1996 TOYOTA T100 check engine

Downloaded from www.Manualslib.com manuals search engine R05599
0.13 sec.
0.13 sec. 3 sec. ON
OFF
R12881
1,100 ± 30 mm
(43.31 ± 1.18 in.)
R12882
830 ± 30 mm
(32.68 ± 1.18 in.)
BR1865
0.13 sec.
0.13 sec. ON
OFF
R05596
0.13 sec. Braking0.13 sec. DI−324
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit (See page DI−354).
(5) Jack up the rear side of the vehicle slowly.
HINT:
When measuring the height, measure at the center of the lower
body of the vehicle.
(6) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor
installation. If the sensor installation is OK, replace the decel-
eration sensor.
(7) Jack down the vehicle slowly.
(8) Jack up the front side of the vehicle slowly, as
shown.
HINT:
When measuring the height, measure at the center of the lower
body of the vehicle.
(9) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor
installation. If the sensor installation is OK, replace the decel-
eration sensor.
(10) Jack down the vehicle slowly.
(c) Check the deceleration sensor operation.
(1) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, lightly depress the brake pedal.
(2) Check that there is no change in the warning light
pattern.
(3) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, and depress the brake pedal
moderately.
(4) Check that the warning light turns on while braking.

Downloaded from www.Manualslib.com manuals search engine R05597
0.13 sec. 0.13 sec.
Braking
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−325
1996 TOYOTA T100 (RM449U)
(5) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, and depress the brake pedal
strongly.
(6) Check that the warning light pattern changes while
braking, as shown.
If the operation is not as specified, inspect the deceleration sen-
sor installation. If the sensor installation is OK, replace the de-
celeration sensor.
(7) Stop the vehicle and turn the ignition switch OFF.
(8) Remove the SST from the terminals of the DLC1.
SST 09843−18020
(d) Check the DTC of the speed sensor function.
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensorRight front speed sensor
Sensor installation
72Low output voltage of left front speed sensorLeft front speed sensor
Sensor installation
73Low output voltage of right rear speed sensorRight rear speed sensor
Sensor installation
74Low output voltage of left rear speed sensorLeft rear speed sensor
Sensor installation
75Abnormal change in output voltage of right front speed
sensorRight front speed sensor rotor
76Abnormal change in output voltage of left front speed
sensorLeft front speed sensor rotor
77Abnormal change in output voltage of right rear speed
sensorRight rear speed sensor rotor
78Abnormal change in output voltage of left rear speed
sensorLeft rear speed sensor rotor
79*Deceleration sensor is faultyDeceleration sensor
Sensor installation
*: 4WD models

Downloaded from www.Manualslib.com manuals search engine DI0ZQ−03
DI−326
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843−18020, connect terminals Tc and E
1, and remove the short pin.
If a malfunction code is displayed during the DTC check, check the circuit listed that the code. For details
of each code, turn to the page referred to under the ”See Page” for respective ”DTC No.” in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI−332)Open circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
Open or short in ABS control (solenoid) relay circuit
ECU
12
(DI−332)Short circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
B+ short in ABS control (solenoid) relay circuit
ECU
13
(DI−335)Open circuit in ABS control (motor) relay circuit
ABS control (motor) relay
Open or short in ABS control (motor) relay circuit
ECU
14
(DI−335)Short circuit in ABS control (motor) relay circuit
ABS control (motor) relay
B+ short in ABS control (motor) relay circuit
ECU
21
(DI−338)Open or short circuit in 2−position solenoid circuit for right front
wheelABS actuator
Open or short in SFRR or SFRH circuit
ECU
22
(DI−338)Open or short circuit in 2−position solenoid circuit for left front
wheelABS actuator
Open or short in SFLR or SFLH circuit
ECU
23
(DI−338)Open or short circuit in 2−position solenoid circuit for rear
wheelABS actuator
Open or short in SRR or SRH circuit
ECU
31
(DI−341)Right front wheel speed sensor signal malfunction
Right front, left front, right rear and left rear speed sensor
Open or short in each speed sensor circuit
ECU
32
(DI−341)Left front wheel speed sensor signal malfunction
33
(DI−341)Right rear wheel speed sensor signal malfunction
34
(DI−341)Left rear wheel speed sensor signal malfunction
35
(DI−341)Open circuit in left front or right rear wheel speed sensor.
36
(DI−341)Open circuit in right front or left rear wheel speed sensor.
37
(DI−345)Neither front speed sensor rotor missing
Front axle hub
Right front, left front speed sensor
Wire harness for sensor system
ECU
37
(DI−346)Some tire is different size from the other tiresTire size
ECU
41
(DI−347)Low battery positive voltage or abnormally high battery
positive voltage
Battery
IC regulator
Open or short in power source circuit
ECU

Downloaded from www.Manualslib.com manuals search engine DI0ZZ−03
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−331
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
SymptomsInspection CircuitSee page
ABS does not operate.
Only when 1. − 4. are all normal and the problem is still occurring, replace the
ABS ECU.
1. Check the DTC reconfirming that the normal code is output.
2. IG power source circuit.
3. Speed sensor circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page DI−xx).
DI−321
DI−347
DI−341
BR−58
ABS does not operate
efficiently.
Only when 1. − 4. are all normal and the problem is still occurring, replace the
ABS ECU.
1. Check the DTC reconfirming that the normal code is output.
2. Speed sensor circuit.
3. Stop light switch circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page DI−362).
DI−321
DI−341
BR−58
ABS warning light
abnormal.1. ABS warning light circuit.
2. ABS ECU.DI−354
DTC check cannot be done.
Only when 1. and 2. are all normal and the problem is still occurring, replace the
ABS ECU.
1. ABS warning light circuit.
2. Tc terminal circuit.
DI−354
DI−358
Speed sensor signal check
cannot be done.1. Ts terminal circuit.
2. ABS ECU.DI−360

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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
DI−332
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
CIRCUIT INSPECTION
DTC 11, 12 ABS Control (Solenoid) Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
11
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. ABS control (solenoid) relay monitor terminal (AST)
voltage: 0V
ABS control (solenoid) relay
Open or short in ABS control (solenoid) relay circuit
ECU
12
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage: 0 V
2. ABS control (solenoid) relay monitor terminal (AST)
voltage: Battery positive voltage
ABS control (solenoid) relay
B+ short in ABS control (solenoid) relay circuit
ECU
Fail safe function:
If trouble in the ABS control (solenoid) relay circuit, the ECU cuts off current to the ABS control (solenoid)
relay and prohibits ABS control.
WIRING DIAGRAM

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 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