brake system TOYOTA LAND CRUISER 1996 J80 Service Manual

W02194
Right Front
Speed SensorLeft Front
Speed Sensor
Right Rear
Speed Sensor
Left Rear
Speed Sensor 2
1 2
2 2
1 1 1
GR
W
R
W
B B
B
W W RR
R
G G
G ABS ECU
Bd1
Bf1
Bg1 Bh1
ID3
BQ2
4 9
10
2
7
1
6
2
A13
A12
FR+
FR- FL+ FL-
RR+ RR-RL+
RL-
16
1 2
Bf1 Bd2
Bd1
Bd2
Bg1 Bh1
Bh1
Bh1
Bh1 BQ2
BQ2
BQ2
BQ2 ID3
ID3
ID3
ID3
L
W
WWW
B FSS
RSS
B
1 1
2
1
2 2
4 1
16
4
4
LLL
BR
BR-B
W-B
3
3 33
Y P
V
Y-G
A13
A13
A13
A13
A12
A12
A12
A12
5
5 11
5 22
9
8
DI-211
-
DIAGNOSTICS ANTI-LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
WIRING DIAGRAM
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W02207W02208W02209
W02210
F00036
Front:
Rear:FL+
FL- FR-
FR+
RL+ RL-
RR+ RR-
-
DIAGNOSTICS ANTI-LOCK BRAKE SYSTEM
DI-212
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front
PREPARATION:
Disconnect speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2, 3 and 4 of
speed sensor connector.
OK:
Resistance: 0.6 - 2.0 k W
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 M W or higher
Rear
PREPARATION:
Disconnect speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.5 - 1.6 k W
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 M W or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-189).
OK
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W04200
Normal Signal WaveformGND
2 ms/Division
1V/Division
DI-213
-
DIAGNOSTICS ANTI-LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
2 Check for open and short in harness and connector between each speed sensor and ECU (See page IN-27).
NG Repair or replace harness or connector.
OK
3 Check speed sensor and rotor serrations.
Reference: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the ABS ECU with connector still connected.
(b) Connect the oscilloscope to the terminals FR+, FL+, RR+ or RL+ and GND of the ABS ECU.
CHECK:
Drive the vehicle at 30 km/h (19 mph), and check the signal wa-
veform.
OK Turn the IG swithch OFF, check and replace ABS ECU.
NG
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R04759
R04775
BR3795
OKNG
-
DIAGNOSTICS ANTI-LOCK BRAKE SYSTEM
DI-214
1996 LAND CRUISER (RM451U)
4 Check sensor rotor and sensor installation.
Front
PREPARATION:
Remove front axle hub and knuckle spindle (See page
SA-8).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip and grease.
OK:
No scratches or foreign objects on the sensor tip and
grease.
Rear
PREPARATION:
Remove the rear brake caliper and disc.
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-189).
OK
Check and replace ABS ECU.
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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−215
1996 LAND CRUISER (RM451U)
DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the CPU and 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
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
DI5M4−02
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BE6653
R14207 F00034
ON
IG1GNDGND
(+)
(−)
BE6653
R14208 F00035
LOCK
GND
GND
DI−216
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
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 connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals IG1 and GND of the 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 the resistance between terminal GND of the ABS ECU
connector and body ground.
OK:
Resistance: 1 Ω or less
NG Repair or replace harness or connector.
OK
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W02206
Fuse BlockECU−IG
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−217
1996 LAND CRUISER (RM451U)
4 Check ECU −IG fuse.
PREPARATION:
Remove the ECU−IG fuse from the Fuse block.
CHECK:
Check the continuity of the 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 be-
tween ABS ECU and battery
(See page
IN−28).
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DI−218
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
DTC 43 Malfunction in Deceleration Sensor
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
43
Either of the 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
INSPECTION PROCEDURE
1 Check deceleration sensor (See page DI−190).
NG Replace deceleration sensor.
OK
2 Check for open or short in harness and connector between sensor and ECU \
(See page IN−28 ).
NG Repair or replace harness and connector.
OK
Check and replace ABS ECU.
DI5M6−02
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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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