1996 TOYOTA LAND CRUISER Terminal

BE6653R14203 F00001
LOCK
2
6 A7
(+)
(−)
R00888
5
4
2
18
ABS Control
Relay
ABS
Actuator
ABS ECU A7
A4
A5 A5
A4
A13
DI−202
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check voltage between terminals A7−2 and A7−6 of ABS control relay connector.
PREPARATION:
Disconnect the ABS control relay connector.
CHECK:
Measure the voltage between terminals A7 −2 and A7−6 of the
ABS control relay harness side connector.
OK:
Voltage: 10 − 14 V
NG Check and repair harness or connector.
OK
2 Check continuity between terminals A7−5 and A4−4, A4−4 and A5−2, and A5−2 and A13−18.
PREPARATION:
Disconnect the 2 connectors from the ABS actuator.
CHECK:
Check the continuity between terminals A7 −5 and A4−4, A4 −4
and A5−2, and A5−2 and A13−18.
OK:
Continuity
HINT:
There is a resistance of 4 ∼ 6 Ω between terminals A4 −4 and
A5−2.
NG Repair or replace harness or ABS actuator.
OK
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R14139
ContinuityOpen
Continuity
1
2
5
6
3
A6
A7
R14140
(−) (+)
Continuity
Open
36
51
2
A6 A7
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−203
1996 LAND CRUISER (RM451U)
3 Check ABS control (solenoid) relay.
CHECK:
Check the continuity between each terminal of the ABS control
(solenoid) relay.
OK:
Terminals A7 −1 and A6− 3Continuity
(Reference value aprox. 80 Ω)
Terminals A7 −5 and A7− 6Continuity
Terminals A7 −2 and A7− 5Open
CHECK:
(a) Apply battery positive voltage between terminals A7 −1
and A6−3.
(b) Check the continuity between each terminal of the ABS control (solenoid) relay.
OK:
Terminals A7 −5 and A7− 6Open
Terminals A7 −2 and A7− 5Continuity
NG Replace ABS control relay.
OK
4 Check for open and short in harness and connector between ABS control (\
sole- noid) relay and ABS ECU (See page IN−28).
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.
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−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−207
1996 LAND CRUISER (RM451U)
DTC 21, 22, 23 ABS Actuator Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
21
Conditions 1 through 3 continue for 0.05 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage of ABS ECU terminal AST: Battery positive voltage
3. When power transistor of ECU is ON, voltage of terminal SFR is 0 V or battery positive voltage
ABS actuator
 Open or short in SFR circuit
22
Conditions 1 through 3 continue for 0.05 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage of ABS ECU terminal AST: Battery positive volt- age
3. When power transistor of ECU is ON, voltage of terminal SFL is 0 V or battery positive voltage
ABS actuator
 Open or short in SFL circuit
23
Conditions 1 through 3 continue for 0.05 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage of ABS ECU terminal AST: Battery positive voltage
3. When power transistor of ECU is ON, voltage of terminal SRR is 0 V or battery positive voltage
ABS actuator
 Open or short in SRR circuit
Fail safe function:
If trouble occurs in the actuator solenoid circuit, the ECU cuts off current to the ABS control (solenoid) relay
and prohibits ABS control.
DI5M2−02
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W02193
2
2 1
3
ABS
Battery
W
B−W
W−BID
1
W−B 1
1
W−B 2
2
3 5
4
6
3
4
DLC1
ABS Actuator ABS Control Relay
Motor
Relay
Solenoid
Relay
ABS ECULG
L−R ABS ECU
ABS ECU
3
4
1
1
13
26
SFR
SFL
SRR
A6
A4 A5
A13
A7A6
A6 A6
A4 A4
A5
A5
A13
A13
F6
EA3
L
B−W
B−W
2
2
2
2
EA31
A7 A7
A7
B−RBL
4
1
B−L
AM1
Monitor
R/B
No. 2
B−W
B−W
R/B
No. 2
F00026
1
3
LOCK
7
4
A5
A4
4
DI−208
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check ABS actuator solenoid.
PREPARATION:
Disconnect the 2 connectors from the ABS actuator.
CHECK:
Check the continuity between terminals A4 − 4 and A5−1, 3, 4
of the ABS actuator connector.
OK:
Continuity
HINT:
Resistance of each solenoid coil is 0.8 − 1.6 Ω
NG Replace ABS actuator.
OK
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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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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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