Page 617 of 2062
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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
Page 618 of 2062
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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
Page 619 of 2062
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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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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).
Page 621 of 2062
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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).
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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
Page 623 of 2062
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DI−359
1996 TOYOTA T100 (RM449U)
2 Check for open and short in harness and connector between ABS ECU and
DLC1, DLC1 and body ground (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.
Page 624 of 2062
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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