ANTI-LOCK BRAKE SYSTEM(for Type B), Diagnostic DTC:C1401 and C1402
| DTC Code | DTC Name |
|---|---|
| C1401 | Front Speed Sensor RH Malfunction |
| C1402 | Front Speed Sensor LH Malfunction |
DESCRIPTION
Refer to DTCs C1413 and C1414.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
C1401 |
Front Speed Sensor RH Malfunction |
Any of the following conditions is detected:
|
|
C1402 |
Front Speed Sensor LH Malfunction |
Any of the following conditions is detected:
|
|
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 20 km/h (12 mph) for 30 seconds or more and check that the ABS warning light goes off.
Clear the DTCs.
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 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
-
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: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.
Result
Proceed to
OK
NG
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.
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.
Tip: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.
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
REPLACE FRONT SPEED SENSOR
Turn the ignition switch off.
Replace the front speed sensor.
Result
Proceed to
NEXT
RECONFIRM DTC
Clear the DTCs.
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.
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
Tip:If the front speed sensor rotor needs to be replaced, replace the front axle hub sub-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.
A END