1986 TOYOTA LAND CRUISER ignition

F02861
LOCKON
PH
PHG
DI-582- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
775 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4 Check pressure switch (PH).
In case of using the hand-held tester:
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the DATA LIST mode on the hand-held tester.
CHECK:
Depress the brake pedal more than 40 times with the ignition switch OFF, then turn the ignition switch ON
and check the pressure switch (PH) condition.
HINT:
When pressure in the power supply system is released, reaction force becomes light and stroke becomes
longer.
OK:
ºOFFº turns to ºONº.
HINT:
OFF: Low pressure
ON: High pressure
In case of not using the hand-held tester:
PREPARATION:
(a) Disconnect the connector (5P) from the hydraulic brake
booster.
(b)
With the ignition switch OFF, depress the brake pedal more than
40 times to decrease the accumulator pressure.
HINT:
When pressure in the power supply system is released, reac-
tion force becomes light and stroke becomes longer.
CHECK:
Measure resistance between terminals PH and PHG of the hy-
draulic brake booster connector.
OK:
Resistance: 1.0 kW
PREPARATION:
(a) Connect the connector (5P) to the hydraulic brake boost-
er.
(b) Disconnect the connector (5P) after the ignition switch is
turned ON and the pump motor is stopped.
CHECK:
Measure resistance between terminals PH and PHG of the hy-
draulic brake booster connector.
OK:
Resistance: 0 W
HINT:
After inspection, connect the connector and clear the DTC (See
page DI-505).
NG Replace hydraulic brake booster assembly.

F02863
LOCK
ONPL
PLG
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-583
776 Author
: Date
:
2004 LAND CRUISER (RM1071U)
OK
5 Check pressure switch (PL).
In case of using hand-held tester:
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the DATA LIST mode on the hand-held tester.
CHECK:
Depress the brake pedal more than 40 times with the ignition switch OFF, then turn the ignition switch ON
and check the pressure switch (PL) condition.
HINT:
When pressure in the power supply system is released, reaction force becomes light and stroke becomes
longer.
OK:
ºOFFº turns to ºONº.
HINT:
OFF: Low pressure
ON: High pressure
In case of not using hand-held tester:
PREPARATION:
(a) Disconnect the connector (8P) from the hydraulic brake
booster.
(b) With the ignition switch OFF, depress the brake pedal
more than 40 times to decrease the accumulator pres-
sure.
HINT:
When pressure in the power supply system is released, reac-
tion force becomes light and stroke becomes longer.
CHECK:
Measure resistance between terminals PL and PLG of the hy-
draulic brake booster connector.
OK:
Resistance: 5.7 kW
PREPARATION:
(a) Connect the connector (8P) to the hydraulic brake boost-
er.
(b) Disconnect the connector (8P) after the ignition switch is
turned ON and the pump motor is stopped.
CHECK:
Measure resistance between terminals PL and PLG of the hy-
draulic brake booster connector.
OK:
Resistance: 1.0 kW

DI-586- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
779 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1253 / 53 Motor Relay Circuit
CIRCUIT DESCRIPTION
The ABS motor 1 relay and ABS motor 2 relay supply power to the hydraulic brake booster pump motor.
While the ABS & BA & TRAC & VSC are activated, the ECU switches the motor relay ON and operates the
hydraulic brake booster pump motor.
DTC No.DTC Detecting ConditionTrouble Area
C1253 / 53
When any of the following 1. through 4. is detected:
1. After turning the ignition switch ON, open in the relay
coil is detected for more than 1 sec.
2. When the pressure switch does not control motor
driving, the condition that the motor relay is always ON
continues for more than 1 sec. due to short circuit.
3. When the pressure switch (PH) detects the low
pressure or while the pump motor operates to increase
the pressure, the condition that the motor relay does not
turn ON continues for more than 0.2 sec.
4. When pressure switch does not control motor driving,
the condition that the motor relay is always ON due to
the welded contact continues for more than 2 sec.

ABS motor 1 or ABS motor 2 relay

ABS motor 1 or ABS motor 2 relay circuit

Hydraulic brake booster pump motor circuit
DIC9V-02

DI-588- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
781 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1, in case of using the hand-held tester and start from step 3, in case of not
using hand-held tester.
1 Check ABS motor 1 and ABS motor 2 relay operation.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand-held tester.
CHECK:
Check the operation sound of the ABS motor relays individually when operating it with the hand-held tester.
OK:
The operation sound of the ABS motor 1 relay and ABS motor 2 relay should be heard.
NG Go to step 3.
OK
2 Check for short circuit (to B+) in harness and connector between MT of hydrau-
lic brake booster and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.

