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C1275






BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1237, C1275-C1278; Speed Sensor Rotor Faulty; 2013 MY FR-S [03/2012 -]
C1237 - Speed Sensor Rotor Faulty
C1275 - Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1276 - Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)
C1277 - Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1278 - Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from the speed sensor.

These signals are used for recognizing that all four wheels are operating properly.

Therefore, all wheel signals must be equal.

DTCs C1275 to C1278 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1275 to C1278 are output only in Test Mode.





HINT
* DTC C1275 is for the front speed sensor RH.
* DTC C1276 is for the front speed sensor LH.
* DTC C1277 is for the rear speed sensor RH.
* DTC C1278 is for the rear speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1330, C1331, C1332, C1333, C1464, C1465, C1466 and C1467 C1271 for front, and C1273 for rear).

INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform VSC sensor neutral memorization Programming and Relearning.

HINT
When C1330, C1331, C1332, C1333, C1464, C1465, C1466 and/or C1467 is output together with C1237, inspect and repair the trouble areas indicated by C1330, C1331, C1332, C1333, C1464, C1465, C1466 and/or C1467 first C1271 for front, and/or C1273 for rear).

PROCEDURE

1. CHECK TIRES

(a) Check the size and condition of all four wheels Component Tests and General Diagnostics.

HINT
The DTC is output when tire deformation or a difference in tire size is detected.

OK:

The diameter of all four tires and the tire pressure are the same.

NG -- REPLACE TIRES SO THAT ALL FOUR TIRES ARE THE SAME SIZE
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (SPEED SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Select the Data List using the Techstream Data List / Active Test.

ABS/VSC/TRAC





(d) 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 pressure, 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 Component Tests and General Diagnostics.

OK:

The speed value output from the speed sensor displayed on the Techstream is similar to the speed indicated on the speedometer.

Result:





B -- CHECK FRONT SPEED SENSOR INSTALLATION

C -- CHECK REAR SPEED SENSOR INSTALLATION
A -- Continue to next step.

3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

(a) Turn the ignition switch off.

(b) Perform the sensor check using the Test Mode procedure Test Mode Procedure.

OK:

All Test Mode DTCs are not output.

Result:





B -- CHECK FRONT SPEED SENSOR INSTALLATION

C -- CHECK REAR SPEED SENSOR INSTALLATION
A -- Continue to next step.

4. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) Start the engine.

(d) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPLACE FRONT SPEED SENSOR

C -- REPLACE REAR SPEED SENSOR

A -- CHECK FOR INTERMITTENT PROBLEMS

5. CHECK FRONT SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.





(b) Check the speed sensor installation.

OK:

There is no clearance between the sensor and the steering knuckle.

The installation bolt is tightened properly.

Torque
7.5 N*m (76 kgf*cm, 66 in.*lbf)

NG -- INSTALL FRONT SPEED SENSOR CORRECTLY Installation
OK -- Continue to next step.

6. CHECK FRONT SPEED SENSOR TIP

(a) Remove the front speed sensor Removal.

(b) Check the speed sensor tip.

OK:

No scratches 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.

7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)

(a) Install the front speed sensor Installation.

(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 (brake actuator assembly) connector and the front speed sensor 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.

8. RECONFIRM DTC

(a) Reconnect the skid control ECU (brake actuator assembly) connector and the front speed sensor connector.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the ignition switch off.

(d) Start the engine.

(e) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.

(f) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- CHECK FOR INTERMITTENT PROBLEMS
A -- Continue to next step.

9. 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.

10. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) Start the engine.

(d) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- END
A -- Continue to next step.

11. REPLACE FRONT SPEED SENSOR ROTOR

(a) Turn the ignition switch off.

(b) Replace the front speed sensor rotor Removal.

HINT
If the front speed sensor rotor needs to be replaced, replace the front axle hub sub-assembly.

NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.

NEXT -- Continue to next step.

12. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) Start the engine.

(d) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- END

A -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

13. CHECK REAR SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.





(b) Check the speed sensor installation.

OK:

There is no clearance between the sensor and the rear axle carrier sub-assembly.

The installation bolt is tightened properly.

Torque
7.5 N*m (76 kgf*cm, 66 in.*lbf)

NG -- INSTALL REAR SPEED SENSOR CORRECTLY Installation
OK -- Continue to next step.

14. CHECK REAR SPEED SENSOR TIP

(a) Remove the rear speed sensor Removal.

(b) Check the speed sensor tip.

OK:

No scratches or foreign matter on the sensor tip.

NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.

NG -- CLEAN OR REPLACE REAR SPEED SENSOR
OK -- Continue to next step.

15. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR SPEED SENSOR)

(a) Install the rear speed sensor Installation.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(c) Disconnect the skid control ECU (brake actuator assembly) connector and the rear speed sensor 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.

16. RECONFIRM DTC

(a) Reconnect the skid control ECU (brake actuator assembly) connector and the rear speed sensor connector.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the ignition switch off.

(d) Start the engine.

(e) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.

(f) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- CHECK FOR INTERMITTENT PROBLEMS
A -- Continue to next step.

17. REPLACE REAR SPEED SENSOR

(a) Turn the ignition switch off.

(b) Replace the rear speed sensor Removal.

NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.

NEXT -- Continue to next step.

18. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) Start the engine.

(d) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- END
A -- Continue to next step.

19. REPLACE REAR SPEED SENSOR ROTOR

(a) Turn the ignition switch off.

(b) Replace the rear speed sensor rotor Removal.

HINT
If the rear speed sensor rotor needs to be replaced, replace the rear axle hub and bearing assembly.

NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.

NEXT -- Continue to next step.

20. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) Start the engine.

(d) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- END

A -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
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