relay TOYOTA T100 1996 Factory Manual PDF

Downloaded from www.Manualslib.com manuals search engine BE6653
R14203
F00001
LOCK
2
6 A5
R13727
5
4
3
11 ABS Control
Relay
ABS
Actuator
ABS ECUA4
A4A4 A4
A16
A5
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−333
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminals A5 − 2 and A5 − 6 of ABS control relay
connector.
PREPARATION:
Disconnect the ABS control relay connector.
CHECK:
Measure the voltage between terminals A5 − 2 and A5 − 6 of
ABS control relay harness side connector.
OK:
Voltage: 10 − 14 V
NG Check and repair harness or connector.
OK
2 Check continuity between terminals A5 − 5 and A4 − 4, A4 − 4 and A4 − 3, A4 − 3
and A16 − 11 .
PREPARATION:
Disconnect the 2 connectors from the ABS actuator.
CHECK:
Check continuity between terminals A5 − 5 and A4 − 4, A4 − 4
and A4 − 3, A4 − 3 and A16 − 11 .
OK:
Continuity
HINT:
There is a resistance of 26 ∼ 40 Ω between terminals A4 − 4 and
A4 − 3.
NG Repair or replace harness or ABS actuator.
OK

Downloaded from www.Manualslib.com manuals search engine R14139
Continuity
Open
Continuity
1 2
6 3 A6A5
5
R14140
(−)
(+)
Continuity
Open
36
51 2
A6A5
DI−334
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
3 Check ABS control (solenoid) relay.
CHECK:
Check continuity between each terminal of ABS control (sole-
noid) relay.
OK:
Terminals A5 − 1 and A6 − 3Continuity (Reference value 80 Ω)
Terminals A5 − 5 and A5 − 6Continuity
Terminals A5 − 2 and A5 − 5Open
CHECK:
(a) Apply battery positive voltage between terminals A5 − 1
and A6 − 3.
(b) Check continuity between each terminal of ABS control
(solenoid) relay.
OK:
Terminals A5 − 5 and A5 − 6Open
Terminals A5 − 2 and A5 − 5Continuity
NG Replace ABS control relay.
OK
4 Check for open and short in harness and connector between ABS control relay
and ABS ECU (See page IN−26).
NG Repair or replace harness or connector.
OK
If same code is still output after DTC is deleted, check contact condition of each connection.
If connections are normal, ECU may be defective.

Downloaded from www.Manualslib.com manuals search engine F14589
ABS Contorl Relay
ABS ActuatorABS ECU
R/B
No.2Motor
Relay
Solenoid
Relay
ABS ECUDLC1
ABS
Battery
A16
A16
A16
A16
A16 A6
A6
A5
A4
A4 A4
A4 A5
A6 A6
A5
A5
A4 EA1
EA1
ID
MR
R−
SR
AST
MT R−B
G−B
R−W
R−Y
R−L W−B
W−B W
W W
W
W
R−L
W−R
LG
4
15
5 4
3
1
3
5 1
2
6
1 5 10
10 2
2
92
25
4
11
8
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−335
1996 TOYOTA T100 (RM449U)
DTC 13, 14 ABS Control (Motor) Relay Circuit
CIRCUIT DESCRIPTION
The ABS control (motor) relay supplies power to the ABS pump motor. While the ABS is activated, the ECU
switches the ABS control (motor) relay ON and operates the ABS pump motor.
DTC No.DTC Detecting ConditionTrouble Area
13
Conditions 1 and 2 continued for 0.2 sec. or more:
1. ABS control (motor) relay terminal (MR) voltage: Battery
positive voltage
2. ABS control (motor) relay monitor terminal (MT) voltage:
0 V
ABS control (motor) relay
Open or short in ABS control (motor) relay circuit
ECU
14
Conditions 1 and 2 continued for 2.5 sec. or more:
1. ABS control (motor) relay terminal (MR) voltage: 0 V
2. ABS control (motor) relay monitor terminal (MT) voltage:
Battery positive voltageABS control (motor) relay
B+ short in ABS control (motor) relay circuit
ECU
Fail safe function:
If trouble occurs in the ABS control (motor) relay circuit, the ECU cuts off current to the ABS control (solenoid)
relay and prohibits ABS control.
WIRING DIAGRAM
DI106−03

Downloaded from www.Manualslib.com manuals search engine BE6653
R14667F15004
A6 LOCK
(−) (+)
1
R13728
8 ABS Control
Relay
ABS
Actuator
ABS ECU
2 2
55 A6
A4
A16
A4
A4
A4
2
DI−336
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminal A6 − 1 of ABS control relay and body ground.
PREPARATION:
Disconnect the ABS control relay connector.
CHECK:
Measure voltage between terminal A6 − 1 of ABS control relay
harness side connector and body ground.
OK:
Voltage: 10 − 14 V
NG Check and repair harness or connector.
OK
2 Check continuity between terminals A6 − 2 and A4 − 2, A4 − 2 and A4 − 5, A4 − 5
and A16 − 12.
PREPARATION:
Disconnect the 2 connectors from the ABS actuator.
CHECK:
Check continuity between terminals A6 − 2 and A4 − 2, A4 − 2
and A4 − 5, A4 − 5 and A16 − 8.
OK:
Continuity
HINT:.
There is a resistance of 26 ∼ 40 Ω between terminals A4 − 2 and
A4 − 5
NG Repair or replace harness or ABS actuator.
OK

