1996 TOYOTA T100 engine

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R00463
A15A16
1 2 3 4 5 6 7 8
9 10 11 12 13 1 2 3 4 5 6 7 8
14 15 16 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−329
1996 TOYOTA T100 (RM449U)
TERMINALS OF ECU
Symbols (Terminals No.)STD Voltage (V)Condition
BAT (A15 − 22) − GND (A15 − 11, 24)10 − 14Always
IG1 (A15 − 10) − GND (A15 − 11, 24)10 − 14IG switch ON
SR (A16 − 5) − R− (A16 − 15)9 − 14IG switch ON, ABS warning light OFF
MR (A16 − 4) − R− (A16 − 15)Below 1.0IG switch ON
SFRH (A16 − 1) − GND (A15 − 11, 24)10 − 14IG switch ON, ABS warning light OFF
SFRR (A16 − 2) − GND (A15 −11, 24)10 − 14IG switch ON, ABS warning light OFF
SFLH (A15 − 13) − GND (A15 − 11, 24)10 − 14IG switch ON, ABS warning light OFF
SFLR (A15 − 12) − GND (A15 − 11, 24)10 − 14IG switch ON, ABS warning light OFF
SRR (A15 − 25) − GND (A15 − 11, 24)10 − 14IG switch ON, ABS warning light OFF
SRH (A15 − 26) − GND (A15 − 11, 24)10 − 14IG switch ON, ABS warning light OFF
AST (A16 − 11) − GND (A15 − 11, 24)10 − 14IG switch ON, ABS warning light OFF
WA (A16 − 12) − GND (A15 − 11, 24)Below 2.0IG switch ON, ABS warning light ON
10 − 14IG switch ON, ABS warning light OFF
STP (A15 − 21) − GND (A15 − 11, 24)Below 1.5Stop light switch OFF
8 − 14Stop light switch ON
Tc (A15 − 20) − GND (A15 − 11, 24)10 − 14IG switch ON
Ts (A15 − 6) − GND (A15 − 11, 24)10 − 14IG switch ON
FR+ (A16 − 7) − FR− (A16 − 5)AC generationIG switch ON
Slowly turn right front wheel
FL+ (A16 − 14) − FL− (A16 − 13)AC generationIG switch ON
Slowly turn left front wheel
RR+ (A15 − 15) − RR− (A15 − 16)AC generationIG switch ON
Slowly turn right rear wheel
RL+ (A15 − 1) − RL− (A15 − 2)AC generationIG switch ON
Slowly turn left rear wheel
GS1* (A15 − 19) − GND (A15 − 11, 24)about 2 or 4IG switch ON
GS2* (A15 − 7) − GND (A15 − 11, 24)about 2IG switch ON
EXI* (A15 − 8) − GND (A15 − 11, 24)Below 2.0IG switch ON, transfer is in L4 or H4 position
10 − 14IG switch ON, transfer is in H4 position
EXI3 (A15 − 9) − GND (A15 − 11, 24)Below 2.0IG switch ON, transfer is in L4 position
10 − 14IG switch ON, transfer is in a position other than L4
MT (A16 − 8) − GND (A15 − 11, 24)Below 1.5IG switch ON
FSS (A16 − 16) − GND (A15 − 11, 24)ContinuityIG switch OFF
RSS (A15 − 23) − GND (A15 − 11, 24)ContinuityIG switch OFF
PKB (A15 − 9) − GND (A15 − 11, 24)Below 1.5IG switch ON, PKB lever pulled
10 − 14IG switch ON, PKB lever released

Downloaded from www.Manualslib.com manuals search engine DI−330
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
*: 4WD Vehicle

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

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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.

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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

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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