1996 TOYOTA LAND CRUISER Terminal

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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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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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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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.
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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
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R14139
A6A7
Continuity
Continuity Open
1
2
5
6
3
R14140
A7
A6
(−)
(+)
Continuity
Open
1
2
5
6
3
R14144
(+) (−)4
5
A7A6
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−231
1996 LAND CRUISER (RM451U)
2 Check ABS control relay.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connectors from the control relay.
CHECK:
Check the continuity between each terminal of the ABS control
relay.
OK:
Terminals A7 −1 and A6− 3Continuity
(Reference value 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 relay.
OK:
Terminals A7 −5 and A7− 6Open
Terminals A7 −2 and A7− 5Continuity
CHECK:
Connect the  test lead to terminal A7−4 and the  test lead
to terminal A7−5. Check continuity between the terminals.
OK:
Continuity
If there is no continuity, connect the  test lead to terminal A7−4
and the  lead to terminal A7 −5. Recheck continuity between
terminals.
NG Replace ABS control relay.
OK
Check for open in harness and connector be-
tween DLC1 and ABS control relay and body
ground (See page IN−28 ).
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W02200
BR−BE1Tc
3 11
DLC1
B−YIH1 ABS ECU
Tc 12 VA13
5
EC
B−Y
11
F00007
Tc
DLC1
E1
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−233
1996 LAND CRUISER (RM451U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and E1 of the DLC1 causes the ECU to display the DTC by flashing the ABS warni\
ng
light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Tc and E
1 of the
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
DI5ML−02
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W01184
BR−BGR−R
31 6 15
13
Ts
Ts
DLC1 ABS ECU
12 V
E1IH1 A12
EC
GR−R
F00007
Ts
DLC1
E1
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
DI−235
1996 LAND CRUISER (RM451U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detecte\
d 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 the voltage between terminals Ts and E
1 of the
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
DI5MN−02
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Version 1.11 - 03/16/2010