Subaru Legacy 2003 Service Manual page 2862

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Run the engine at idle.
4) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 1 (+) — Chassis ground ( − − − − ):
(F49) No. 24 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
2 CHECK GROUND CIRCUIT OF ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 23 — Chassis ground:
Is the measured value less than the speci-
fied value?
3 CHECK VALVE RELAY IN ABSCM&H/U.
Measure resistance between ABSCM&H/U
and terminals.
Terminals
No. 23 — No. 24 :
Does the measured value exceed the specified
value?
4 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
generator, battery and ABSCM&H/U?
5 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.
Is the same DTC still being output?
6 CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?
Value
10 - 15 V
0.5 Ω
1 MΩ
There is no poor contact.
Same DTC is not indicated.
Other DTC is not indicated.
ABS-71
ABS (DIAGNOSTICS)
Yes
Go to step 2. Repair harness
connector
between battery
and ABSCM&H/U.
Go to step 3. Repair
ABSCM&H/U
ground harness.
Go to step 4. Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 5. Repair connector.
Go to step 6. Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor Proceed with the
contact. diagnosis corre-
sponding to the
DTC.
No