Subaru 2004 LEGACY, Service Manual

Page: 291 / 609

ABS(diag)-75
ABS (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK OUTPUT OF STOP LIGHT SWITCH
USING SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Release the brake pedal.
3) Read the stop light switch signal in Subaru
Select Monitor. Is “OFF” displayed on the dis-
play? Go to step 2. Go to step 3.
2 CHECK OUTPUT OF STOP LIGHT SWITCH
USING SUBARU SELECT MONITOR.
1) Depress the brake pedal.
2) Read the stop light switch output in Subaru
Select Monitor. Is “ON” displayed on the dis-
play? Go to step 5. Go to step 3.
3 CHECK IF STOP LIGHTS COME ON.
Depress the brake pedal. Does the stop light illuminate? Go to step 4. Repair the stop
lights circuit.
4 CHECK OPEN CIRCUIT IN HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ABSCM&H/
U.
3) Depress the brake pedal.
4) Measure the voltage between ABSCM&H/
U connector and chassis ground.
Connector & terminal
(B301) No. 20 (+) — Chassis ground (
−
):
Is the voltage 10 — 15 V? Go to step 5. Repair harness
between stop light
switch and
ABSCM&H/U con-
nector.
5 CHECK POOR CONTACT IN CONNECTOR. Is there poor contact in con-
nector between stop light
switch and ABSCM&H/U?
Go to step 6. Repair the con-
nector.
6 CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC. Is the same DTC displayed? Replace the
ABSCM only.
<Ref. to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).> Go to step 7.
7 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect the DTC
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
ABS(diag)-39, List
of Diagnostic Trou-
ble Code (DTC).> Temporary poor
contact occurs.