light TOYOTA LAND CRUISER 1996 J80 Workshop Manual

DI5LZ−03
DI−200
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still o\
ccurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the releva\
nt troubleshooting page.
SymptomsSuspected AreaSee page
ABS does not operate
Only when 1 − 4 are all normal and the problem is still occurring, replace the ABS
ECU
2. Check the DTC reconfirming that the normal code is output
3. IG power source circuit
4. Speed sensor circuit
5. Check the ABS actuator with a checker
If abnormal, check the hydraulic circuit for leakage (See page DI−237)
DI−190
DI−215
DI−210
BR−53
ABS does not operate effi-
ciently
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−237)
DI−190
DI−210
DI−228
BR−53
ABS warning light abnormal1. ABS warning light circuit
2. ABS ECUDI−230 −
DTC check cannot be done
Only when 1 and 2 are all normal and the problem is still occurring, rep\
lace the
ABS ECU
1. ABS warning light circuit
2. Tc terminal circuit
DI−230
DI−233
Speed sensor signal check
cannot be done1. Ts terminal circuit
2. ABS ECUDI−235−
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

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
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

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
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

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
Brought to you by BirfMark
Brought to you by BirfMark
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.
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

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
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−227
1996 LAND CRUISER (RM451U)
5 Check ABS warning light.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the ABS ECU.
(c) Turn the ignition switch ON.
CHECK:
Check the ABS warning light goes off.
OK Check and replace ABS ECU.
NG
Check for short in harness and connector between combination meter and ABS EC\
U, and com-
bination meter and DLC1 (See page IN−28).
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

W02198
1
STOP
G−O2
G−W
G−W
G−W
W−B 6
3
Stop Light
A12STP ABS ECU
ID2
Stop light Switch
High Mounted
Stop Light 2
BG
G−W
G−W
G−W
BQ1
2
DI−228
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
This stop light switch senses whether the brake pedal is depressed or releas\
ed, and sends the signal to the
ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is released.
NG Repair stop light circuit (See page BE−24).
OK
DI5MG−02
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

BE6653
R14209
F15325
(−) (+)STP
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−229
1996 LAND CRUISER (RM451U)
2 Check voltage between terminal STP of ABS ECU and body ground.
PREPARATION:
Remove the ABS ECU with connectors still connected.
CHECK:
Measure the voltage between terminal STP of the ABS ECU
and body ground when the brake pedal is depressed.
OK:
Voltage: 8 − 14 V
OK Proceed to next circuit inspection shown on problem symptoms table (See page DI−200 ).
NG
3 Check for open in harness and connector between ABS ECU and stop light switch (See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

W02199
BatteryJunction
Connector
ID
W−B
B−W
ABS Control Relay
1 4
2
6 3
1
4
Motor
Relay
Solenoid
Relay
ABS ECU
ABS ECU
ABS Actuator 4
5
A7
A6
A6 A6
A4 R−L
R−L
DLC1
Short Pin
B−W
IH1
A12
ABS ECU
W
13
C10
GAUGE
2223 ABS
Warning
Light
A
A
J1
C10IH1
20
A7
A7A7
A7
EA3
EA3
2
1 B−W
B−W
B−L OO
O
Y
54
3
23 OY
DI−230
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
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
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
DI5MJ−03
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010