F17713
ABS & BA & TRAC
& VSC ECU ABS & BA & TRAC
& VSC Actuator
Engine Room R/B
Cowl Side J/B LHFL Block
Battery ABS MTR2 Relay
ABS MTR1 RelayPH A4111
PL A449
MR2 A442 O
W
Y-B A373
A384 PH
PL
3
A38
BM2
2
A37
BM1
A375
PHG
1
A37 GND1
1
A40 GND
2
A38 PLG
6
A38 GND2
EE
IF L-R
R
W-B
W-B
W-B
W-B
W-B
W-BW-B
W-B
W-B W-B W-B
2A3 2B 13
F152A41 MR129 A41R1+ 1 A44 R2+3
1
1
1C
1 1
2ABS No.2
3 4 2
1 1
2 43 1
1
1
1B-G
MAIN RW-L
P DI-592
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
785 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1254 / 54 Pressure Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1254 / 54
Either of the following 1. or 2. is detected:
1. After turning the ignition switch ON, short or open circuit
in pressure switch (PL) continued for more than 1 sec.
2. After turning the ignition switch ON, open in pressure
switch (PH) continued for more than 1 sec.

Pressure switch (PH or PL)

Pressure switch circuit
WIRING DIAGRAM
DIC9W-01

F09987
LOCK
PLGPL
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-593
786 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check pressure switch (PL) resistance.
PREPARATION:
(a) Disconnect the connector (8P) from the hydraulic brake
booster.
(b) With the ignition switch OFF, depress the brake pedal
more than 40 times to decrease the accumulator pres-
sure.
HINT:
When pressure in the power supply system is released, reac-
tion force becomes light and stroke becomes longer.
CHECK:
Measure resistance between terminals PL and PLG of the hy-
draulic brake booster connector.
OK:
Resistance: 5.1 to 6.3 kW
HINT:
After inspection, connect the connector and clear the DTC (See
page DI-505).
NG Replace hydraulic brake booster assembly.
OK

F06043
LOCK
PH
PHG
DI-594- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
787 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check pressure switch (PH) resistance.
PREPARATION:
(a) Disconnect the connector (5P) from the hydraulic brake
booster.
(b) With the ignition switch OFF, depress the brake pedal
more than 40 times to decrease the accumulator pres-
sure.
HINT:
When pressure in the power supply system is released, reac-
tion force becomes light and stroke becomes longer.
CHECK:
Measure resistance between terminals PH and PHG of the hy-
draulic brake booster connector.
OK:
Resistance: 0.9 to 1.1 kW
HINT:
After inspection, connect the connector and clear the DTC (See
page DI-505).
NG Replace hydraulic brake booster assembly.
OK
3 Check for open and short circuit in harness and connector between pressure
switch and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-595
788 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1256 / 56 Accumulator Low Pressure Malfunc-
tion
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1256 / 56
Any of the following 1. through 7. is detected:
1. With the vehicle running, when the pressure switch (PL)
detects high pressure, although ABS, TRAC or VSC
does not control, the pressure switch (PL) detects low
pressure for more than 1.4 sec.
2. With the vehicle running, when the pressure switch
(PL) detects high pressure, although ABS, TRAC or
VSC controls, the pressure switch (PL) detects low
pressure for more than 0.2 sec.
3. After the ignition switch is turned ON, the pressure
switch (PL) detects low pressure for more than 64 sec.
4. With the vehicle running, after ignition switch has been
ON, the pressure switch (PL) detects low pressure for
more than 0.2 sec. although ABS, TRAC, or VSC does
not control and when the pressure switch is ON and
stuck under high pressure.
5. With the vehicle running, after ignition switch is ON,
the pressure switch (PL) detects low pressure for more
than 0.2 sec. when ABS, TRAC or VSC controls, the
pressure switch is ON and stuck under high pressure.
6. With the vehicle running, after ignition switch is ON, the
pressure switch (PL) is stuck to under low pressure
although ABS, TRAC or VSC does not control for more
than 1.4 sec.
7. With the vehicle running, after ignition switch is ON, the
pressure switch (PL) is stuck under low pressure when
ABS, TRAC or VSC controls for more than 0.2 sec.

Accumulator

Pressure switch (PH or PL)

Hydraulic brake booster pump motor
DIC9X-02