Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 2004 4 - Chassis ABS (Diagnostics) Diagnostics Procedure without Diagnostic Trouble Code (DTC)
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DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
12.Diagnostics Procedure without Diagnostic Trouble Code (DTC)
A: ABS WARNING LIGHT DOES NOT COME ON.
DIAGNOSIS:
ABS warning light circuit is open or shorted.
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), ABS warning light does not come on.
WIRING DIAGRAM:
BATTERY
SBF-3 SBF-1
SBF-4
IGNITION
SWITCH
E
No.14
B36
5
i1
No.18
B9
COMBINATION
METER
PARKING BRAKE
No.8
WARNING
A: i12
LIGHT
WARNING
B: i10 DIAGNOSIS
ABS
TERMINAL
LIGHT
C: i11
B82
6
A7
C6
B81
F44
2
i3 i1
B61
23
31
B38 B36
23
24
21
22
1
4
B301 ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT E E
C: i11
B36 B301
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
12 13 14 15 16 17 18 19 20 21 22 23 24 16 17 18 19 20 21 22
23 24 25 26
27 28 29 30 31
B: i10 A: i12 B82 B38
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 1 2 10 11 12 13 14 15 16 17 18 19 20 21
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 7 8 9 10 11 12 13 14 3 4 5 6 22 23 24 25 26 27 28 29 30 31 32
ABS00393
ABS-30
DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step Check Yes No
1 CHECK IF OTHER WARNING LIGHTS TURN Are other warning lights turned Go to step 2. Repair the combi-
ON. on? nation meter.
Turn the ignition switch to ON (engine OFF).
2 CHECK ABS WARNING LIGHT BULB. Is the ABS warning light bulb Replace the ABS Go to step 3.
1) Turn the ignition switch to OFF. open? warning light bulb.
2) Remove the combination meter.
3 CHECK BATTERY SHORT OF ABS HAR- Is the voltage less than 3V? Go to step 4. Repair battery
NESS. short in the warn-
1) Disconnect the connector (i1) from connec- ing light harness.
tor (B36).
2) Measure the voltage between connector
(i1) and chassis ground.
Connector & terminal
(i1) No. 23 (+) -- Chassis ground (-):
4 CHECK BATTERY SHORT OF ABS HAR- Is the voltage less than 3V? Go to step 5. Repair battery
NESS. short in the warn-
1) Turn the ignition switch to ON. ing light harness.
2) Measure the voltage between connector
(i1) and chassis ground.
Connector & terminal
(i1) No. 23 (+) -- Chassis ground (-):
5 CHECK WIRING HARNESS. Is the voltage 10 -- 15 V? Go to step 6. Repair the wiring
1) Turn the ignition switch to OFF. harness.
2) Install the combination meter.
3) Turn the ignition switch to ON.
4) Measure the voltage between connector
(i1) and chassis ground.
Connector & terminal
(i1) No. 23 (+) -- Chassis ground (-):
6 CHECK BATTERY SHORT OF ABS HAR- Is the voltage less than 3V? Go to step 7. Repair the wiring
NESS. harness.
1) Turn the ignition switch to OFF.
2) Measure the voltage between connector
(B36) and chassis ground.
Connector & terminal
(B36) No. 23 (+) -- Chassis ground (-):
7 CHECK BATTERY SHORT OF ABS WARN- Is the voltage less than 3V? Go to step 8. Repair the wiring
ING LIGHT HARNESS. harness.
1) Turn the ignition switch to ON.
2) Measure the voltage between connector
(B36) and chassis ground.
Connector & terminal
(B36) No. 23 (+) -- Chassis ground (-):
8 CHECK GROUND CIRCUIT OF ABSCM&H/U. Is the resistance less than 0.5 Go to step 9. Repair the
1) Turn the ignition switch to OFF. ABSCM&H/U
2) Disconnect the connector from ABSCM&H/U. ground harness.
3) Measure the resistance between
ABSCM&H/U and chassis ground.
Connector & terminal
(B301) No. 23 -- Chassis ground:
9 CHECK WIRING HARNESS. Is the resistance less than 0.5 Go to step 10. Repair the har-
Measure the resistance between connector ness/connector.
(B36) and chassis ground.
Connector & terminal
(B36) No. 23 -- Chassis ground:
ABS-31
DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step Check Yes No
10 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con- Replace the Repair the con-
Turn the ignition switch to OFF. nectors between combination ABSCM&H/U. nector.
meter and ABSCM&H/U?
ABS-32
DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
B: ABS WARNING LIGHT DOES NOT GO OFF.
DIAGNOSIS:
ABS warning light circuit is open or shorted.
