Subaru Impreza 2003 Service Manual page 2428

DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step
2 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
( − − − − ):
3 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
4 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
5 CHECK ANY OTHER DTC APPEARANCE.
Check
Is the voltage 10 — 15 V?
nector between stop light
switch and ABSCM&H/U?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
ABS-88
Yes
Go to step 3. Repair the har-
ness between stop
light switch and
ABSCM&H/U.
Repair the con- Go to step 4.
nector.
Replace the Go to step 5.
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor
diagnosis corre- contact.
sponding to DTC.
No