1997 SUBARU LEGACY check engine

B4M0796A
10C5
CHECK POWER SUPPLY OF ABSCM.
1) Disconnect connector from ABSCM.
2) Start engine.
3) Idle the engine.
4) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 28 (+)—Chassis ground ():
Is voltage 10—15 V?
: Go to step10C6.
: Repair ABSCM power supply circuit.
B4M0797A
10C6
CHECK GROUND CIRCUIT OF ABSCM.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 1—Chassis ground:
(F49) No. 55—Chassis ground:
Is resistance less than 0.5Ω?
: Repair harness/connector between ABSCM and
select monitor.
: Go to step10C7.
127
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10Q2CHECK THE CONDITION WHEN THE
TROUBLE OCCURRED.
Ask the vehicle owner about driving conditions when the
trouble occurred. Attempt to duplicate the conditions.
: Is the trouble immediately apparent?
: Go to next.
: Go to step 11.
: Did the trouble occur immediately after
engine starting or during standing starts?
: Go to step10Q9.
: Go to step10Q3.
B4M0824B
10Q3CHECK RESISTANCE OF SOLENOID
VA LV E .
1) Turn ignition switch to OFF.
2) Disconnect two connectors (ABS1, F9) from hydraulic
unit.
3) Measure resistance between hydraulic unit connector
terminals.
: Trouble code/Connector & terminal
31/to (F9) No. 4—to (ABS1) No. 2
33/to (F9) No. 1—to (ABS1) No. 2
35/to (F9) No. 2—to (ABS1) No. 2
37/to (F9) No. 3—to (ABS1) No. 2
Is resistance 8.5±0.7Ω?
: Go to step10Q4.
: Replace hydraulic unit.
161
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10U2CHECK THE CONDITION WHEN THE
TROUBLE OCCURRED.
Ask the vehicle owner about driving conditions when the
trouble occurred. Attempt to duplicate the conditions.
: Is the trouble immediately apparent?
: Go to next.
: Go to step10U11.
: Did the trouble occur immediately after
engine starting or during standing starts?
: Go to step10U9.
: Go to step10U3.
B4M0831B
10U3CHECK RESISTANCE OF SOLENOID
VA LV E .
1) Turn ignition switch to OFF.
2) Disconnect two connectors (ABS1, F9) from hydraulic
unit.
3) Measure resistance between hydraulic unit connector
terminals.
: Trouble code/Connector & terminal
32/to (F9) No. 8—to (ABS1) No. 2
34/to (F9) No. 5—to (ABS1) No. 2
36/to (F9) No. 6—to (ABS1) No. 2
38/to (F9) No. 7—to (ABS1) No. 2
Is resistance 4.3±0.5Ω?
: Go to step10U4.
: Replace hydraulic unit.
173
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0430
10W1
CHECK GENERATOR.
1) Start engine.
2) Idling after warm-up.
3) Measure voltage between generator B terminal and
chassis ground.
: Terminal
Generator B terminal—Chassis ground
Is voltage 10—15 V?
: Go to step10W2.
: Repair generator.
10W2
CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
: Are the positive and negative battery termi-
nals tightly clamped?
: Go to step10W3.
: Tighten the clamp of terminal.
B4M0842A
10W3
CHECK INPUT VOLTAGE OF ABSCM.
1) Disconnect connector from ABSCM.
2) Run the engine at idle.
3) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 28 (+)—Chassis ground ()
Is voltage 10—15 V?
: Go to step10W4.
: Repair harness connector between battery, igni-
tion switch and ABSCM.
186
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

When ABS warning light illuminates, read and record
trouble code indicated by ABS warning light.
B: CHECK LIST FOR INTERVIEW
Check the following items about the vehicle’s state.
1. THE STATE OF THE ABS WARNING LIGHT
ABS warning light
comes on.Always
Sometimes
Only once
Does not come on

When /how long does it come on?:
Ignition key positionLOCK
ACC
ON (before starting engine)
START
On after starting (Engine is running)
On after starting (Engine is stop)
TimingImmediately after ignition is ON.
Immediately after ignition starts.
When advancing km/h to km/h
MPH to MPH
While traveling at a constant speed km/h MPH
When decelerating km/h to km/h
MPH to MPH
When turning to right Steering angle : deg
Steering time : sec
When turning to left Steering angle : deg
Steering time : sec
When moving other electrical parts

