Subaru Legacy 2002 Service Manual page 2677

DIAGNOSTICS CHART WITH SELECT MONITOR
VDC (Diagnostics)
No.
1 CHECK RESISTANCE OF MOTOR RELAY.
1) Turn ignition switch to OFF.
2) Remove motor relay from relay box.
3) Measure resistance between motor relay
terminals.
Terminals
No. 85 — No. 86:
2 CHECK CONTACT POINT OF MOTOR
RELAY.
1) Connect battery to motor relay terminals
No. 85 and No. 86.
2) Measure resistance between motor relay
terminals.
Terminals
No. 30 — No. 87:
3 CHECK SHORT OF MOTOR RELAY.
Measure resistance between motor relay ter-
minals.
Terminals
No. 85 — No. 30:
No. 85 — No. 87:
4 CHECK INPUT VOLTAGE OF RELAY BOX.
1) Disconnect connector (F89) from relay box.
2) Disconnect connector from VDCCM.
3) Turn ignition switch to ON.
4) Measure voltage between relay box con-
nector and chassis ground.
Connector & terminal
(F89) No. 2 (+) — Chassis ground (−):
5 CHECK INPUT VOLTAGE OF MOTOR
RELAY.
1) Turn ignition switch to OFF.
2) Connect connector (F89) to relay box.
3) Turn ignition switch to ON.
4) Measure voltage between relay box and
chassis ground.
Connector & terminal
Motor relay installing point No. 87 (+)
— Chassis ground (−):
6 CHECK OPEN CIRCUIT IN CONTACT
POINT CIRCUIT OF RELAY BOX.
1) Turn ignition switch to OFF.
2) Disconnect connectors (VDC2, F90) from
relay box.
3) Measure resistance between relay box
connector unit and motor relay installing por-
tion.
Connector & terminal
(VDC1) No. 1 — Motor relay installing
portion No. 30:
7 CHECK OPEN CIRCUIT IN MONITOR SYS-
TEM CIRCUIT OF RELAY BOX.
Measure resistance between relay box con-
nector and motor relay installing point.
Connector & terminal
(VDC4) No. 6 — Motor relay installing
point No. 30:
Step
Is the resistance between
70 and 90 Ω?
Is the resistance less than
0.5 Ω?
Is the resistance more than
1 MΩ?
Is the voltage between 10
and 15 V?
Is the voltage between 10
and 15 V?
Is the resistance less than
0.5 Ω?
Is the resistance less than
0.5 Ω?
VDC-218
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
No
Replace motor
relay.
Replace motor
relay.
Replace motor
relay.
Repair harness/
connector
between battery
and relay box,
and check fuse
SBF holder.
Replace relay
box.
Replace relay
box.
Replace relay
box.