1996 TOYOTA T100 check engine

Downloaded from www.Manualslib.com manuals search engine W00572
Open
Continuity
1 2
3
4A6
A5
W00573
(+) (−) Continuity
1 2
3
4A6
A5
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−337
1996 TOYOTA T100 (RM449U)
3 Check ABS control (motor) relay.
CHECK:
Check continuity between each terminal of ABS control (motor)
relay.
OK:
Terminals A6 − 3 and A6 − 4Continuity (Reference value 62 Ω)
Terminals A6 − 1 and A6 − 2Open
CHECK:
(a) Apply battery positive voltage between terminals A6 − 3
and A6 − 4.
(b) Check continuity between terminals of ABS control relay.
OK:
Terminals A6 − 1 and A6 − 2Continuity
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 F14590
ABS Contorl Relay
ABS ECU Motor
Relay
Solenoid
Relay
A15
A15
A16
A16
A15 A6
A6
A5
A15 A3
A3
A3
A3
A3
A3G−Y
G−R
G−W
G
L−Y
ABS ECU 4
3
1
A6
1
A5
2
A5
6 W
W
EA1
10
EA1
5 W
W
W−B
DLC1
ID
A4
1
W−B
ABS Actuator
A6A5
A4 A4
W−R
LG102
ABS
9
2 R/B
No.2
W
R−L
Battery2
25
4ABS ECU
L−RSFLR
SFLH
SFRR
SFRH
SRR
SRH 6
3 4
5 112
13
2
1
25
26
2
F14588
1 2
4
5 3
4 A3
A4
6
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−339
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check ABS actuator solenoid.
PREPARATION:
Disconnect the 2 connectors from the ABS actuator.
CHECK:
Check continuity between terminals A4 − 4 and A3 − 1, 2, 3, 4,
5, 6 of ABS actuator connector.
OK:
Continuity
HINT:
Resistance of each solenoid coil
SFRH, SFLH, SRH: 5.0 Ω
SFRR, SFLR, SRR: 2.2 Ω
NG Replace ABS actuator.
OK

Downloaded from www.Manualslib.com manuals search engine DI−340
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
2 Check for open and short in harness and connector between ABS ECU and
actuator (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 connector are normal, ECU may be defective.

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BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
−VHigh Speed
Low Speed
CoilNS
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−341
1996 TOYOTA T100 (RM449U)
DTC 31 − 36 Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS system. The front and rear rotors each have 48 serra-
tions.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.

DTC No.DTC Detecting ConditionTrouble Area
31, 32, 33, 34
Detection of any of conditions 1 through 3:
1. At vehicle speed of 10 km/h (6 mph) or more, pulses are
not input for 15 sec.
2. Momentary interruption of speed sensor signal occurs at
least 7 times in time between switching the ignition
switch ON and switching it OFF.
3. Abnormal fluctuation of speed sensor signals with ve-
hicle speed 20 km/h (12 mph) or more.
4. An open is detected in speed sensor circuit for 0.6 sec.
Right front, left front, right rear, left rear speed sensor
Open or short in each speed sensor circuit
ECU
35
Speed sensor signal is not input for about 1 sec. while left
front and right rear speed sensor signals are being
checked with IG switch ON.Open in left front or right rear speed sensor circuit
ECU
36
Speed sensor signal is not input for about 1 sec. while right
front and left rear speed sensor signals are being checked
with IG switch ON.Open in right front or left rear speed sensor circuit
ECU
HINT:
DTC No. 31 is for the right front speed sensor.
DTC No. 32 is for the left front speed sensor.
DTC No. 33 is for the right rear speed sensor.
DTC No. 34 is for the left rear speed sensor.
Fail safe function:
If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
DI10D−02

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Front
1
2
R15781
Rear
2
1
34
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−343
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.6 − 1.8 kΩ
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 MΩ or higher
Rear
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2, 3 and 4 of
speed sensor connector.
OK:
Resistance: 0.6 − 2.05 kΩ
CHECK:
Measure resistance between terminals 1 and 2, 3 and 4 of
speed sensor connector and body ground.
OK:
Resistance: 1 MΩ or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI−321).
OK
2 Check for open and short in harness and connector between each speed sensor
and ECU (See page IN−26).
NG Repair or replace harness or connector.
OK

Downloaded from www.Manualslib.com manuals search engine R07880
R07772
BR3795
OK
NG
DI−344
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
3 Check sensor rotor and sensor installation.
Front
PREPARATION:
Remove the axle hub (See page SA−16 or SA−23).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
Rear
PREPARATION:
Remove the axle shaft (See page SA−131).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and steering
knuckle or rear axle carrier.
NG Replace speed sensor or rotor.
NOTICE:
Check the speed sensor signal last (See page DI−321).
OK
Check and repalce ABS ECU.

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