DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.
Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn.
Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU.
Tech Tips
The output voltage values shown below are those when the skid control ECU and the speed sensors are connected to the vehicle harness.
DTC Code | DTC Detection Condition | Trouble Area |
---|---|---|
C1403 C1404 |
Any of the following is detected:
|
|
Tech Tips
DTC C1403 is for the rear speed sensor RH.
DTC C1404 is for the rear speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
CHECK REAR SPEED SENSOR INSTALLATION
Check the speed sensor installation (for 2WD).
OK |
---|
There is no clearance between the sensor and the rear axle carrier. |
Check the speed sensor installation (for AWD).
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) |
Result | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
|
B |
READ VALUE USING INTELLIGENT TESTER (REAR SPEED SENSOR) Click here |
C |
INSTALL REAR SPEED SENSOR CORRECTLY (for 2WD) Click here |
D |
INSTALL REAR SPEED SENSOR CORRECTLY (for AWD) Click here |
A |
CHECK REAR SPEED SENSOR TIP
Remove the rear speed sensor Click here.
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 Click here.
NG |
CLEAN OR REPLACE REAR SPEED SENSOR |
OK |
CHECK REAR SPEED SENSOR ROTOR
Remove the rear speed sensor rotor Click here.
Check the speed sensor rotor.
OK |
---|
No scratches, oil, or foreign matter on the rotor. |
Note
Check the speed sensor signal after cleaning or replacement Click here.
Tech Tips
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 |
READ VALUE USING INTELLIGENT TESTER (REAR SPEED SENSOR)
Install the rear speed sensor and the rear speed sensor rotor.
Connect the intelligent tester to the DLC3.
Start the engine.
Select the Data List on the intelligent tester Click here.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
RR Wheel Speed | Rear 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 |
RL Wheel Speed | Rear 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 |
Check that the speed value output from the speed sensor displayed on the intelligent tester.
Tech Tips
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 Click here.
OK |
---|
The speed value output from the speed sensor displayed on the intelligent tester is the similar speed as indicated on the speedometer. |
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
Note
Check the speed sensor signal after replacement Click here.
Tech Tips
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 with rear speed sensor Click here for 2WD).
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.
B |
REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR |
C |
CHECK FOR INTERMITTENT PROBLEMS Click here |
A |
REPLACE REAR SPEED SENSOR
Turn the engine switch off.
Replace the rear speed sensor Click here.
Note
Check the speed sensor signal after replacement Click here.
NEXT |
RECONFIRM DTC
Clear the DTCs Click here.
Start the engine.
Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.
Check if the same DTC is recorded Click here.
Result | ||||||
---|---|---|---|---|---|---|
|
Note
Check the speed sensor signal after replacement Click here.
Tech Tips
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 Click here.
B |
REPLACE REAR SPEED SENSOR ROTOR |
A |
END