The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the Multi-terrain ABS, EBD, BA, VSC, A-TRC, CRAWL and hill-start assist control systems. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Element). The speed sensor rotor, which consists of 48 sets of N and S poles that are arranged in a circle, is integrated with the inner race of the hub bearing. To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward wave to the skid control ECU.

DTC Code	DTC Detection Condition	Trouble Area
C0200/31 C0205/32	When any of the following conditions is detected: 1. At a vehicle speed of 10 km/h (6 mph) or more, the pulses are not input for 1 second. 2. A momentary interruption of the speed sensor signal occurs at least 255 times when switching the ignition switch ON and off. 3. Continuous noise occurs in the speed sensor signals at a vehicle speed of 20 km/h (12 mph) or more. 4. The speed sensor signal circuit is open for 0.12 seconds or more.	Front speed sensor RH Front speed sensor LH Harness or connector Speed sensor rotor Sensor installation Master cylinder solenoid (Skid control ECU)
C1235/35 C1236/36	Noise in the speed sensor signals occurs 75 times or more for 5 seconds when the vehicle speed is 20 km/h (12 mph) or more.	Front speed sensor RH Front speed sensor LH Speed sensor rotor Sensor installation Master cylinder solenoid (Skid control ECU)

HINT:

DTC C0200/31 and C1235/35 are for the front speed sensor RH.
DTC C0205/32 and C1236/36 are for the front speed sensor LH.

Wiring diagram

Inspection procedure

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration .

1.READ VALUE USING INTELLIGENT TESTER (FR/FL SPEED OPEN)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the intelligent tester on.

Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

ABS/VSC/TRC
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Speed Open	Front speed sensor RH open detection / Error or Normal	Error: Momentary interruption Normal: Normal	-
FL Speed Open	Front speed sensor LH open detection / Error or Normal	Error: Momentary interruption Normal: Normal	-

Check for any momentary interruption in the wire harness and connector corresponding to the DTC .

OK:

There are no momentary interruptions.

HINT:

Perform the above inspection before removing the sensor and connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.READ VALUE USING INTELLIGENT TESTER (FR/FL WHEEL SPEED, FR/FL WHEEL DIRECTION)

Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle.

ABS/VSC/TRC
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Wheel Speed	Front wheel speed sensor RH reading /min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	A similar speed is indicated on the speedometer.
FL Wheel Speed	Front wheel speed sensor LH reading /min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	A similar speed is indicated on the speedometer.

OK:

The speed value output from the speed sensor displayed on the intelligent tester is the same as the actual vehicle speed.

Check that the sensor signal conforms to the wheel direction.

ABS/VSC/TRC
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Wheel Direction	Front wheel direction RH / Forward or Back	Forward: Forward Back: Backward	-
FL Wheel Direction	Front wheel direction LH / Forward or Back	Forward: Forward Back: Backward	-

OK:

The wheel direction is displayed correctly.

NG

Go to step 4

OK

3.PERFORM SIGNAL CHECK

Check if test mode (signal check) DTCs are output.

HINT:

Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.

Result
Result Proceed to
Test mode (signal check) DTC is output A
Test mode (signal check) DTC is not output B

B

Go to step 10

A

4.INSPECT FRONT SPEED SENSOR INSTALLATION

Check the speed sensor installation .

OK:

The installation bolt is tightened properly.

There is no clearance between the sensor and front steering knuckle.

NOTICE:

Check the speed sensor signal after replacement .

NG

INSTALL FRONT SPEED SENSOR CORRECTLY

OK

5.INSPECT SPEED SENSOR TIP

Remove the front speed sensor .

Check the sensor tip.

OK:

No scratches or foreign matter on the sensor tip.

NOTICE:

Check the speed sensor signal after cleaning/replacement .

NG

CLEAN OR REPLACE FRONT SPEED SENSOR

OK

6.INSPECT FRONT SPEED SENSOR

Diagnostic trouble code C0200 C0205 C1235 C1236 Land Cruiser Install the front speed sensor.

Install the front speed sensor.

Turn the ignition switch off.

Disconnect the z17 and/or z18 front speed sensor connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for RH:

Tester Connection	Switch Condition	Specified Condition
z17-2 (FR+) - Body ground	Ignition switch off	10 k? or higher
z17-1 (FR-) - Body ground	Ignition switch off	10 k? or higher

for LH:

Tester Connection	Switch Condition	Specified Condition
z18-2 (FL+) - Body ground	Ignition switch off	10 k? or higher
z18-1 (FL-) - Body ground	Ignition switch off	10 k? or higher

Text in Illustration
*1	Component without harness connected (Front Speed Sensor)
*a	for RH
*b	for LH

NG

REPLACE FRONT SPEED SENSOR

OK

7.INSPECT SKID CONTROL SENSOR WIRE

Diagnostic trouble code C0200 C0205 C1235 C1236 Land Cruiser Disconnect the z17 and Az2/z18 and Az1 skid control sensor wire connectors.

