Subaru LEGACY 2003 Service Manual page 135

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
Step
1 CHECK OUTPUT OF STOP LIGHT SWITCH
USING SELECT MONITOR.
1) Select "Current data display & Save" on the
select monitor.
2) Release the brake pedal.
3) Read the stop light switch output in the
select monitor data display.
Is the reading indicated on monitor display
less than the specified value?
2 CHECK OUTPUT OF STOP LIGHT SWITCH
USING SELECT MONITOR.
1) Depress the brake pedal.
2) Read the stop light switch output in the
select monitor data display.
Is the reading indicated on monitor display
within the specified range?
3 CHECK IF STOP LIGHTS COME ON.
Depress the brake pedal.
Do stop lights turn on?
4 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?
5 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connector between
stop light switch and ABSCM&H/U?
6 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?
7 CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?
Value
1.5 V
10 - 15 V
Stop lights come on.
10 - 15 V
There is no poor contact.
Same DTC is not indicated.
Other DTC is not indicated.
ABS-133
ABS (DIAGNOSTICS)
Yes
Go to step 2. Go to step 3.
Go to step 5. Go to step 3.
Go to step 4. Repair stop lights
circuit.
Go to step 5. Repair harness
between stop light
switch and
ABSCM&H/U con-
nector.
Go to step 6. Repair connector.
Go to step 7. 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