Downloaded from www.Manualslib.com manuals search engine W00572
Open
Continuity
1 2
3
4A6
A5
W00573
(+) (−) Continuity
1 2
3
4A6
A5
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−337
1996 TOYOTA T100 (RM449U)
3 Check ABS control (motor) relay.
CHECK:
Check continuity between each terminal of ABS control (motor)
relay.
OK:
Terminals A6 − 3 and A6 − 4Continuity (Reference value 62 Ω)
Terminals A6 − 1 and A6 − 2Open
CHECK:
(a) Apply battery positive voltage between terminals A6 − 3
and A6 − 4.
(b) Check continuity between terminals of ABS control relay.
OK:
Terminals A6 − 1 and A6 − 2Continuity
NG Replace ABS control relay.
OK
4 Check for open and short in harness and connector between ABS control relay
and ABS ECU (See page IN−26).
NG Repair or replace harness or connector.
OK
If same code is still output after DTC is deleted, check contact condition of each connection.
If connections are normal, ECU may be defective.

Downloaded from www.Manualslib.com manuals search engine DI−338
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 21, 22, 23 ABS Actuator Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
21
Conditions 1 through 3 continue for 0.02 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage of ABS ECU terminal AST: Battery positive
voltage
3. When power transistor of ECU is ON, voltage of terminal
SFRR or SFRH is 0 V or battery positive voltage.
ABS actuator
Open or short in SFRR or SFRH circuit
ECU
22
Conditions 1 through 3 continue for 0.02 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage of ABS ECU terminal AST: Battery positive
voltage
3. When power transistor of ECU is ON, voltage of terminal
SFLR or SFLH is 0 V or battery positive voltage.
ABS actuator
Open or short in SFLR or SFLH circuit
ECU
23
Conditions 1 through 3 continue for 0.02 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage of ABS ECU terminal AST: Battery positive
voltage
3. When power transistor of ECU is ON, voltage of terminal
SRR or SRH is 0 V or battery positive voltage.
ABS actuator
Open or short in SRR or SRH circuit
ECU
Fail safe function:
If trouble occurs in the actuator solenoid circuit, the ECU cuts off current to the ABS control (solenoid) relay
and prohibits ABS control.
DI10A−03

Downloaded from www.Manualslib.com manuals search engine F14590
ABS Contorl Relay
ABS ECU Motor
Relay
Solenoid
Relay
A15
A15
A16
A16
A15 A6
A6
A5
A15 A3
A3
A3
A3
A3
A3G−Y
G−R
G−W
G
L−Y
ABS ECU 4
3
1
A6
1
A5
2
A5
6 W
W
EA1
10
EA1
5 W
W
W−B
DLC1
ID
A4
1
W−B
ABS Actuator
A6A5
A4 A4
W−R
LG102
ABS
9
2 R/B
No.2
W
R−L
Battery2
25
4ABS ECU
L−RSFLR
SFLH
SFRR
SFRH
SRR
SRH 6
3 4
5 112
13
2
1
25
26
2
F14588
1 2
4
5 3
4 A3
A4
6
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−339
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check ABS actuator solenoid.
PREPARATION:
Disconnect the 2 connectors from the ABS actuator.
CHECK:
Check continuity between terminals A4 − 4 and A3 − 1, 2, 3, 4,
5, 6 of ABS actuator connector.
OK:
Continuity
HINT:
Resistance of each solenoid coil
SFRH, SFLH, SRH: 5.0 Ω
SFRR, SFLR, SRR: 2.2 Ω
NG Replace ABS actuator.
OK

Downloaded from www.Manualslib.com manuals search engine BR3583
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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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

Downloaded from www.Manualslib.com manuals search engine F14589
ABS Contorl Relay
ABS ActuatorABS ECU
R/B
No.2Motor
Relay
Solenoid
Relay
ABS ECUDLC1
ABS
Battery
A16
A16
A16
A16
A16 A6
A6
A5
A4
A4 A4
A4 A5
A6 A6
A5
A5
A4 EA1
EA1
ID
MR
R−
SR
AST
MT R−B
G−B
R−W
R−Y
R−L W−B
W−B W
W W
W
W
R−L
W−R
LG
4
15
5 4
3
1
3
5 1
2
6
1 5 10
10 2
2
92
25
4
11
8
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−353
1996 TOYOTA T100 (RM449U)
DTC 51 ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
51Pump motor is not operating normally during initial check.ABS pump motor
Fail safe function:
If trouble occurs in the ABS pump motor, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
WIRING DIAGRAM
DI10Q−03