C1401
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1401,C1402: Front Speed Sensor RH Malfunction
C1402 - Front Speed Sensor LH Malfunction
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system.
Speed sensor rotors have 48 serrations. The hall IC type speed sensor uses the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect vehicle speeds even when the vehicle is nearly stationary.
HINT
* DTC C1401 is for the front speed sensor RH.
* DTC C1402 is for the front speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK FRONT SPEED SENSOR INSTALLATION
(a) Check the speed sensor installation.
OK:
There is no clearance between the sensor and the front steering knuckle.
The installation nut is tightened properly.
Torque
8.5 N*m (87 kgf*cm, 75 in.*lbf)
NG -- INSTALL FRONT SPEED SENSOR CORRECTLY Installation
OK -- Continue to next step.
2. CHECK FRONT SPEED SENSOR TIP
(a) Remove the front speed sensor Removal.
(b) Check the speed sensor tip.
OK:
No scratches, oil, or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
NG -- CLEAN OR REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
3. CHECK FRONT SPEED SENSOR ROTOR
(a) Remove the front speed sensor rotor Removal for 2AZ-FE or Removal for 2ZR-FE).
(b) Check the speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
HINT
If the front speed sensor rotor needs to be replaced, replace it together with the front axle outboard joint shaft assembly.
NG -- CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)
(a) Install the front speed sensor and the front speed sensor rotor.
(b) Connect the Techstream to the DLC3.
(c) Start the engine.
(d) Select the Data List on the Techstream Data List / Active Test.
ABS/VSC/TRAC
ABS/VSC/TRAC:
(e) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.
HINT
Factors that affect the indicated vehicle speed include tire size, tire inflation, 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 On-Vehicle inspection.
OK:
The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
HINT
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.
NG -- REPLACE FRONT SPEED SENSOR
OK -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System
5. REPLACE FRONT SPEED SENSOR
(a) Turn the ignition switch off.
(b) Replace the front speed sensor Removal.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
6. RECONFIRM DTC
(a) Clear the DTCs Vehicle Stability Control System.
(b) Start the engine.
(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.
(d) Check if the same DTC is recorded Vehicle Stability Control System.
Result:
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
HINT
* If the front speed sensor rotor needs to be replaced, replace it together with the front axle outboard joint shaft assembly.
* If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.
B -- REPLACE FRONT SPEED SENSOR ROTOR
A -- END