1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
ABS-3
Possible failure
Rear wheel speed sensor, Harness, Hydraulic unit
Disconnect
Q-01
(11-pin)
con-
nector.
Check continuity
at
harness side.
Q-01 (11-pin) Continuity
G (2H) Ground No YG (2E) Ground No
Measure side.
Q-01 (11-pin) Resistance
YG (2E) YL (2F) 800—1200
fi
G (2H)
] L
(2J) 800—1200
fi
OK
Connect Q-01 (11-pin) connector. Jump GB
to B at
Q-07 connector. Start engine.
Check that warning light stays ON. Drive vehicle and check that warn-ing light flashes (0.25 sec ON OFF) at
15
km/h
(9
mph).
NG
Repair harness (Control unit
—
Rear speed sensor)
OK
resistance
at
harness
NG
Disconnect Q-09 and Q-05 Measure resistance
at
sensor.
Q-09, Q-05 Resistance
YG YL 800-1200
0
G L 800-1200
0
OK
Check followings* • Clearance between sensor and rotor standard: 0.3—1.1
mm
(0.012-0.043
in)
• Objects sticking
to
sensor
or
rotor
• Damaged sensor
or
rotor
• Sensor installation Tightening torque: 16-23 N-m
(1.6—2.3 m-kg, 12—17 ft-lb)
NG
Repair
or
replace
as
necessary
NG
Check Q-01 connector. Replace control unit.
or
OK
Replace hydraulic unit,
Replace rear wheel speed
sensor.
OK
Repair harness.
(Control unit
—
Rear speed sensor)
* All conditions can
be
verified
as
follows,
if an AC
voltmeter
is
available. 1. Jack
up
vehicle. 2. Measure sensor voltage while rotating rear wheel
one
revolution
per
second.
fi
wheel Q-01 (11-pin) Voltaqe (AC)
Left |YG (2E) YL (2F) More than 0.25V Right G (2H) L(2J)
More than 0.25V
86U11X-147
11-78
1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
DIAGNOSIS INDICATION MODE
To obtain the diagnosis indication mode, proceed as
follows:
1. Remove the driver's seat.
2. Connect terminal wires (GB) and (B) of the check
connector (at control unit) with a jumper wire.
3. Start the engine.
Note
The system is now in the diagnosis indication
mode.
86U11X-162
4. Observe the warning light for illumination or count
flashing.
5. Connect an analog voltmeter to terminal wire (GR),
and count the times voltage is output.
Note
a) The voltmeter will fluctuate between OV and
approx. 12V.
b) Determine the failure and flow chart num-
ber with the Diagnosis Table. (Refer to page
11—75.)
76G11X-059
86U11X-164
86U11X-165
MEMORY CANCEL
Note
Failures are contained in the control unit mem-
ory. They are not erased when the battery is
disconnected. Follow the procedure below to
erase them.
1. Connect the terminal wires (GR) and (GB) of the
check connector with a jumper wire.
2. Turn the ignition switch ON.
3. Check that the warning light is illuminated, and wait
1—2 seconds.
4. Turn the ignition switch OFF.
5. Disconnect the jumper wire from terminal wire (GR).
6. Start the engine and wait for the warning light to
go OFF.
Note
a) One failure memory is erased each time the
above steps are taken.
b) If the warning light illuminates or blinks af-
ter step 6, read and note diagnosis indica-
tion. The memory has the capacity for
storing 32 failures.
7. Turn the ignition switch OFF.
8. Remove the jumper wire.
11-86
