C1404

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1403: Rear Speed Sensor RH Malfunction

DTC C1403 - Rear Speed Sensor RH Malfunction

DTC C1404 - Rear 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. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Elements). The speed sensor rotor, which consists of 48 sets of N and S poles 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 the 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward waveform to the ECU.









HINT:
- DTC C1403 is for the rear speed sensor RH.
- DTC C1404 is for the rear speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK REAR SPEED SENSOR INSTALLATION




(a) Check the speed sensor installation.
OK:
There is no clearance between the sensor and the rear axle carrier.
The installation bolt is tightened properly.
Torque
8.5 N*m (87 kgf*cm, 75 in.*lbf)
NG -- INSTALL REAR SPEED SENSOR CORRECTLY
OK -- Continue to next step.
2. CHECK REAR SPEED SENSOR TIP
(a) Remove the rear speed sensor Removal.
(b) Check the speed sensor tip.
OK:
No scratches, oil, or foreign matter on the sensor tip.
NOTE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.

NG -- CLEAN OR REPLACE REAR SPEED SENSOR
OK -- Continue to next step.
3. CHECK REAR SPEED SENSOR ROTOR
(a) Remove the rear speed sensor rotor Removal.
(b) Check the speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
HINT:
The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.

NG -- CLEAN OR REPLACE REAR SPEED SENSOR ROTOR
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)
(a) Install the rear speed sensor and the rear 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





(e) Check the speed value output from the speed sensor displayed on the Techstream.
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 similar speed as indicated on the speedometer.
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 REAR SPEED SENSOR
OK -- CHECK FOR INTERMITTENT PROBLEMS
5. REPLACE REAR SPEED SENSOR
(a) Turn the engine switch off.
(b) Replace the rear speed sensor Removal.
NOTE:
Check the speed sensor signal after replacement Test Mode Procedure.

NEXT -- Continue to next step.
6. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(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 Reading and Clearing Diagnostic Trouble Codes.
Result:





NOTE:
Check the speed sensor signal after replacement Test Mode Procedure.
HINT:
- The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing 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 REAR SPEED SENSOR ROTOR
A -- END