Subaru Forester 2004 Service Manual page 157

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTIC)
Step
1 CHECK OUTPUT OF STOP LIGHT SWITCH
USING SUBARU SELECT MONITOR.
1) Select "Current data display & Save" on the
SUBARU select monitor.
2) Release the brake pedal.
3) Read the stop light switch output in select
monitor data display.
2 CHECK OUTPUT OF STOP LIGHT SWITCH
USING SELECT MONITOR.
1) Depress the brake pedal.
2) Read the stop light switch output in SUB-
ARU select monitor data display.
3 CHECK IF STOP LIGHTS COME ON.
Depress the brake pedal.
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
LHD: (B301) No. 2 (+) — Chassis ground
−
( ):
RHD: (F49) No. 2 (+) — Chassis ground
−
( ):
5 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
6 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read out the DTC.
7 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
Check
Is the reading indicated on
monitor display less than 1.5
V?
Is the reading indicated on
monitor display 10 — 15 V?
Do the stop lights turn on?
Is the voltage 10 — 15 V?
nector between stop light
switch and ABSCM&H/U?
Is the same DTC as in current
diagnosis still being output?
Are other DTCs being output? Proceed with the
ABS-156
Yes
Go to step 2. Go to step 3.
Go to step 5. Go to step 3.
Go to step 4. Repair the stop
lights circuit.
Go to step 5. Repair the har-
ness between stop
light switch and
ABSCM&H/U con-
nector.
Repair the con- Go to step 6.
nector.
Replace the Go to step 7.
ABSCM only.
<Ref. to ABS-8,
ABSCM (ABS
CONTROL MOD-
ULE), REPLACE,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor
diagnosis corre- contact.
sponding to DTC.
No