Page 1673 of 2248
B4M0279B
1. CHECK INPUT VOLTAGE OF A.B.S. CONTROL
MODULE.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. control module.
3) Measure voltage between A.B.S. control module con-
nector terminals.
Connector & terminal / Specified voltage:
(P3) No. 25—No. 10 / More than 4 V (when brake
pedal is depressed.)
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7. Diagnostics Chart with Trouble Code
Page 1674 of 2248
L: TROUBLE CODE 56
—USE OF IMPROPER A.B.S. CONTROL
MODULE SPECIFICATION, OR FAULTY G
SENSOR—
DIAGNOSIS:
Improper A.B.S. control module specification
Faulty G sensor
Faulty G sensor harness and connector
TROUBLE SYMPTOM:
A.B.S. does not operate.
A.B.S. activates faster than specifications when braking
on high“µ”(dry asphalt) road.
Warning light comes on and trouble code“56”is dis-
played approximately 20 seconds after vehicle starts.
Check A.B.S. control module specification.
OK
Not OK
Replace A.B.S. control module.
1. Check continuity in G sensor circuit on A.B.S.
control module side.
Not OK
OK
Faulty A.B.S. control module.
(Replace after inspection of power supply.)
2. Check G sensor.
Not OK
OK
3. Check harness between A.B.S. control module
and G sensor.
Replace G sensor.
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7. Diagnostics Chart with Trouble Code
Page 1675 of 2248
B4M0610
B4M0281B
1. CHECK CONTINUITY IN G SENSOR CIRCUIT ON
A.B.S. CONTROL MODULE SIDE.
1) Position vehicle on a flat surface.
2) Disconnect connector from A.B.S. control module.
3) Measure resistance between A.B.S. control module
connector terminals.
Connector & terminal / Specified resistance:
(P3) No. 1—No. 13 / 550—670Ω
B4M0353A
2. CHECK G SENSOR.
1) Disconnect G sensor connector.
2) Measure resistance between G sensor terminals.
(Ensure that G sensor is horizontal during measurement.)
Specified resistance:
550—670Ω
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7. Diagnostics Chart with Trouble Code
Page 1676 of 2248
B4M0283B
3. CHECK HARNESS BETWEEN A.B.S. CONTROL
MODULE AND G SENSOR.
1) Turn ignition switch ON.
2) Connect G sensor connector.
3) Measure voltage between connector and body.
Connector & terminal / Specified voltage:
(B23) No. 1—Body / 10—12 V
(P3) No. 13—Body / 10—12 V
NOTE:
When voltage checks out“OK”, replace A.B.S. control
module.
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7. Diagnostics Chart with Trouble Code
Page 1677 of 2248

8. General Diagnostics Chart
A: VIBRATING PEDAL AND NOISE
Depress brake pedal
abruptly to check if
such problems occur
while A.B.S. is in
operation.
Ye s
NoNormal
When do problems
occur?When engine
starts.Check using on-board diagnosis system accord-
ing to trouble code.
Before vehicle
attains initial 10
km/h (6 MPH)
speed immediately
after engine starts.Do problems stop
within 5 seconds?
No
Ye s
Normal
Go to1.
Only when vehicle
is being driven.
Brake pedal is
released.
A.B.S. sometimes operates when variations in
wheel rotating speed occur:
a. During shifts. (AT model: Band brake locks
wheels. MT model: Abrupt engine brake opera-
tion locks wheels.)
b. During clutch operation. (Engine brake opera-
tion locks wheels.)
c. When riding over an obstacle.
d. During rough-road driving.
e. During“U”turns. (“Slip”signal often is emit-
ted.)
f. When wheels are stuck.
Except for those out-
lined above.Go to1.
Brake pedal is
depressed.
A.B.S. sometimes
operates except when
brake pedal is
depressed abruptly:
a. Low“µ”roads.
b.“U”turns during
high-speed operations.
c. During rough-road
driving.
d. When tire chains
are installed.
e. Use of improper
tires.
f. Excessive free play
of wheels and associ-
ated parts.Check tire pres-
sure.
(Premature wear
may occur if tires
other than those
specified are
used.)
a. Use specified
tires.
b. Adjust tire pres-
sure evenly.
c. Use of an
“emergency”tire.
d. Check wheels
and associated
parts if excessive
free play is noted.
1Except for those
outlined above.Go to1.
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8. General Diagnostics Chart
Page 1678 of 2248
1
Pedal vibration
and noise occur
when any electric
switch is operated.Noise occurs in
body harnesses.Check that car
telephone, personal
receiver transmitter,
etc. are installed prop-
erly as required by
laws or regulations.
Check that harnesses
are routed properly.
Check that harnesses
are free from twisting
(or maintained to less
than 35-mm pitch).
Check that harnesses
are not routed too
closely to other electri-
cal units which could
serve as a source of
noise.
2
Check if vehicle
profile is correct.
(Front end of
vehicle tilts down
greater than rear
end.)Check wheel arch height
and adjust as required.
Warning light
comes on.Check using on-board
diagnosis system, accord-
ing to trouble code.
Warning light will
not go on for 1.5
seconds after igni-
tion switch is
turned on.Trouble in warning light
drive circuit.
[T7A0].>
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8. General Diagnostics Chart
Page 1679 of 2248

B: EXCESSIVE STOPPING DISTANCE
Stopping distance is
too great.Snowy or sandy (low“µ”) roadsStopping distance may sometimes be longer
than for models not equipped with A.B.S.
Check if stopping
distance continues
to be excessive
when A.B.S. is inac-
tivated by discon-
necting hydraulic
control unit connec-
tor.
Ye sCheck wheels and
associated parts for
looseness.
Check tires for
improper specifica-
tions.
Check G sensor for
improper operation.
Bleed air from brake
line.
Check brake system
for abnormalities.
NoHydraulic control
unit operation
check.
[W15B0].>NoCheck hydraulic
control unit.
Ye sGo to A-1.
C: IMPROPER PEDAL OPERATION
Pedal does not
operate prop-
erly.
Long pedal
stroke
Check if brakes
operate prop-
erly.
Ye sOn A.B.S. equipped model, pedal stroke may be
slightly longer than for models which are not
equipped with A.B.S.
NoBleed air from
brake line.
Short pedal
stroke
Check if brakes
operate prop-
erly.
Ye sNormal
NoCheck if brakes
operate prop-
erly when
A.B.S. is inacti-
vated by dis-
connecting
hydraulic con-
trol unit connec-
tor.Ye sGo to A-1.
NoCheck brake
system.
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8. General Diagnostics Chart
Page 1680 of 2248
D: A.B.S. INOPERATIVE
A.B.S. does not operate.
Warning light comes on.Check using on-board diagnosis
system.
Check if abnormalities are noted
when brakes are applied at a speed
less than 10 km/h (6MPH).Normal
Except for those outlined aboveGo to A-2.
E: FREQUENT A.B.S. OPERATION
A.B.S.
operates
frequently.
Check if
brake force
is properly
distributed
to wheels.
Ye s
Faulty
A.B.S. sen-
sor systemCheck
A.B.S. sen-
sor.
Excessive front axle free play
Go to A-1.
NoCheck
brake sys-
tem.
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8. General Diagnostics Chart