Subaru Legacy 2002 Service Manual page 2591

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
VDC (Diagnostics)
No.
8 CHECK BATTERY SHORT OF HARNESS.
Measure voltage between VDCH/U connector
and chassis ground.
Connector & terminal
(F91) No. 13 (+) — Chassis ground (−):
(F91) No. 14 (+) — Chassis ground (−):
9 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCH/U con-
nector and chassis ground.
Connector & terminal
(F91) No. 13 (+) — Chassis ground (−):
(F91) No. 14 (+) — Chassis ground (−):
10 CHECK OUTPUT VOLTAGE OF PRESSURE
SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Remove cover from VDCCM. <Ref. to
VDC-17, REMOVE, VDCCM Connector
Cover.>
4) Connect connector to VDCCM.
5) Connect all connectors.
6) Turn ignition switch to ON.
7) Do not depress brake pedal.
8) Measure voltage between VDCCM connec-
tor terminals.
Connector & terminal
(F87) No. 77 (+) — No. 76 (−):
(F87) No. 36 (+) — No. 76 (−):
11 CHECK BRAKE FLUID LEAKAGE.
Inspect fluid leakage between brake master
cylinder and VDCH/U.
12 CHECK BRAKE MASTER CYLINDER.
Inspect brake master cylinder hydraulic pres-
sure. <Ref. to BR-38, OPERATION CHECK
(WITH GAUGES), INSPECTION, Brake
Booster.>
13 CHECK BRAKE PEDAL STROKE.
Measure the stroke between non-forced pedal
position and forced pedal position with 50 kg
(110 lb).
14 CHECK INPUT VOLTAGE OF PRESSURE
SENSOR.
1) Depress the brake pedal with 50 kg (110
lb).
2) Measure voltage between VDCCM connec-
tor terminals.
Connector & terminal
A (F87) No. 77 (+) — No. 76 (−):
B (F87) No. 36 (+) — No. 76 (−):
15 CHECK POOR CONTACT IN CONNEC-
TORS.
16 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 0.5
V?
Is the voltage less than 0.5
V?
Is the voltage between 0.48
and 0.72 V?
Does brake fluid leak?
Is hydraulic pressure nor-
mal?
Is the stroke less than 95
mm (3.74 in)?
Is the voltage between A
and B more than 0.2 V?
Is there poor contact in
connector between
VDCCM and pressure sen-
sor?
Is the same diagnostic
trouble code as in the cur-
rent diagnosis still being
output?
VDC-132
Check Yes
Go to step 9.
Go to step 10.
Go to step 11.
Retighten or
replace.
Go to step 13.
Go to step 14.
Go to step 15.
Repair connector.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
No
Repair harness
between VDCH/U
and VDCCM.
Repair harness
between VDCH/U
and VDCCM.
Replace VDCH/U.
<Ref. to VDC-11,
Hydraulic Control
Unit (H/U).>
Go to step 12.
Replace master
cylinder.
Perform bleeding.
Replace VDCH/U.
<Ref. to VDC-11,
Hydraulic Control
Unit (H/U).>
Go to step 16.
Go to step 17.