1996 TOYOTA T100 sensor

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BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
−VHigh Speed
Low Speed
CoilNS
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−341
1996 TOYOTA T100 (RM449U)
DTC 31 − 36 Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS system. The front and rear rotors each have 48 serra-
tions.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.

DTC No.DTC Detecting ConditionTrouble Area
31, 32, 33, 34
Detection of any of conditions 1 through 3:
1. At vehicle speed of 10 km/h (6 mph) or more, pulses are
not input for 15 sec.
2. Momentary interruption of speed sensor signal occurs at
least 7 times in time between switching the ignition
switch ON and switching it OFF.
3. Abnormal fluctuation of speed sensor signals with ve-
hicle speed 20 km/h (12 mph) or more.
4. An open is detected in speed sensor circuit for 0.6 sec.
Right front, left front, right rear, left rear speed sensor
Open or short in each speed sensor circuit
ECU
35
Speed sensor signal is not input for about 1 sec. while left
front and right rear speed sensor signals are being
checked with IG switch ON.Open in left front or right rear speed sensor circuit
ECU
36
Speed sensor signal is not input for about 1 sec. while right
front and left rear speed sensor signals are being checked
with IG switch ON.Open in right front or left rear speed sensor circuit
ECU
HINT:
DTC No. 31 is for the right front speed sensor.
DTC No. 32 is for the left front speed sensor.
DTC No. 33 is for the right rear speed sensor.
DTC No. 34 is for the left rear speed sensor.
Fail safe function:
If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
DI10D−02

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Right
Front
Speed
Sensor
Left
Front
Speed
Sensor
Read Speed SensorABS ECU
Right
LeftA16
A16
A16
A16
A15
A15
A15
A15
A15FR+
A16 FR−
FSS
FL+
FL−
RR+
RR−
RSS
RL+
RL− IA3
IA3
IA3
BJ2
BJ2
BJ2
BJ2
BJ2
BJ2 A20
A20
A20
A20 A7
A7Y−G W
R
R G
B
W
BR−B
P
L6
2
1
2
1 4
3G
R
B
W
P11
12
16
14
15679
5 A8
A82
17
16
13 14
15
16
23
1
2
L DI−342
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM

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Front
1
2
R15781
Rear
2
1
34
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−343
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.6 − 1.8 kΩ
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 MΩ or higher
Rear
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2, 3 and 4 of
speed sensor connector.
OK:
Resistance: 0.6 − 2.05 kΩ
CHECK:
Measure resistance between terminals 1 and 2, 3 and 4 of
speed sensor connector and body ground.
OK:
Resistance: 1 MΩ or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI−321).
OK
2 Check for open and short in harness and connector between each speed sensor
and ECU (See page IN−26).
NG Repair or replace harness or connector.
OK

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R07772
BR3795
OK
NG
DI−344
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
3 Check sensor rotor and sensor installation.
Front
PREPARATION:
Remove the axle hub (See page SA−16 or SA−23).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
Rear
PREPARATION:
Remove the axle shaft (See page SA−131).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and steering
knuckle or rear axle carrier.
NG Replace speed sensor or rotor.
NOTICE:
Check the speed sensor signal last (See page DI−321).
OK
Check and repalce ABS ECU.

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DI−345
1996 TOYOTA T100 (RM449U)
DTC 37 Neither Front Speed Sensor Rotor Missing
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
37
With front wheels stationary and rear wheels rotating at
20+ km/h (12+ mph) for 10+ secs, turn ignition switch ON
then OFF 8 times, in succession.Front axle hub
Right front, left front speed sensor
Wire harness for sensor system
ECU
INSPECTION PROCEDURE
1 Check front axle hub (See page SA−15 or SA−22).
NG Replace front axle hub.
OK
2 Check front speed sensor (See page DI−341).
NG Replace front speed sensor.
OK
3 Check for open or short in harness and connector between speed sensor and
ECU (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.
DI10F−01

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Fuse Box
on J/B No.1
ECU−IG
4WD: Deceleration Sensor R/B
No.2IG SwitchABS ECU
BatteryW−B B−Y
AM1 ALT
IG1
GND
GND W−B
W−B
W
F7 14
6
IC
A15 IA3
W
W
BB
BA15
A15F75
3110
11
24 6
2
5
2
2
2
2 1
W
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−347
1996 TOYOTA T100 (RM449U)
DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the actuators.
DTC No.DTC Detecting ConditionTrouble Area
41
Vehicle speed is 3 km/h (1.9 mph) or more and voltage of
ECU terminal IG1 remains at more than 17 V or below 9.5
V for more than 10 sec.Battery
IC regulator
Open or short in power source circuit
ECU
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
WIRING DIAGRAM
DI10J−01

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− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 43 Malfunction in Deceleration Sensor
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
43
Either of following 1 or 2 is detected:
1. After the battery terminal is connected, input from the
deceleration sensor does not change at one cycle (0
km/h → more than 30 km/h → 0 km/h) for 16 times con-
tinuously.
2. When the brake pedal is not depressed at vehicle speed
of 5 km/h or more, forward and backward G (more than
0.4 G) is detected for 30 seconds or more.
Deceleration sensor
Wire harness for deceleration sensor system
ECU
INSPECTION PROCEDURE
1 Check deceleration sensor (See page DI−321).
NG Replace deceleration sensor.
OK
2 Check for open or short in harness and connector between sensor and ECU
(See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.
DI10K−01

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6
ECU−IGABS ECU
L−W
LG
L
W−B 2 3
Deceleration
SensorA15ABS ECU
GS1
GS2
GST
GGND 19
7
5
18 GS1
GS2
GST IG1
A15
A15
A15 1 A14
A14
A14 A144
A146 5
F7 F7B
B Fuse Box
on J/B No.1
IG Switch
GGND
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−351
1996 TOYOTA T100 (RM449U)
DTC 44 Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS control. If the sensor func-
tions abnormally, the ABS warning light comes on but the ABS still operates.
DTC No.DTC Detecting ConditionTrouble Area
44
Either of following 1 or 2 is detected:
1. An open or short is detected in circuit GS1 or GS2 for
1sec.
2. After the ignition is turned ON, test signal is output by
GST. During this time, a trouble signal is detected for 0.5
sec.
Deceleration sensor
Open or short in deceleration sensor circuit
ECU
WIRING DIAGRAM
DI10M−03