Subaru Impreza 2002 Service Manual page 2781

ABS (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
1. WITHOUT SUBARU SELECT MONITOR
CAUTION:
Remove foreign matter (dust, water, etc.) from the ABSCM&H/U connector during removal and instal-
lation.
NOTE:
• To check the harness for broken wires or short circuits, shake it while holding it or the connector.
• When the ABS warning light illuminates, read and record the diagnostic trouble code (DTC) indicated by
ABS warning light.
Step
1 CHECK PRE-INSPECTION.
1)Ask the customer when and how trouble
occurred using interview checklist. <Ref. to
ABS-6, Check List for Interview.>
2)Before performing diagnosis, inspect the unit
which might influence ABS problem. <Ref. to
ABS-9, INSPECTION, General Description.>
2 CHECK INDICATION OF DIAGNOSTIC
TROUBLE CODE (DTC).
Calling up the DTC. <Ref. to ABS-20, Read
Diagnostic Trouble Code (DTC).>
3 CHECK DIAGNOSTIC TROUBLE CODE
(DTC).
NOTE:
Record all DTCs.
4 PERFORM THE GENERAL DIAGNOSTICS.
1)Inspect using "General Diagnostics Table".
<Ref. to ABS-179, General Diagnostics
Table.>
2)Perform the clear memory mode. <Ref. to
ABS-22, WITHOUT SUBARU SELECT MONI-
TOR, OPERATION, Clear Memory Mode.>
3)Perform the inspection mode. <Ref. to ABS-
21, Inspection Mode.>
Calling up the DTC. <Ref. to ABS-20, Read
Diagnostic Trouble Code (DTC).>
BASIC DIAGNOSTIC PROCEDURE
Is the unit that might influence
the ABS problem normal?
Is any DTC readable?
Is only the start code issued?
Is only the start code issued?
ABS-2
Check
Go to step 2.
Go to step 3.
Go to step 4.
Complete the
diagnosis.
Yes No
Repair or replace
each unit.
Inspect using diag-
nostic chart for
ABS warning light
failure.<Ref. to
ABS-28, Diagnos-
tics Chart with
Diagnosis Con-
nector.>
NOTE:
Call up DTC again
after inspecting
ABS warning light.
<Ref. to ABS-20,
Read Diagnostic
Trouble Code
(DTC).>
Go to step 5.
Go to step 5.