1996 TOYOTA LAND CRUISER brake system

W02196
BF
6
ECU−IG Y
Junction
Connector ABS ECU
W−B Y−B
4
2 3
1
Deceleration
Sensor
A12
ABS ECU
GS1
GS2 GST
A22
3
B−W
Y
B−W
B−W
A22A22 A22
A22
A12
A12
12
10
12 13 14
15
Y−RY−R
Y−B
B
B
B 12 V
12 V
ID3
ID3
ID3
ID2
3
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−219
1996 LAND CRUISER (RM451U)
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 the 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, the 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
WIRING DIAGRAM
DI5M8−02
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BE6653
W02205 F00037
ON
(−) (+) GS2
GS1 GST
F00012
IG SW
GST
ON
OFF
5 V
0 V 1.5 sec.
0.5 sec.
DI−220
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between Deceleration sen-
sor and ECU (See page IN−28 ).
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 connectors still connected.
(b) Disconnect the deceleration sensor connector.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals GS1, GS2, GST of the
ECU and Body ground.
OK:
Voltage:
GS1, GS2: 4 − 14 V
GST: As shown below
NG Check and replace ABS ECU.
OK
Check and replace deceleration sensor.
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W02197
Ignition
Switch
Battery
AM1
F61
B−L 2 2
3
4
W
2 12
AM1R/B No. 2
2
BB
EA2
6
B−Y
42
GAUGEY A
A
J1
Junction
Connector
CENTER DIFF. LOCK
Indicator Light Y
C10
P−B
P−B
P−B
C11
5
A1319
EXI
CENTER
DIFF. LOCK
DETECTION
Switch ABS ECU
2
1
3
R/B No. 2
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−221
1996 LAND CRUISER (RM451U)
DTC 48 Center Differential Lock Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
48Open or short circuit in center differential lock circuit
Center differential is lockingCenter differential lock
 Center differential lock circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check the center differential is free (Transfer is in H position).
NG Repair the center differential lock system.
OK
DI5M9−02
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DI−222
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
2 Is DTC output?
Check DTC on page DI−190 .
NO Normal.
YES
3 Check that CENTER DIFF. LOCK indicator light does not go off.
NO Go to step 6.
YES
4 Check that bulb for CENTER DIFF. LOCK indicator light is not burnt out.
YES Replace indicator light.
NO
5 Check for open in harness and connector between battery and CENTER DIFF. LOCK indicator light, and CENTER DIFF. LOCK indicator light and ABS ECU (See
page IN−28 ).
NG Repair or replace harness or connector.
OK
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Version 1.11 - 03/16/2010

−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−223
1996 LAND CRUISER (RM451U)
6 Check for short in harness and connector between CENTER DIFF. LOCK indica-
tor light and ABS ECU (See page IN−28).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.
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Version 1.11 - 03/16/2010

W02192
22 1
4
ABS
R/B
No. 2
W
B−R
W−B
ID
1 1
1
2
2
2
3
64
4 3
6
3
511
18
G
G−B
G−Y
DLC1 ABS ECU
MR
R−
SR
AST MT
L−Y
L−W
ABS Actuator ABS Control Relay
Motor
Relay
Solenoid
Relay
ABS ECU
A6A4
A13A5
F6
Battery
B−L
2
2
12 B−W
B−W
B−W
EA312
5
A5
A4
A4 A6
A6
A6
A7
A7
A7 A7A13 A13
A13 A13
24
23
B−L
EA312 V 12 V
B−W
AM1
W−B W−B
R/B
No. 2 B−W
DI−224
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
DTC 51 ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
51Pump motor is not operating normally during initial checkABS 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
DI5MB−02
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Version 1.11 - 03/16/2010

W02195
ECU−IG
Ignition Switch
GNDABS ECU
B−W
J6
Junction
Connector
W
B−L
6
EA2
AM1
IE
3 4
Deceleration
Sensor
2
2
2
2 2
2
2
A13
A13 A13
Battery
AM1
GND
B−W
B−Y
B
B
BB
B
BR BR
BR
F6 1
1
13
+B
12
15
4 R/B No. 2
R/B No. 2
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−225
1996 LAND CRUISER (RM451U)
DTC Always ON Malfunction in ECU
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the CPU, and the actuator.
DTC No.DTC Detecting ConditionTrouble Area
Alway ONVoltage of ECU terminal +B remains at more than 17 V or
below 9.5 V
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
DI5ME−03
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DI−226
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI−190 .
YES Repair circuit indicated by code output.
NO
2 Is normal code displayed?
YES Check ABS solenoid relay. Check for short in harness and connector between ABS solenoid
relay and DLC1 (See page IN−28 ).
NO
3 Is ABS warning light go off?
YES Check for open or short in harness and connec-
tor between ECU−IG fuse and ECU (See page
IN−28 ).
NO
4 Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 − 16 V NG Check and repair charging system.
OK
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Version 1.11 - 03/16/2010