1996 TOYOTA T100 engine

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−345
1996 TOYOTA T100 (RM449U)
DTC 37 Neither Front Speed Sensor Rotor Missing
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
37
With front wheels stationary and rear wheels rotating at
20+ km/h (12+ mph) for 10+ secs, turn ignition switch ON
then OFF 8 times, in succession.Front axle hub
Right front, left front speed sensor
Wire harness for sensor system
ECU
INSPECTION PROCEDURE
1 Check front axle hub (See page SA−15 or SA−22).
NG Replace front axle hub.
OK
2 Check front speed sensor (See page DI−341).
NG Replace front speed sensor.
OK
3 Check for open or short in harness and connector between speed sensor and
ECU (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.
DI10F−01

Downloaded from www.Manualslib.com manuals search engine DI−346
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 37 Tires of Different Size
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
37Driving at more than 30 km/h (19 mph) for more than 60
seconds with 1 or 2 tires of different size.Tire size
ECU
INSPECTION PROCEDURE
1 Check tire size.
NG Replace tires so that all 4 tires are of the same
size.
OK
Check and replace ABS ECU.
DI10H−01

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

Downloaded from www.Manualslib.com manuals search engine F00360
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.