Page 822 of 3115
F02870
Master Cylinder
Pressure Sensor
(Shielded)ABS & BA & TRAC
& VSC ECU
MSS VCM
E2 22
VOUT10
3 21
23 VCC
PMC
GND M4
A41 B
WR
A4112 A41
A41 DI-570
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
763 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1246 / 46 Master Cylinder Pressure Sensor
Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1246 / 46
Either of the following 1., 2., 3., 4. or 5. is detected:
1. At a vehicle speed of 4 mph (7 km/h) or more, PMC ter-
minal voltage does not change by more than 0.005 V
once it exceeds 0.86 V continues for at least 30 secs.
2. Interference occurs to ECU terminal PMC 7 times or
more for 5 sec.
3. ECU terminal STP is OFF, and the condition that termi-
nal PMC voltage becomes more than 0.86 V or less than
0.3 V continues for 5 sec. or more.
4. The condition that ECU terminal IG1 voltage is 9.5 V to
17.0 V, and terminal VCM voltage other than the range
from 4.4 V to 5.6 V continues for 1.2 sec. or more.
5. The condition that ECU terminal VCM voltage is 4.4 V to
5.6 V, and terminal PMC voltage other than the range
from 0.14 V to 4.85 V continues for 1.2 sec. or more.
Master cylinder pressure sensor
Master cylinder pressure sensor circuit
WIRING DIAGRAM
DIC9R-01
Page 823 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-571
764 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 2 in case of not
using the hand-held tester.
1 Check output value of the master cylinder pressure sensor.
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:
Check that the brake fluid pressure value of the master cylinder pressure sensor displayed on the hand-held
tester is changing when depressing the brake pedal.
OK:
Brake fluid pressure value must be changing.
OK Go to step 4.
NG
2 Check master cylinder pressure sensor.
PREPARATION:
(a) Install the LSPV gauge to the front caliper bleeder plug portion, and bleed the LSPV gauge.
SST 09709-29018
(b) Remove the air cleaner inlet and battery clamp cover.
CHECK:
Start the engine and depress the brake pedal, then check the relation between the fluid pressure and voltage
of PMC and E2 terminals of the skid control ECU with connectors still connected.
OK:
Front brake caliper fluid pressureVoltage
0 kPa (0 Kgf/cm2, 0 psi)0.37 to 0.63 V
5,883 kPa (60 kgf/cm2, 853 psi)1.57 to 1.83 V
11,768 kPa (120 kgf/cm2, 1,706 psi)2.77 to 3.03 V
HINT:
Voltage between terminals VCM and E2: 4.7 to 5.3 V
NG Replace master cylinder pressure sensor.
OK
Page 824 of 3115
DI-572- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
765 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check for open and short circuit in harness and connector between master cyl-
inder pressure sensor and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace master cylinder pressure sensor.
4 Check whether or not the ECU terminal STP input voltage is changed when the
stop light switch is turned on and off.
NO Check the stop light switch circuit (See page
DI-573).
YES
Check and replace skid control ECU.
Page 860 of 3115
DI-608- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
801 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1290 / 66 Zero Point Calibration of Steering Sen-
sor Undone
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1290 / 66
The steering sensor zero point calibration position vastly
differs from the recorded value.
(The angle becomes larger)Yaw rate sensor zero point calibration undone
Steering angle sensor zero point calibration undone
INSPECTION PROCEDURE
1 Perform zero point calibration. (See page DI-505)
HINT:
This code is output when a problem occurs in a zero point calibration of the steering angle sensor and yaw
rate sensor.
Therefore, clear the stored zero point calibration data and correct the zero points.
(a) Clear the zero point calibration data.
(b) Perform a zero point calibration of the steering sensor and yaw rate sensor.
NEXT
2 Is DTC output?
(a) Clear the DTCs.
(b) Turn the ignition switch to the ON position.
(c) Are the same DTCs detected?
NO Proceed to next circuit inspection shown in
problem symptoms table.
YES
No problem.
HINT:
When the registered data is not equal to the input data, the DTC will be output.
