.3±1.0 kgf-m, 24±7 ft-lb)
8 CHECK ABS SENSOR GAP.
Measure tone wheel-to-pole piece gap over
entire perimeter of the wheel.
Specifications
Front wheel
0.3 — 0.8 mm (0.012 — 0.031 in)
Rear wheel
0.44 — 0.94 mm (0.0173 — 0.0370 in)
9 CHECK HUB AND TONE WHEEL RUNOUT.
Measure hub and tone wheel runout.
10 CHECK POOR CONTACT IN CONNEC-
TORS.
11 CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.
Step
Is the voltage less than 1
V?
Is the voltage less than 1
V?
Are the ABS sensor instal-
lation bolts tightened
securely?
Is the gap within the speci-
fications?
Is the runout less than 0.05
mm (0.0020 in)?
Is there poor contact in
connectors between
VDCCM and ABS sensor?
Is the same diagnostic
trouble code as in the cur-
rent diagnosis still being
output?
VDC-55
Check Yes
Go to step 6.
Go to step 7.
Go to step 8.
Go to step 9.
Go to step 10.
Repair connector.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
VDC (Diagnostics)
No
Repair harness
between VDCCM
and ABS sensor.
Repair harness
between VDCCM
and ABS sensor.
Tighten ABS sen-
sor installation
bolts securely.
Adjust the gap.
NOTE:
Adjust the gap
using spacers
(Part No.
26755AA000). If
spacers cannot
correct the gap,
replace worn sen-
sor or worn tone
wheel.
Repair hub and
tone wheel. Front
<Ref. to VDC-30,
Front Tone
Wheel.> Rear
<Ref. to VDC-31,
Rear Tone
Wheel.>
Go to step 11.
Go to step 12.