Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1997 1997 Service Manual 1997 LEGACY MANUAL SUPPLEMENT ABS 5.3I SYSTEM Diagnostics Section MSA5T9712A29597

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MSA5T9712A29597


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4-4d [T1oo]                             BRAKES [ABS 5.31 TYPE]
1 . Supplemental Restraint System "Airbag" - 2. Pre-inspection


                                                 1 . Supplemental Restraint System
                                                 "Airbag"
                                                Airbag system wiring harness is routed near the ABS
                                                sensor, ABS control module and hydraulic control unit .
                                                CAUTION:
                                                  All Airbag system wiring harness and connectors are
                                                colored yellow. Do not use electrical test equipment on
                                                these circuit .
                                                e Be careful not to damage Airbag system wiring har-
                                                ness when servicing the ABS sensor, ABS control mod-
                                                ule and hydraulic control unit.




                                                2. Pre-inspection
                                                Before performing diagnostics, check the following items
                                                which might affect ABS problems :
                                                A: MECHANICAL INSPECTION
                                                1 . POWER SUPPLY
                                                1) Measure battery voltage and specific gravity of electro-
                                                lyte .
                                                Standard voltage: 12 V, or more
                                                Specific gravity: Above 1 .260
                                                2) Check the condition of the main and other fuses, and
                                                harnesses and connectors . Also check for proper ground-
                                                ing.

                                                2. BRAKE FLUID
                                                1) Check brake fluid level.
                                                2) Check brake fluid leakage.

                                                3. BRAKE DRAG
                                                Check brake drag . < Ref. to 4-4 [K100] .*1 >

                                                4. BRAKE PAD AND ROTOR
                                                Check brake pad and rotor. < Ref. to 4-4 [K100] .*1 >

                                                5. TIRE SPECIFICATIONS, TIRE WEAR AND AIR
                                                PRESSURE
                                                Check tire specifications, tire wear and air pressure . < Ref.
                                                to 4-2 [S1 A1 ], [S1 A2] .*1 >



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                      BRAKES [ABS 5.3i TYPE]                                    [TZBi] 4-4d
                                                                              2. Pre-inspection


                               B: ELECTRICAL INSPECTION
                               1 . WARNING LIGHT ILLUMINATION PATTERN




                                                         START
                                              ON         r~              ON
                         OFF
Ignition key switch




                                       Illuminates.

                       Goes out.                             Goes out.
ABS warning light
                                          1 .5 s
                                   4               111




                                                                                      B4M0781A


                               1) When the ABS warning light does not illuminate in
                               accordance with this illumination pattern, there must be
                               an electrical malfunction .
                               2) When the ABS warning light remains constantly OFF,
                               repair the ABS warning light circuit or diagnosis circuit.
                               
                               NOTE :
                               Even though the ABS warning light does not go out 1 .5
                               seconds after it illuminates, the ABS system operates nor-
                               mally when the warning light goes out while driving at
                               approximately 12 km/h (7 MPH) . However, the Anti-lock
                               brakes do not work while the ABS warning light is illumi-
                               nated .




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