DICA0-01
Page 861 of 3115
F17752
ABS & BA & TRAC
& VSC ECU Y1
Yaw Rate Sensor
ShieldedGL1
GL2
YD
VYS
YAW
GYAW
YSS A43
1827 289 191022
G
Y
L
B
W
R 4
2
6
8
1
5A43
A43
A43
A43
A43
A43 IG4
IG4
IG4
IG4
IG4
IG4
IG416
17
21
19
20
18
22
ShieldedG
Y
L
B
W
R GL1
GL2
YD
VYS
YAW 2
GYAW
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-609
802 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1336 / 39 Zero Point Calibration of Deceleration
Sensor Undone
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1236 / 39
When either of the following 1. or 2. is detected:
1. In TEST mode, the shift lever is shifted to other than P
position within 2 sec. after ECU terminal IG1 is turned
ON for the first time.
2. When the deceleration sensor zero point recorded in
ECU is deleted.
Deceleration sensor
Deceleration sensor circuit
PNP switch circuit (R position)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check whether zero point calibration of yaw rate (deceleration) sensor has been
done or not.
PREPARATION:
Shift the shift lever in the P position and turn the ignition switch ON. Repeat connecting and releasing Ts
and E
1 terminals of the DLC1 4 times or more for 8 sec. After this, turn the ignition switch OFF and after
connecting terminals Ts and E
1, turn it ON again.
DICA1-01
Page 862 of 3115
DI-610- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
803 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Carry out yaw rate (deceleration) sensor zero point calibration and confirm it by
VSC TRAC warning light.
OK:
VSC TRAC warning light blinks
OK No problem.
NG
3 Check DTC for the VSC (See page DI-505).
*1 :Other than DTC C1336 / 39 is output.
*
2 :DTC C1336 / 39 only is output.
*
1Repair ABS control system according to the
code output.
*
2
4 Check for open and short circuit in harness and connector between PNP switch
(P position) and skid control ECU and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
5 Check for open and short circuit in harness and connector between yaw rate
(deceleration) sensor and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Page 863 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-61 1
804 Author: Date:
2004 LAND CRUISER (RM1071U)
6 Check yaw rate (deceleration) sensor (See page DI-505).
NG Replace yaw rate sensor.
OK
Check and replace skid control ECU.
Page 868 of 3115
DIC94-02
BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
-VHigh Speed
Low Speed
CoilNS
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-615
808 Author: Date:
2004 LAND CRUISER (RM1071U)
CIRCUIT INSPECTION
DTC
C0200 / 31 - C1239 / 39Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used for control
of the ABS & BA & TRAC & VSC control system. The front and
rear rotors each have 48 serrations.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates AC voltage. Since
the frequency of this AC voltage changes in direct proportion to
the speed of the rotor, the frequency is used by the ECU to de-
tect the speed of each wheel.
DTC No.DTC Detecting ConditionTrouble Area
C0200 / 31
C0205 / 32
C0210 / 33
C0215 / 34
Detection of any of the conditions 1. through 4.:
1. At a vehicle speed of 6 mph (10 km/h) or more, pulses
are not input for 15 sec.
2. Momentary interruption of the speed sensor signal oc-
curs at least 7 times in the time between switching the
ignition switch ON and switching it OFF.
3. Continuous noise occurs into the speed sensor signals
with a vehicle speed at 12 mph (20 km/h) or more.
4. The condition that the speed sensor signal circuit is
open continues for 0.12 sec. or more.
ABS does not function
Brake pedal is not depressed
Parking brake is not set
Rear differential does not lock
Under the above conditions, when the difference in velocity
between the highest rotating and the second highest rotat-
ing wheels is within 1 mph (2 km/h), the slowest wheel ro-
tates at 0 mph (0 km/h), and the second slowest wheel
rotates at 7 mph (12 km/h) for 1 second or more.
Right front, left front, right rear and left rear speed sensor
Each speed sensor circuit
Sensor rotor
C1235 / 35
C1236 / 36
C1238 / 38
C1239 / 39Continuous noise occurs into the speed sensor
signals with a vehicle speed at 12 mph (20 km/h)
or more continues for 5 sec or more.Right front, left front, right rear, left rear speed sensor
Speed sensor rotor
HINT:
DTC No. C0200 / 31 and C1235 / 35 are for the right front speed sensor.
DTC No. C0205 / 32 and C1236 / 36 are for the left front speed sensor.
DTC No. C0210 / 33 and C1238 / 38 are for the right rear speed sensor.
DTC No. C0215 / 34 and C1239 / 39 are for the left rear speed sensor.
