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C1237





BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1237, C1275-C1278: Speed Sensor Rotor Faulty
C1278 - Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The skid control ECU 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

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 On-Vehicle Inspection.

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 AND SENSOR ROTOR

C -- INSPECT SKID CONTROL SENSOR WIRE
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 AND SENSOR ROTOR

C -- INSPECT SKID CONTROL SENSOR WIRE
A -- Continue to next step.

4. RECONFIRM DTC

(a) Turn the ignition switch off.

(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 -- REPLACE FRONT SPEED SENSOR

C -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting

5. CHECK FRONT SPEED SENSOR AND SENSOR ROTOR

(a) Remove the front speed sensor and the component with the sensor rotor Removal for speed sensor, Removal 2GR-FE for sensor rotor, and/or Removal 2AR-FE for sensor rotor).

(b) Check the speed sensor tip and speed sensor rotor.

OK:

No scratches, oil, or foreign matter on the sensor tip and rotor.

NOTICE:
* If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.
If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.
* Check the speed sensor signal after cleaning or replacement Test Mode Procedure.

NG -- CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

(a) Install the front speed sensor and the component with the sensor rotor.

(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 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.

7. RECONFIRM DTC

(a) Reconnect the skid control ECU 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 How To Proceed With Troubleshooting
A -- Continue to next step.

8. 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.

9. 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.

10. REPLACE FRONT DRIVE OUTBOARD JOINT SHAFT ASSEMBLY

(a) Turn the ignition switch off.

(b) Replace the front speed sensor rotor (front drive outboard joint shaft assembly) Removal for 2GR-FE, or Removal for 2AR-FE).

HINT
If the front speed sensor rotor needs to be replaced, replace the front drive outboard joint shaft assembly.

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

NEXT -- Continue to next step.

11. 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

12. INSPECT SKID CONTROL SENSOR WIRE

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





(b) Remove the skid control sensor wire.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for RH
for LH










Text in Illustration





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

NG -- REPLACE SKID CONTROL SENSOR WIRE Removal
OK -- Continue to next step.

13. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL SENSOR WIRE)

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

(b) Disconnect the skid control ECU connector.

(c) 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.

14. RECONFIRM DTC

(a) Install the skid control sensor wire.

(b) Reconnect the skid control ECU connector.

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

(d) Turn the ignition switch off.

(e) Start the engine.

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

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

Result:





B -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting
A -- Continue to next step.

15. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

(a) Turn the ignition switch off.

(b) Replace the rear speed sensor rotor with rear speed sensor (rear axle hub and bearing assembly) Removal.

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 the rear axle hub and bearing assembly with rear speed sensor.

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

NEXT -- Continue to next step.

16. 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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