Subaru Legacy 2004 Service Manual page 3142

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK GENERATOR.
1) Start the engine.
2) Run the engine at idle after warming up.
3) Measure the voltage between generator B
terminal and chassis ground.
Terminals
Generator B terminal (+) — Chassis
#
ground ( ):
2 CHECK BATTERY TERMINAL.
Turn the ignition switch to OFF.
3 CHECK INPUT VOLTAGE FOR VDCCM&H/
U.
1) Disconnect the connector from VDCCM&H/
U.
2) Run the engine at idle.
3) Operate the devices such as headlights, air
conditioner, defogger, etc. which produce
much electrical loading.
4) Measure the voltage between VDCCM&H/
U connector and chassis ground.
Connector & terminal
(B310) No. 14 (+) — Chassis ground (
4 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:
5 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
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.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the voltage 10 — 15 V?
Are the positive and negative
battery terminals clamped
tightly?
Is the voltage 10 — 15 V?
#
):
Is the resistance less than 0.5
&?
nector between generator, bat-
tery and VDCCM&H/U?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-69
Yes
Go to step 2. Repair the genera-
tor. <Ref. to
SC(H4SO 2.0)-14,
Generator.>
Go to step 3. Tighten the termi-
nal.
Go to step 4. Repair the power
supply circuit.
Go to step 5. Repair the
VDCCM&H/U
ground harness.
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
VDC(diag)-37, List
of Diagnostic Trou-
ble Code (DTC).>
No