Subaru LEGACY 2003 Service Manual page 189

DIAGNOSTICS CHART WITH SELECT MONITOR
Step
1 CHECK HARNESS BETWEEN VDCCM,
STEERING ANGLE SENSOR AND TCM.
1) Turn ignition switch OFF.
2) Disconnect connector from VDCCM, TCM
and steering angle sensor.
3) Measure resistance between VDCCM,
TCM and steering angle sensor.
Connector & terminal
(F87) No. 83 — (B56) No. 9:
(F87) No. 81 — (B56) No. 18:
(F87) No. 83 — (B231) No. 2:
(F87) No. 81 — (B231) No. 1:
Is the measured value less than the speci-
fied value?
2 CHECK HARNESS BETWEEN STEERING
ANGLE SENSOR AND TCM.
Measure resistance between TCM and steer-
ing angle sensor.
Connector & terminal
(B56) No. 9 — (B231) No. 2:
(B56) No. 18 — (B231) No. 1:
Is the measured value less than the specified
value?
3 CHECK GROUND SHORT OF HARNESS.
Measure resistance between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 83 — Chassis ground:
(F87) No. 81 — Chassis ground:
Does the measured value exceed the specified
value?
4 CHECK BATTERY SHORT OF SENSOR.
Measure voltage between VDCCM and chas-
sis ground.
Connector & terminal
(F87) No. 83 — Chassis ground:
(F87) No. 81 — Chassis ground:
Is the measured value less than the specified
value?
5 CHECK BATTERY SHORT OF SENSOR.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 83 — Chassis ground:
(F87) No. 81 — Chassis ground:
Is the measured value less than the speci-
fied value?
6 CHECK STEERING ANGLE SENSOR.
1) Turn ignition switch to OFF.
2) Connect connector to steering angle sen-
sor.
3) Measure resistance between VDCCM con-
nector terminals.
Connector & terminal
(F87) No. 83 — No. 81:
Is the measured value within the specified
range?
Value
0.5 Ω
0.5 Ω
1 MΩ
0.5 V
0.5 V
114 — 126 Ω
VDC-187
VDC (DIAGNOSTICS)
Yes
Go to step 3. Go to step 2.
Repair or replace Repair or replace
harness connec- harness connec-
tor between tor between TCM
VDCCM and and steering angle
steering angle sensor.
sensor.
Go to step 4. Repair or replace
harness connec-
tor between
VDCCM, TCM and
steering angle
sensor.
Go to step 5. Repair or replace
harness connec-
tor between
VDCCM, TCM and
steering angle
sensor.
Go to step 6. Repair or replace
harness connec-
tor between
VDCCM, TCM and
steering angle
sensor.
Go to step 8. Go to step 7.
No