Subaru Legacy 2004 Service Manual page 3157

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
1 CHECK INPUT VOLTAGE FOR VDCCM&H/
U.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from VDCCM&H/
U.
3) Turn the ignition switch to ON.
4) Measure the voltage between VDCCM&H/
U connector and chassis ground.
Connector & terminal
(B310) No. 9 (+) — Chassis ground (
(B310) No. 14 (+) — Chassis ground (
2 CHECK GROUND CIRCUIT FOR VDCCM&H/
U.
1) Turn the ignition switch to OFF.
2) Measure the resistance between
VDCCM&H/U connector and chassis ground.
Connector & terminal
(B310) No. 6 — Chassis ground:
(B310) No. 10 — Chassis ground:
3 CHECK MOTOR RELAY FOR VDCCM&H/U.
Measure the resistance between VDCCM&H/U
connector terminals.
Terminals
No. 9 — No. 10:
4 CHECK MOTOR OPERATION.
Operate the sequence control.
5 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
6 CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
7 CHECK OTHER DTC DETECTION.
Check
Is the voltage 10 — 15 V?
#
):
#
):
Is the resistance less than 0.5
&?
Is the resistance more than 1
M&?
Is the motor revolution noise
(buzz) heard when carrying out
the sequence control?
Is there poor contact in con-
nector between generator, bat-
tery and VDCCM&H/U?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-84
Yes
Go to step 2. Repair the power
supply circuit in
VDCCM&H/U.
Go to step 3. Repair the
VDCCM&H/U
ground harness.
Go to step 4. Replace the
VDCCM&H/U.
Go to step 5. Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Repair the con- Go to step 6.
nector.
Replace the Go to step 7.
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC. <Ref. to
NOTE:
VDC(diag)-37, List
Though the ABS
of Diagnostic Trou-
warning light re-
ble Code (DTC).>
mains on at this
time, it is normal.
Drive the vehicle at
more than 12 km/h
(7 MPH) in order to
turn ABS warning
light off. Be sure to
drive the vehicle
and check
warning light goes
off.
No
the