Subaru Legacy 2002 Service Manual page 2607

DIAGNOSTICS CHART WITH SELECT MONITOR
VDC (Diagnostics)
No.
17 CHECK HARNESS/CONNECTOR
BETWEEN VDCCM AND ABS SENSOR.
1) Connect connector to ABS sensor.
2) Disconnect connector from VDCCM.
3) Measure resistance at VDCCM connector
terminals.
Connector & terminal
DTC 22 / (F87) No. 14 — No. 15:
DTC 24 / (F87) No. 49 — No. 19:
DTC 26 / (F87) No. 18 — No. 46:
DTC 28 / (F87) No. 16 — No. 17:
18 CHECK GROUND SHORT OF HARNESS.
Measure resistance between VDCCM connec-
tor and chassis ground.
Connector & terminal
DTC 22 / (F87) No. 14 — Chassis
ground:
DTC 24 / (F87) No. 49 — Chassis
ground:
DTC 26 / (F87) No. 18 — Chassis
ground:
DTC 28 / (F87) No. 16 — Chassis
ground:
19 CHECK GROUND CIRCUIT OF VDCCM.
Measure resistance between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 1 — Chassis ground:
(F87) No. 55 — Chassis ground:
20 CHECK POOR CONTACT IN CONNEC-
TORS.
21 CHECK SOURCES OF SIGNAL NOISE.
22 CHECK SOURCES OF SIGNAL NOISE.
23 CHECK SHIELD CIRCUIT.
1) Connect all connectors.
2) Measure resistance between shield con-
nector and chassis ground.
Connector & terminal
DTC 22 / (B62) No. A5 — Chassis
ground:
DTC 24 / (B62) No. A6 — Chassis
ground:
NOTE:
For the DTC 26 and 28, Go to step 25.
24 CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.
Step
Is the resistance between
1.0 and 1.5 kΩ?
Is the resistance more than
1 MΩ?
Is the resistance less than
0.5 Ω?
Is there poor contact in
connectors between
VDCCM and ABS sensor?
Is the car telephone or the
wireless transmitter prop-
erly installed?
Are noise sources (such as
an antenna) installed near
the sensor harness?
Is the resistance less than
0.5 Ω?
Is the same diagnostic
trouble code as in the cur-
rent diagnosis still being
output?
VDC-148
Check Yes
Go to step 18.
Go to step 19.
Go to step 20.
Repair connector.
Go to step 22.
Install the noise
sources apart
from the sensor
harness.
Go to step 24.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
No
Repair harness/
connector
between VDCCM
and ABS sensor.
Repair harness/
connector
between VDCCM
and ABS sensor.
Repair VDCCM
ground harness.
Go to step 21.
Properly install
the car telephone
or the wireless
transmitter.
Go to step 23.
Repair shield har-
ness.
Go to step 25.