BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS  ANTI-LOCK BRAKE SYSTEM  C1401  Front Speed Sensor RH Malfunction  C1402  Front Speed Sensor LH Malfunction  


DESCRIPTION

Refer to DTCs C1413 and C1414.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>C1271

DTC No. Detection Item DTC Detection Condition Trouble Area
C1401 Front Speed Sensor RH Malfunction Any of the following is detected:
1.

At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.

2.

At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.

3.

At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more.


·

Front speed sensor RH

·

Sensor installation

·

Front speed sensor rotor RH (front drive shaft assembly RH)


C1402 Front Speed Sensor LH Malfunction Any of the following is detected:
1.

At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.

2.

At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.

3.

At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more.


·

Front speed sensor LH

·

Sensor installation

·

Front speed sensor rotor LH (front drive shaft assembly LH)



HINT:

Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed:

1.

Drive the vehicle at 20 km/h (12 mph) for 30 seconds or more and check that the ABS warning light goes off.

2.

Clear the DTCs.



HINT:
·

DTC C1401 is for the front speed sensor RH.

·

DTC C1402 is for the front speed sensor LH.



PROCEDURE

1.CHECK FRONT SPEED SENSOR INSTALLATION
a.
C168336C10
1.031,0.823 1.25,0.49 false 0.917,1.49 1.24,1.74 false 0.75,1.823 1.073,1.99 0.323,0.167 10 *a 2.427,1.823 2.75,1.99 0.323,0.167 10 *b 0.135,0.135 0.448,0.333 0.313,0.198 10 *1 1.292,0.313 1.625,0.521 0.333,0.208 10 *c 1.292,1.729 1.604,1.927 0.313,0.198 10 *d
*1 Front Speed Sensor
*a Correct
*b Incorrect
*c 8.5 Nm
*d No clearance


Check the speed sensor installation.

OK:

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

The installation bolt is tightened properly.

Torque:

8.5 N*m (87 kgf*cm, 75 in.*lbf)



Result:
Proceed to
OK
NG



OK

2.CHECK FRONT SPEED SENSOR AND SENSOR ROTOR

NG

INSTALL FRONT SPEED SENSOR CORRECTLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>FRONT SPEED SENSOR>INSTALLATION


2.CHECK FRONT SPEED SENSOR AND SENSOR ROTOR
a.

Remove the front speed sensor and the component with the sensor rotor.

for speed sensor: Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>FRONT SPEED SENSOR>REMOVAL

for sensor rotor (for 2NZ-FE): Click hereDrivetrain>DRIVE SHAFT / PROPELLER SHAFT>FRONT DRIVE SHAFT ASSEMBLY(for 2NZ-FE)>REMOVAL

for sensor rotor (except 2NZ-FE): Click hereDrivetrain>DRIVE SHAFT / PROPELLER SHAFT>FRONT DRIVE SHAFT ASSEMBLY(for 1ZR-FE, 2ZR-FE)>REMOVAL


b.

Check the speed sensor tip and speed sensor rotor.

OK:

No scratches, oil, or foreign matter on the sensor tip and rotor.


NOTICE:
·

If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.

·

Check the speed sensor signal after cleaning or replacement.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>TEST MODE PROCEDURE




Result:
Proceed to
OK
NG



OK

3.READ VALUE USING GTS (FRONT SPEED SENSOR)

NG

CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

3.READ VALUE USING GTS (FRONT SPEED SENSOR)
a.

Install the front speed sensor and the component with the sensor rotor.


b.

Connect the GTS to the DLC3.


c.

Start the engine.


d.

Select the Data List using the GTS.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DATA LIST / ACTIVE TEST

Chassis > ABS/VSC/TRC > Data List
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) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
FL Wheel Speed Front wheel speed sensor LH reading Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
Chassis > ABS/VSC/TRC > Data List
Tester Display
FR Wheel Speed
FL Wheel Speed
50003 105 1,2

e.

Check the speed value output from the speed sensor displayed on the GTS.

HINT:

Factors that affect the indicated vehicle speed include tire size, tire pressure, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>ON-VEHICLE INSPECTION


OK:

The speed value output from the speed sensor displayed on the GTS is similar to the speed indicated on the speedometer.



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

4.REPLACE FRONT SPEED SENSOR
4.REPLACE FRONT SPEED SENSOR
a.

Turn the ignition switch off.


b.

Replace the front speed sensor.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>FRONT SPEED SENSOR>REMOVAL

NOTICE:

Check the speed sensor signal after replacement.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>TEST MODE PROCEDURE



Result:
Proceed to
NEXT



NEXT

5.RECONFIRM DTC
5.RECONFIRM DTC
a.

Clear the DTCs.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR

Chassis > ABS/VSC/TRC > Clear DTCs
50002 105

b.

Turn the ignition switch off.


c.

Start the engine.


d.

Perform a road test.


e.

Check if the same DTC is output.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR

Chassis > ABS/VSC/TRC > Trouble Codes
50001 105
Result:
Result Proceed to
DTCs C1401 and C1402 are not output. A
DTCs C1401 and/or C1402 are output. B


NOTICE:

Check the speed sensor signal after replacement.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>TEST MODE PROCEDURE


HINT:
·

If the front speed sensor rotor needs to be replaced, replace the front drive shaft assembly.

·

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>PROBLEM SYMPTOMS TABLE





A

END

B

REPLACE FRONT DRIVE SHAFT ASSEMBLY

for 2NZ-FE: Click hereDrivetrain>DRIVE SHAFT / PROPELLER SHAFT>FRONT DRIVE SHAFT ASSEMBLY(for 2NZ-FE)>REMOVAL

except 2NZ-FE: Click hereDrivetrain>DRIVE SHAFT / PROPELLER SHAFT>FRONT DRIVE SHAFT ASSEMBLY(for 1ZR-FE, 2ZR-FE)>REMOVAL