ABS TOYOTA T100 1996 Factory User Guide

Downloaded from www.Manualslib.com manuals search engine R12019
DI0ZM−03
A00778DLC1 E
1Tc
F00006
DLC1Short Pin
R01346
Normal Code
0.25 sec.
0.25 sec. 2 sec.
ON
OFF
ON
OFF0.5 sec.0.5 sec.
Code 11 and 21
4 sec.1.5 sec.
2.5 sec.
Code 11 Code 21
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−321
1996 TOYOTA T100 (RM449U)
PRE−CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator light.
When the ignition switch is turned ON, check that the ABS
warning light goes on for 3 seconds.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting for the ABS warning light circuit (See page DI−354).
(b) Check the DTC.
(1) Using SST, connect terminals Tc and E
1 of the
DLC1.
SST 09843−18020
(2) Disconnect the short pin from the DLC1.
(3) Turn the ignition switch ON.
(4) Read the DTC from the ABS warning light on the
combination meter.
HINT:
If no code appears, inspect the diagnostic circuit or ABS
warning light circuit (See page DI−354 or DI−358).
As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(5) Code are explained in the code table on page
DI−326.
(6) After completing the check, disconnect terminals Tc
and E
1, and turn off the display.
If 2 or more malfunctions are indicated at the same time the low-
est numbered DTC will be displayed 1st.

Downloaded from www.Manualslib.com manuals search engine BR3904
0.13 sec. 0.13 sec.
ON
OFF
BR3893
Malfunction Code (Example Code 72, 76)
7
26
7
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec. 2.5 sec.4 sec.
Repeat
A00778DLC1 E
1
Ts
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−323
1996 TOYOTA T100 (RM449U)
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit (See page DI−354).
(5) Drive vehicle straight forward.
HINT:
Drive vehicle faster than 45 km/h (28 mph) for several seconds.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc and E
1 of the
DLC1.
SST 09843−18020
(8) Read the number of blinks of the ABS warning light.
HINT:
See the list of DTC on page DI−326.
If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).
If 2 or more malfunction are indicated at the same time,
the lowest numbered code will be displayed 1st.
(9) After doing the check, disconnect terminals Ts and
E
1, Tc and E1 of the DLC1, and ignition switch
turned OFF.
(b) Check the deceleration sensor detection point.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E
1 of the
DLC1.
SST 09843−18020
(3) Start the engine.

Downloaded from www.Manualslib.com manuals search engine R05599
0.13 sec.
0.13 sec. 3 sec. ON
OFF
R12881
1,100 ± 30 mm
(43.31 ± 1.18 in.)
R12882
830 ± 30 mm
(32.68 ± 1.18 in.)
BR1865
0.13 sec.
0.13 sec. ON
OFF
R05596
0.13 sec. Braking0.13 sec. DI−324
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit (See page DI−354).
(5) Jack up the rear side of the vehicle slowly.
HINT:
When measuring the height, measure at the center of the lower
body of the vehicle.
(6) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor
installation. If the sensor installation is OK, replace the decel-
eration sensor.
(7) Jack down the vehicle slowly.
(8) Jack up the front side of the vehicle slowly, as
shown.
HINT:
When measuring the height, measure at the center of the lower
body of the vehicle.
(9) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor
installation. If the sensor installation is OK, replace the decel-
eration sensor.
(10) Jack down the vehicle slowly.
(c) Check the deceleration sensor operation.
(1) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, lightly depress the brake pedal.
(2) Check that there is no change in the warning light
pattern.
(3) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, and depress the brake pedal
moderately.
(4) Check that the warning light turns on while braking.

Downloaded from www.Manualslib.com manuals search engine DI0ZQ−03
DI−326
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843−18020, connect terminals Tc and E
1, and remove the short pin.
If a malfunction code is displayed during the DTC check, check the circuit listed that the code. For details
of each code, turn to the page referred to under the ”See Page” for respective ”DTC No.” in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI−332)Open circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
Open or short in ABS control (solenoid) relay circuit
ECU
12
(DI−332)Short circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
B+ short in ABS control (solenoid) relay circuit
ECU
13
(DI−335)Open circuit in ABS control (motor) relay circuit
ABS control (motor) relay
Open or short in ABS control (motor) relay circuit
ECU
14
(DI−335)Short circuit in ABS control (motor) relay circuit
ABS control (motor) relay
B+ short in ABS control (motor) relay circuit
ECU
21
(DI−338)Open or short circuit in 2−position solenoid circuit for right front
wheelABS actuator
Open or short in SFRR or SFRH circuit
ECU
22
(DI−338)Open or short circuit in 2−position solenoid circuit for left front
wheelABS actuator
Open or short in SFLR or SFLH circuit
ECU
23
(DI−338)Open or short circuit in 2−position solenoid circuit for rear
wheelABS actuator
Open or short in SRR or SRH circuit
ECU
31
(DI−341)Right front wheel speed sensor signal malfunction
Right front, left front, right rear and left rear speed sensor
Open or short in each speed sensor circuit
ECU
32
(DI−341)Left front wheel speed sensor signal malfunction
33
(DI−341)Right rear wheel speed sensor signal malfunction
34
(DI−341)Left rear wheel speed sensor signal malfunction
35
(DI−341)Open circuit in left front or right rear wheel speed sensor.
36
(DI−341)Open circuit in right front or left rear wheel speed sensor.
37
(DI−345)Neither front speed sensor rotor missing
Front axle hub
Right front, left front speed sensor
Wire harness for sensor system
ECU
37
(DI−346)Some tire is different size from the other tiresTire size
ECU
41
(DI−347)Low battery positive voltage or abnormally high battery
positive voltage
Battery
IC regulator
Open or short in power source circuit
ECU

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−327
1996 TOYOTA T100 (RM449U) 43*
(DI−350)
Malfunction in deceleration sensor
Deceleration sensor
Wire harness for deceleration sensor system
ECU
44*
(DI−351)Open or short in deceleration sensor circuit
Deceleration sensor
Open or short in deceleration sensor circuit
ECU
51
(DI−353)Pump motor is locked
Open in pump motor groundABS pump motor
Always
ONMalfunction in ECUECU
*: 4WD models

Downloaded from www.Manualslib.com manuals search engine DI7HH−02
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

Downloaded from www.Manualslib.com manuals search engine DI103−03
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

Downloaded from www.Manualslib.com manuals search engine BE6653
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.