Parts name :

Operating condition :
2. SYMPTOMS
ABS operating
conditionPerforms no work.
Operates only when abruptly applying brakes. Vehicle speed : km/h
MPH

How to step on brake pedal :
a) Operating time :sec
b) Operating noise :Produce /Does not produce

What kind of noise?Knock
Gong gong
Bong
Buzz
Gong gong buzz
Others :
c) Reaction force of brake pedal
Stick
Press down once with a clunk
Press and released
Others :
11
4-4dBRAKES [ABS 5.3i TYPE]
6. Diagnostics Chart for On-board Diagnosis System

7A1CHECK IF OTHER WARNING LIGHTS
TURN ON.
Turn ignition switch to ON (engine OFF).
: Do other warning lights turn on?
: Go to step7A2.
: Repair combination meter.
7A2
CHECK ABS WARNING LIGHT BULB.
1) Turn ignition switch to OFF.
2) Remove combination meter.
3) Remove ABS warning light bulb from combination
meter.
: Is ABS warning light bulb OK?
: Go to step7A3.
: Replace ABS warning light bulb.
B4M1273A
7A3CHECK BATTERY SHORT OF ABS
WARNING LIGHT HARNESS.
1) Disconnect connector (B100) from connector (F2).
2) Measure voltage between connector (B100) and chas-
sis ground.
Connector & terminal
(B100) No. 9 (+) — Chassis ground ():
: Is the voltage less than 3 V?
: Go to step7A4.
: Repair warning light harness.
17
4-4dBRAKES [ABS 5.3i TYPE]
7. Diagnostics Chart for ABS Warning Light Circuit and Diagnosis Circuit Failure

B4M0430
7B4
CHECK GENERATOR.
1) Start the engine.
2) Idle the engine.
3) Measure voltage between generator and chassis
ground.
Terminal
Generator B terminal (+)—Chassis ground ():
: Is the voltage between 10 and 15 V?
: Go to step7B5.
: Repair generator.
7B5
CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
: Is there poor contact at battery terminal?
: Repair battery terminal.
: Go to step7B6.
B4M1234A
7B6
CHECK POWER SUPPLY OF ABSCM.
1) Disconnect connector from ABSCM&H/U.
2) Start engine.
3) Idle the engine.
4) Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 1 (+)—Chassis ground ():
: Is the voltage between 10 and 15 V?
: Go to step7B7.
: Repair ABSCM&H/U power supply circuit.
7B7
CHECK WIRING HARNESS.
1) Disconnect connector (F2) from connector (B100).
2) Turn ignition switch to ON.
: Does the ABS warning light remain off?
: Go to step7B8.
: Repair front wiring harness.
B4M1235A
7B8
CHECK PROJECTION AT ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Check for broken projection at the ABSCM&H/U termi-
nal.
: Are the projection broken?
: Go to step7B9.
: Replace ABSCM&H/U.
23
4-4dBRAKES [ABS 5.3i TYPE]
7. Diagnostics Chart for ABS Warning Light Circuit and Diagnosis Circuit Failure

B4M1234A
8N1CHECK INPUT VOLTAGE OF
ABSCM&H/U.
1) Disconnect connector from ABSCM&H/U.
2) Run the engine at idle.
3) Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 1 (+)—Chassis ground ():
: Is the voltage between 10 V and 15 V?
: Go to step8N2.
: Repair harness connector between battery, igni-
tion switch and ABSCM&H/U.
B4M1243A
8N2CHECK GROUND CIRCUIT OF
ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM&H/U connector
and chassis ground.
Connector & terminal
(F49) No. 23—Chassis ground:
: Is the resistance less than 0.5Ω?
: Go to step8N3.
: Repair ABSCM&H/U ground harness.
8N3CHECK POOR CONTACT IN CONNEC-
TORS.
: Is there poor contact in connectors between
generator, battery and ABSCM&H/U? to FOREWORD [T3C1].>
: Repair connector.
: Go to step8N4.
48
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light