DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU (brake actuator assembly). These signals are used for brake control.
The 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 (brake actuator assembly).
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
C1403 |
Rear Speed Sensor RH Malfunction |
Any of the following is detected:
|
|
C1404 |
Rear Speed Sensor LH Malfunction |
Any of the following is detected:
|
|
HINT:
DTC will be output when conditions for any of the patterns in the table above are met.
PROCEDURE
1. |
CHECK REAR SPEED SENSOR INSTALLATION |
(a) Turn the ignition switch off.
(b) Check the rear speed sensor installation (See page ). OK: There is no clearance between the sensor and the rear axle housing. The installation bolt is tightened properly. Text in Illustration
|
|
NG |
INSTALL REAR SPEED SENSOR CORRECTLY |
|
2. |
INSPECT REAR SPEED SENSOR TIP |
(a) Remove the rear speed sensor (See page ).
(b) Check the speed sensor tip.
OK:
No scratches, oil, or foreign matter on the sensor tip.
NOTICE:
NG |
CLEAN OR REPLACE REAR SPEED SENSOR |
|
3. |
INSPECT REAR AXLE SHAFT BEARING |
(a) Remove the rear axle shaft bearing (See page ).
(b) Check the rear skid control rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTICE:
Check the speed sensor signal after cleaning or replacement (See page ).
HINT:
(c) Reinstall the rear axle shaft bearing.
NG |
CLEAN OR REPLACE REAR AXLE SHAFT BEARING |
|
4. |
READ VALUE USING TECHSTREAM (REAR SPEED SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
(e) According to the display on the Techstream, read the Data List.
ABS/VSC/TRAC
Tester Display |
Measurement Item |
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 |
(f) 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 (See page ).
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).
NOTICE:
Check the speed sensor signal after replacement (See page ).
HINT:
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See page ).
OK |
USE SIMULATION METHOD TO CHECK |
|
5. |
REPLACE REAR SPEED SENSOR |
(a) Turn the ignition switch off.
(b) Replace the rear speed sensor (See page ).
NOTICE:
After replacing the speed sensor, perform a Test Mode (signal check) inspection sensor check (See page ).
|
6. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.
(e) Check if the same DTC is recorded (See page ).
Result
Result |
Proceed to |
---|---|
DTCs C1403 and C1404 are not output |
A |
DTCs C1403 and/or C1404 are output |
B |
NOTICE:
Check the speed sensor signal after replacement (See page ).
HINT:
A |
END |
B |
REPLACE REAR AXLE SHAFT BEARING |
Electronic Circuit Inspection Procedure
ELECTRONIC CIRCUIT INSPECTION PROCEDURE
1. BASIC INSPECTION
(a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS
(1) Unless otherwise stated, all resistance measurements should be made at an
ambient temperature of 20°C (68°F). Resistance measurements may be inaccurate if
measured at high tempe ...
Route cannot be Calculated
PROCEDURE
1.
SET DESTINATION
(a) Set another destination and check if the system can calculate the route correctly.
OK:
Route can be correctly calculated.
OK
NORMAL OPERATION
NG
PROCEED TO NEXT SUSPECTED AREA SHOWN ...
Dtc Check / Clear
DTC CHECK / CLEAR
CHECK DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
(e) Check for DTCs.
Click here
CLEAR DTC
(a) Connect the Techstream to the ...