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C1337





BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1337: Diameter of the Tire is not Uniform
C1337 - Diameter of the Tire is not Uniform

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 4 wheels are operating properly.

Therefore, all wheel signals must be equal.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK TIRES

(a) Check the size and condition of all 4 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 4 tires and air pressure are the same.

Result:





C -- REPLACE TIRES SO THAT ALL FOUR TIRES ARE SAME SIZE

B -- INSPECT SPEED SENSOR
A -- Continue to next step.

2. CHECK SPEED SENSOR TIP

(a) Remove the front speed sensor or the rear speed sensor Removal for front, or Removal for rear).

(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 SPEED SENSOR
OK -- Continue to next step.

3. CHECK SPEED SENSOR ROTOR

(a) Remove the front speed sensor rotor Removal for 2GR-FE, or Removal for 1AR-FE).

(b) Remove the rear speed sensor rotor Removal.

(c) 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
* If the front speed sensor rotor needs to be replaced, replace it together with the front drive outboard joint shaft assembly.
* If the rear speed sensor rotor needs to be replaced, replace it together with the outboard joint shaft assembly.

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

4. INSPECT SPEED SENSOR

(a) Install the speed sensor and the speed sensor rotor.





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

(c) Disconnect each speed sensor connector.

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

Standard resistance:

for 2WD RH
for 4WD RH
for 2WD LH
for 4WD LH


















Result:





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

C -- REPLACE SPEED SENSOR

B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR)
A -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)

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





(b) Disconnect the skid control sensor wire.

(c) 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.

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

(a) Reconnect the skid control sensor wire (for 2WD).





(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 connector.

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

Standard resistance:

for 2WD RH
for 4WD RH
for 2WD LH
for 4WD LH


















NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. INSPECT SKID CONTROL ECU (SENSOR INPUT)

(a) Reconnect the skid control ECU connector.





(b) Turn the ignition switch on (IG).

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

Standard voltage:

for 2WD RH
for 4WD RH
for 2WD LH
for 4WD LH


















NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- Continue to next step.

8. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Reconnect the speed sensor connectors.

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

(d) Start the engine.

(e) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

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

Result:





C -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System

B -- REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR
A -- Continue to next step.

9. REPLACE SPEED SENSOR

(a) Turn the ignition switch off.

(b) Replace the front speed sensor or the rear speed sensor Removal for front, or Removal for rear).

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) Start the engine.

(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(d) Check if the same DTC is recorded 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) Remove the front drive shaft assembly Removal for 2GR-FE, or Removal for 1AR-FE).

(c) Replace the front drive outboard joint shaft assembly (front speed sensor rotor) Disassembly for 2GR-FE, or Disassembly for 1AR-FE).

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

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

NEXT -- Continue to next step.

12. REPLACE REAR SPEED SENSOR ROTOR

(a) Remove the rear drive shaft assembly Removal.

(b) Replace the outboard joint shaft assembly (rear speed sensor rotor) Disassembly.

HINT
If the rear speed sensor rotor needs to be replaced, replace it together with the outboard joint shaft assembly.

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

NEXT -- Continue to next step.

13. RECONFIRM DTC

(a) Install the drive shaft assembly.

(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:





B -- END

A -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

14. REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

(a) Turn the ignition switch off.

(b) Replace the rear speed sensor Removal.

(c) Replace the rear axle hub and bearing assembly (rear speed sensor rotor) 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 it together with 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.

15. RECONFIRM DTC

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

(b) Start the engine.

(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- END

A -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
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