VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1401, C1402

DTC Code	DTC Name
C1401	Front Speed Sensor RH Malfunction
C1402	Front Speed Sensor LH Malfunction

DESCRIPTION

Refer to DTCs C1413 and C1414.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1401	Front Speed Sensor RH Malfunction	Any of the following is detected: 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 (for 2WD). 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 30 seconds or more (for AWD). 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. 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 (for 2WD). 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 30 seconds or more (for AWD).	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: 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 (for 2WD). 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 30 seconds or more (for AWD). 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. 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 (for 2WD). 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 30 seconds or more (for AWD).	Front speed sensor LH Sensor installation Front speed sensor rotor LH (front drive shaft assembly LH)

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1401

Front Speed Sensor RH Malfunction

Any of the following is detected:

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 (for 2WD).
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 30 seconds or more (for AWD).
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.
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 (for 2WD).
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 30 seconds or more (for AWD).

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:

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 (for 2WD).
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 30 seconds or more (for AWD).
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.
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 (for 2WD).
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 30 seconds or more (for AWD).

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

Tech Tips

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

Drive the vehicle at 30 km/h (19 mph) for 30 seconds or more and check that the ABS warning light goes off.
Clear the DTCs.

Tech Tips

DTC C1401 is for the front speed sensor RH.
DTC C1402 is for the front speed sensor LH.

PROCEDURE

CHECK FRONT SPEED SENSOR INSTALLATION

*1	Front Speed Sensor
*a	Correct
*b	Incorrect
*c	8.5 N*m
*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 Nm (87 kgfcm, 75 in.*lbf)

Result

Proceed to
OK
NG

INSTALL FRONT SPEED SENSOR CORRECTLY Click here

CHECK FRONT SPEED SENSOR AND SENSOR ROTOR

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

for speed sensor: Click here

for sensor rotor (for 1AR-FE): Click here

for sensor rotor (for 2GR-FE): Click here

Check the speed sensor tip and speed sensor rotor.

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

Note

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 here

Result

Proceed to
OK
NG

CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

READ VALUE USING GTS (FRONT SPEED SENSOR)

Install the front speed sensor and the component with the sensor rotor.
Connect the GTS to the DLC3.
Start the engine.

Select the Data List using the GTS.

Click here

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

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

Tech Tips

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 here

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

Note

Check the speed sensor signal after replacement.

Click here

Result

Proceed to
OK
NG

USE SIMULATION METHOD TO CHECK Click here

REPLACE FRONT SPEED SENSOR

Turn the ignition switch off.

Replace the front speed sensor.

Click here

Note

Check the speed sensor signal after replacement.

Click here

Result

Proceed to
NEXT

RECONFIRM DTC

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

Result

Result	Proceed to
DTCs C1401 and C1402 are not output.	A
DTCs C1401 and/or C1402 are output.	B

Note

Check the speed sensor signal after replacement.

Click here

Tech Tips

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 here

END

REPLACE FRONT DRIVE SHAFT ASSEMBLY for 1AR-FE: Click here
REPLACE FRONT DRIVE SHAFT ASSEMBLY for 2GR-FE: Click here