Subaru Legacy 2003 Service Manual page 2866

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK STOP LIGHTS COME ON.
Depress the brake pedal.
Do stop lights come on?
2 CHECK OPEN CIRCUIT IN HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Depress brake pedal.
4) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 2 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
3 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connector between
stop light switch and ABSCM&H/U?
4 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?
5 CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?
Value
Stop lights come on.
10 - 15 V
There is no poor contact.
Same DTC is not indicated.
Other DTC is not indicated.
ABS-75
ABS (DIAGNOSTICS)
Yes
Go to step 2. Repair stop lights
circuit.
Go to step 3. Repair harness
between stop light
switch and
ABSCM&H/U.
Go to step 4. Repair connector.
Go to step 5. 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