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DIAGNOSTICS PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)

13.Diagnostics Procedure with Diagnostic Trouble Code (DTC)
A: COMMUNICATION FOR INITIALIZING IMPOSSIBLE
DIAGNOSIS:
Faulty harness connector
TROUBLE SYMPTOM:
ABS warning light remains on.
WIRING DIAGRAM:

BATTERY
SBF-1

GENERATOR
SBF-4

IGNITION
SWITCH
DATA LINK
CONNECTOR
4

B40
No.18

E
20

23
1

B301 ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT

B40 B301

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8
16 17 18 19 20 21 22
23 24 25 26
9 10 11 12 13 14 15 16 27 28 29 30 31

ABS00128

ABS-80
DIAGNOSTICS PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)

Step Check Yes No
1 CHECK IGNITION SWITCH. Is the ignition switch turned to Go to step 2. Turn the ignition
ON? switch to ON, and
select ABS mode
using SUBARU
select monitor.
2 CHECK BATTERY. Is the voltage more than 11 V? Go to step 3. Charge or replace
1) Turn the ignition switch to OFF. the battery.
2) Measure the battery voltage.
3 CHECK BATTERY TERMINAL. Is there poor contact at battery Repair or tighten Go to step 4.
terminal? the battery termi-
nal.
4 CHECK COMMUNICATION OF SELECT Are the name and year of sys- Go to step 7. Go to step 5.
MONITOR. tem displayed on select moni-
1) Turn the ignition switch to ON. tor?
2) Using the select monitor, check whether
communication to other system can be exe-
cuted normally.
5 CHECK COMMUNICATION OF SELECT Are the name and year of sys- Go to step 7. Go to step 6.
MONITOR. tem displayed on select moni-
1) Turn the ignition switch to OFF. tor?
2) Disconnect the ABSCM&H/U connector.
3) Turn the ignition switch to ON.
4) Check whether communication to other
systems can be executed normally.
6 CHECK HARNESS CONNECTOR BETWEEN Is the resistance more than 1 Go to step 7. Repair the har-
EACH CONTROL MODULE AND DATA LINK M? ness and connec-
CONNECTOR. tor between each
1) Turn the ignition switch to OFF. control module
2) Disconnect the ABSCM&H/U, ECM and and data link con-
TCM connectors. nector.
3) Measure the resistance between data link
connector and chassis ground.
Connector & terminal
(B40) No. 5 -- Chassis ground:
(B40) No. 4 -- Chassis ground:
7 CHECK OUTPUT SIGNAL FOR ABSCM& Is the voltage less than 1 V? Go to step 8. Repair the har-
H/U. ness and connec-
1) Turn the ignition switch to ON. tor between each
2) Measure the voltage between ABSCM&H/ control module
U and chassis ground. and data link con-
Connector & terminal nector.
(B40) No. 5 (+) -- Chassis ground (-):
(B40) No. 4 (+) -- Chassis ground (-):
8 CHECK HARNESS/CONNECTOR BETWEEN Is the resistance less than 0.5 Repair the har- Go to step 9.
ABSCM&H/U AND DATA LINK CONNEC- ? ness and connec-
TOR. tor between
Measure the resistance between ABSCM&H/U ABSCM&H/U and
connector and data link connector. data link connec-
Connector & terminal tor.
(B301) No. 20 -- (B40) No. 5:
(B301) No. 5 -- (B40) No. 4:
9 CHECK INSTALLATION OF ABSCM&H/U Is the ABSCM&H/U connector Go to step 10. Insert the
CONNECTOR. inserted into ABSCM&H/U until ABSCM&H/U con-
Turn the ignition switch to OFF. the clamp locks onto it? nector into
ABSCM&H/U.

ABS-81
DIAGNOSTICS PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)

Step Check Yes No
10 CHECK POWER SUPPLY CIRCUIT. Is the voltage more than 10 V? Go to step 11. Repair the open
1) Turn the ignition switch to ON (engine circuit in harness
OFF). between
2) Measure the ignition power supply voltage ABSCM&H/U and
between ABSCM&H/U connector and chassis battery.
ground.
Connector & terminal
(B301) No. 1 (+) -- Chassis ground (-):
11 CHECK HARNESS CONNECTOR BETWEEN Is the resistance less than 1 Go to step 12. Repair the open
ABSCM&H/U AND CHASSIS GROUND. ? circuit in harness
1) Turn the ignition switch to OFF. between
2) Disconnect the connector from ABSCM&H/ ABSCM&H/U and
U and transmission. inhibitor side con-
3) Measure the resistance of harness nector, and poor
between ABSCM&H/U and chassis ground. contact in cou-
Connector & terminal pling connector.
(B301) No. 23 -- Chassis ground:
12 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in control Repair the con- Replace the
module power supply, ground nector. ABSCM&H/U.
line and data link connector?

ABS-82
DIAGNOSTICS PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)

B: NO TROUBLE CODE
DIAGNOSIS:
ABS warning light circuit is shorted.
TROUBLE SYMPTOM:

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