Disconnect the z17 and Az2/z18 and Az1 skid control sensor wire connectors.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for RH:

Tester Connection	Condition	Specified Condition
z17-2 (FR+) - Az2-5	Always	Below 1 ?
z17-2 (FR+) - Az2-1	Always	10 k? or higher
z17-2 (FR+) - Body ground	Always	10 k? or higher
z17-1 (FR-) - Az2-1	Always	Below 1 ?
z17-1 (FR-) - Az2-5	Always	10 k? or higher
z17-1 (FR-) - Body ground	Always	10 k? or higher

for LH:

Tester Connection	Condition	Specified Condition
z18-2 (FL+) - Az1-5	Always	Below 1 ?
z18-2 (FL+) - Az1-1	Always	10 k? or higher
z18-2 (FL+) - Body ground	Always	10 k? or higher
z18-1 (FL-) - Az1-1	Always	Below 1 ?
z18-1 (FL-) - Az1-5	Always	10 k? or higher
z18-1 (FL-) - Body ground	Always	10 k? or higher

Text in Illustration
*1	Component without harness connected (Skid Control Sensor Wire)
*a	Sensor Side Connector
*b	Vehicle Side Connector
*c	for RH
*d	for LH

NOTICE:

Check the speed sensor signal after replacement .

NG

REPLACE SKID CONTROL SENSOR WIRE

OK

8.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR WIRE)

Disconnect the A24 skid control ECU connector and Az2/Az1 skid control sensor wire connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for RH:

Tester Connection	Condition	Specified Condition
A24-3 (FR+) - Az2-5	Always	Below 1 ?
A24-3 (FR+) - Body ground	Always	10 k? or higher
A24-17 (FR-) - Az2-1	Always	Below 1 ?
A24-17 (FR-) - Body ground	Always	10 k? or higher

for LH:

Tester Connection	Condition	Specified Condition
A24-18 (FL+) - Az1-5	Always	Below 1 ?
A24-18 (FL+) - Body ground	Always	10 k? or higher
A24-4 (FL-) - Az1-1	Always	Below 1 ?
A24-4 (FL-) - Body ground	Always	10 k? or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.INSPECT MASTER CYLINDER SOLENOID (SKID CONTROL ECU OUTPUT VOLTAGE)

Diagnostic trouble code C0200 C0205 C1235 C1236 Land Cruiser Reconnect the A24 skid control ECU connector.

Reconnect the A24 skid control ECU connector.

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:

for RH:

Tester Connection Switch Condition Specified Condition
Az2-5 - Body ground Ignition switch ON 7.5 to 12 V
for LH:

Tester Connection Switch Condition Specified Condition
Az1-5 - Body ground Ignition switch ON 7.5 to 12 V
Text in Illustration
*1 Front view of wire harness connector (to Front Speed Sensor Wire)
*a for RH
*b for LH
Result
Result Proceed to
OK A
NG for LHD B
for RHD C

B

REPLACE MASTER CYLINDER SOLENOID

C

REPLACE MASTER CYLINDER SOLENOID

A

10.RECONFIRM DTC

Clear the DTCs .

Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.

Check if the same DTCs are output .

HINT:

Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result
Result	Proceed to
DTC is output	A
DTC is not output (When troubleshooting in accordance with the Diagnostic Trouble Code Chart)	B
DTC is not output (When troubleshooting in accordance with the Problem Symptoms Table)	C

B

USE SIMULATION METHOD TO CHECK

C

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

A

11.REPLACE FRONT SPEED SENSOR

Replace the front speed sensor .

NOTICE:

Check the speed sensor signal after replacement .

NEXT

12.RECONFIRM DTC

Clear the DTCs .

Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.

Check if the same DTCs are output .

HINT:

Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result
Result Proceed to
DTC is output A
DTC is not output B

B

END

A

13.INSPECT SPEED SENSOR ROTOR

Remove the front axle hub sub-assembly .

Check the sensor rotor.

OK:

No scratches, oil, or foreign matter on the rotors.

NOTICE:

Check the speed sensor signal after cleaning/replacement .

Result
Result Proceed to
NG A
OK for LHD B
for RHD C

B

REPLACE MASTER CYLINDER SOLENOID

C

REPLACE MASTER CYLINDER SOLENOID

A

CLEAN OR REPLACE FRONT AXLE HUB SUB-ASSEMBLY (SPEED SENSOR ROTOR)

Result
Result	Proceed to
Test mode (signal check) DTC is output	A
Test mode (signal check) DTC is not output	B