TROUBLE SYMPTOM:
When starting the engine and while ABS warning light is kept ON.
WIRING DIAGRAM:
BATTERY
SBF-3 SBF-1
SBF-4
IGNITION
SWITCH
E
No.14
B36
5 i1
No.18
B9
COMBINATION
METER
PARKING BRAKE
No.8
WARNING
A: i12
LIGHT
WARNING
B: i10 DIAGNOSIS
ABS
TERMINAL
LIGHT
C: i11
B82
6
A7
C6
B81
F44
2
i3 i1
B61
23
31
B38 B36
23
24
21
22
1
4
B301 ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT E E
C: i11
B36 B301
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
12 13 14 15 16 17 18 19 20 21 22 23 24 16 17 18 19 20 21 22
23 24 25 26
27 28 29 30 31
B: i10 A: i12 B82 B38
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 1 2 10 11 12 13 14 15 16 17 18 19 20 21
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 7 8 9 10 11 12 13 14 3 4 5 6 22 23 24 25 26 27 28 29 30 31 32
ABS00393
ABS-33
DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step Check Yes No
1 CHECK INSTALLATION OF ABSCM&H/U Is the ABSCM&H/U connector Go to step 2. Insert the
CONNECTOR. inserted into ABSCM until the ABSCM&H/U con-
Turn the ignition switch to OFF. clamp locks onto it? nector into
ABSCM&H/U until
the clamp locks
onto it.
2 CHECK GROUND TERMINAL. Is the resistance less than 0.5 Go to step 3. Repair the diagno-
Measure the resistance between ground termi- ? sis terminal har-
nals (B81) and chassis ground. ness.
Terminals
Ground terminal (A) -- Chassis ground:
Ground terminal (B) -- Chassis ground:
3 CHECK DIAGNOSIS LINE. Is the resistance less than 0.5 Go to step 4. Repair the har-
1) Connect the ground terminal (B81) to diag- ? ness connector
nosis connector (B82) No. 6. between
2) Disconnect the connector from ABSCM& ABSCM&H/U and
H/U. diagnosis connec-
3) Measure the resistance between tor.
ABSCM&H/U connector and chassis ground.
Connector & terminal
(B301) No. 4 -- Chassis ground:
4 CHECK GENERATOR. Is the voltage 10 -- 15 V? Go to step 5. Repair the genera-
1) Start the engine. tor.
and chassis ground.
Terminal
Generator B terminal (+) -- Chassis
ground (-):
5 CHECK BATTERY TERMINAL. Is there poor contact at battery Repair or tighten Go to step 6.
Turn the ignition switch to OFF. terminal? the battery termi-
nal.
6 CHECK POWER SUPPLY OF ABSCM. Is the voltage 10 -- 15 V? Go to step 7. Repair the
1) Start the engine. ABSCM&H/U
2) Idle the engine. power supply cir-
3) Measure the voltage between ABSCM&H/ cuit.
U connector and chassis ground.
Connector & terminal
(B301) No. 1 (+) -- Chassis ground (-):
7 CHECK WIRING HARNESS. Does the ABS warning light Repair the front or Go to step 8.
1) Disconnect the connector (i1) from connec- turn on? body wiring har-
tor (B36). ness.
2) Turn ignition switch to ON.
8 CHECK TERMINAL AT ABSCM&H/U. Is there damage on terminal? Replace the Go to step 9.
1) Turn the ignition switch to OFF. ABSCM&H/U.
2) Check for damage at the ABSCM&H/U ter-
9 CHECK ABSCM&H/U. Is the resistance more than 1 Go to step 10. Replace the
Measure the resistance between ABSCM&H/U M? ABSCM&H/U.
terminals.
ABS-34
DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step Check Yes No
10 CHECK WIRING HARNESS. Is the resistance less than 0.5 Go to step 11. Repair the har-
Measure the resistance between connector ? ness.
(B36) and chassis ground.
Connector & terminal
(B36) No. 23 -- Chassis ground:
11 CHECK WIRING HARNESS. Is the resistance more than 1 Go to step 12. Repair the har-
1) Connect the connector to ABSCM&H/U. M? ness.
2) Measure the resistance between connector
(B36) and chassis ground.
Connector & terminal
(B36) No. 23 -- Chassis ground:
12 CHECK POOR CONTACT IN ABSCM&H/U Is there poor contact in Repair the con- Replace the
CONNECTOR. ABSCM&H/U connector? nector. ABSCM&H/U.
ABS-35
DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
C: ABS AND BRAKE WARNING LIGHT DO NOT GO OFF.
DIAGNOSIS:
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