1996 TOYOTA T100 warning light

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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 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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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

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ABS Contorl
Relay
ABS
ActuatorABS ECU Motor
Relay
Solenoid
Relay Battery
A5
A5EA1
ID
W−B W
W WW
EA1
A5A5
A5 A6
A6
A6
A4ABS
Actuator
ABS ECUABS ECUIG Switch
Integration
Relay
ABS
Warning
Light I15C10
C10
A16
1A
IE1
IE1B−YB−Y
LG
B−RB−R
B−RB−R
B−O
23 22 Short Pin 10
1
2
6
5
44 1 4
32
29
9
4
8
GAUGE
12
WA
5
24 DI−354
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At
this time, the ECU records a DTC in memory.
After removing the short pin of the DLC1, connect terminals Tc and E
1 of the DLC1 to make the ABS warning
light blink and output the DTC.
WIRING DIAGRAM
DI10S−03

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DI−355
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
Troubleshooting in accordance with the chart below for each trouble symptom.
ABS warning light does not light upGo to step 1
ABS warning light remains onGo to step 3
1 Check ABS warning light.
See Combination Meter Troubleshooting on page BE−2.
NG Repair bulb or combination meter assembly.
OK

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DI−357
1996 TOYOTA T100 (RM449U)
3 Is DTC output?
Check DTC on page DI−321.
YES Repair circuit indicated by code output.
NO
4 Does ABS warning light go off if short pin is removed?
NO Check for short in harness and connector be-
tween warning light, DLC1 and ECU (See page
IN−26).
YES
5 Check ABS control relay (See step 2).
NG Replace ABS control relay.
OK
Check for short in harness and connector between DLC1 and ABS control relay (See page
IN−26).

Downloaded from www.Manualslib.com manuals search engine F00363
BRABS ECU
DLC1
Y−BY−B
EBIE1 A15
E1
3116
20
TcTc
AB0119S08097F00445
ON
E
1
Tc(−)
(+)
DI−358
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and E1 of the DLC1 causes the ECU to display the DTC by flashing the ABS warning
light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals Tc and E
1 of DLC1.
OK:
Voltage: 10 − 14 V
OK If ABS warning light does not blink even after Tc
and E
1 are connected, ECU may be defective.
NG
DI10U−03

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BRABS ECU
DLC1
R−YR−Y
EBIE1 A15
E1
3161
6
TsTs
AB0119S08096F00446
ON
E
1
Ts(−)
(+)
DI−360
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with
the DTC check.
Connecting terminals Ts and E
1 of the DLC1 in the engine compartment starts the check.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals Ts and E
1 of DLC1.
OK:
Voltage: 10 − 14 V
OK If ABS warning light does not blink even after Ts
and E
1 are connected, ECU may be defective.
NG
DI10W−03