C1414
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1413,C1414: Front Speed Sensor RH Output 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 C1413 is for the front speed sensor RH.
- DTC C1414 is for the front speed sensor LH.
WIRING DIAGRAM
Refer to DTCs C1401 and C1402 C1401.
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration and store system information Programming and Relearning.
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC Check For Intermittent Problems.
ABS/VSC/TRAC
ABS/VSC/TRAC:
OK:
There are no momentary interruptions.
HINT
Perform the above inspection before removing the sensor and connector.
NG -- CHECK FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)
(a) Turn the engine switch off.
(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 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 Meter / Gauge System.
OK:
The speed value output from the speed sensor displayed on the Techstream is the similar speed as indicated on the speedometer.
NG -- CHECK FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Turn the engine switch off.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(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 Reading and Clearing Diagnostic Trouble Codes.
Result:
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.
B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
A -- CHECK FOR INTERMITTENT PROBLEMS Electronic Circuit Inspection Procedure
4. CHECK FRONT SPEED SENSOR INSTALLATION
(a) Turn the engine switch off.
(b) Check the speed sensor installation (for 2WD).
OK:
There is no clearance between the sensor and the front steering knuckle.
(c) Check the speed sensor installation (for 4WD).
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:
D -- INSTALL FRONT SPEED SENSOR CORRECTLY (for 4WD)
C -- INSTALL FRONT SPEED SENSOR CORRECTLY (for 2WD)
B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)
A -- Continue to next step.
5. 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.
6. CHECK FRONT SPEED SENSOR ROTOR
(a) Remove the front speed sensor rotor Removal.
(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
The front speed sensor rotor is incorporated into the front axle hub sub-assembly.
If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.
NG -- CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)
(a) Install the front speed sensor and the front speed sensor rotor.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(c) Disconnect the front speed sensor connector and the skid control sensor wire.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NG -- REPLACE SKID CONTROL SENSOR WIRE
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)
(a) Reconnect the skid control sensor wire.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(c) Disconnect the skid control ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. INSPECT SKID CONTROL ECU (SENSOR INPUT)
(a) Reconnect the skid control ECU connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
for LH
Result:
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
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.
C -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
B -- REPLACE FRONT SPEED SENSOR (for 4WD) Removal
A -- REPLACE FRONT SPEED SENSOR (for 2WD) Removal