TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine F00359
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 BE6653R15782F00460
ON
GND
IG1 (−)
GND(+)
BE6653
R15783F00004
LOCK
GND
GND
(+) (−)
DI−348
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check battery positive voltage.
OK:
Voltage: 10 − 14 V
NG Check and repair charging system.
OK
2 Check voltage between terminals IG1 and GND of ABS ECU connector.
PREPARATION:
Remove the ABS ECU with the connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG1 and GND of ABS
ECU connector.
OK:
Voltage: 10 − 14 V
OK Check and replace ABS ECU.
NG
3 Check continuity between terminals GND of ABS ECU connector and body
ground.
CHECK:
Measure resistance between terminals GND of ABS ECU con-
nector and body ground.
OK:
Resistance: 1 Ω or less
NG Repair or replace harness or connector.
OK

Downloaded from www.Manualslib.com manuals search engine A00777
J/B No.1
Fuse Box
ECU−IG Fuse
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−349
1996 TOYOTA T100 (RM449U)
4 Check ECU−IG fuse.
PREPARATION:
Remove the ECU−IG fuse from the J/B No.1.
CHECK:
Check continuity of ECU−IG fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to ECU−IG fuse (See attached wiring
diagram).
OK
Check for open in harness and connector between ABS ECU and battery (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine DI−350
− 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

Downloaded from www.Manualslib.com manuals search engine BE6653R15784F00459
ON
GS2
GST (−)
GS1 (+)
F00012
IG SW
GSTON
OFF
12 V
0 V1.5 sec.
0.5 sec.
DI−352
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between Deceleration sen-
sor and ECU (See page IN−26).
NG Repair or replace harness or connector.
OK
2 Check voltage between terminals GS1, GS2, GST of ABS ECU and body ground.
PREPARATION:
(a) Remove the ABS ECU with the connectors still con-
nected.
(b) Disconnect the deceleration sensor connector.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals GS1, GS2, GST of ECU
and Body ground.
OK:
Voltage:
GS1, GS2: about 5 V
GST: As shown below
NG Check and replace ABS ECU.
OK
Check and replace deceleration sensor.

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

Downloaded from www.Manualslib.com manuals search engine F14591
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

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
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

Downloaded from www.Manualslib.com manuals search engine R14139
A6A5 Continuity
ContinuityOpen
5 6 31 2
R14140
A5
A6
(−)
(+)Continuity
Open
1 2
5
6
3
R14144
A5A6
(+) (−)
4 5
DI−356
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
2 Check ABS control relay.
PREPARATION:
Disconnect the connectors from the control relay.
CHECK:
Check continuity between each terminal of ABS control 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
relay.
OK:
Terminals A5 − 5 and A5 − 6Open
Terminals A5 − 2 and A5 − 5Continuity
CHECK:
Connect the  test lead to terminal A5 − 4 and the  test lead
to terminal A5 − 5. Check continuity between terminals.
OK:
Continuity
If there is no continuity, connect the  test lead to terminal A5
− 4 and the  lead to terminal A5 − 5. Recheck continuity be-
tween terminals.
NG Replace ABS control relay.
OK
Check for open in harness and connector between DLC1, ABS control relay and body ground
(See page IN−26).