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 and store system information 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 pressures are the same.

Result:

B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)

C -- REPLACE TIRES SO THAT ALL FOUR TIRES ARE SAME SIZE
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 or the rear speed sensor rotor Removal for front, or Removal for rear).

(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.
- 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.

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

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

(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 the 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 Front RH
for Rear RH
for Front LH
for Rear LH

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

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

5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - 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 connector.

(c) Disconnect the skid control ECU connector.

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

Standard Resistance:

for Front RH
for Rear RH
for Front LH
for Rear LH

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

6. 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 Front RH
for Rear RH
for Front LH
for Rear LH

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

7. RECONFIRM DTC

(a) Turn the engine 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:

B -- CHECK FOR INTERMITTENT PROBLEMS Electronic Circuit Inspection Procedure
A -- Continue to next step.

8. REPLACE SPEED SENSOR

(a) Turn the engine 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.

9. 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.

10. REPLACE SPEED SENSOR ROTOR

(a) Turn the engine switch off.

(b) Replace the front axle hub sub-assembly (front speed sensor rotor) or the rear axle hub and bearing assembly (rear speed sensor rotor) Removal for front, or Removal for rear).

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.
- 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.

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) 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

12. 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 front speed sensor connector and 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.

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

(a) Reconnect the skid control sensor wire.

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

14. 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

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

15. RECONFIRM DTC

(a) Turn the engine switch off.

(b) Reconnect the front speed sensor connector.

(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:

B -- CHECK FOR INTERMITTENT PROBLEMS Electronic Circuit Inspection Procedure
A -- Continue to next step.

16. REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR

(a) Turn the engine switch off.

(b) Replace the front speed sensor and the front axle hub sub-assembly (front speed sensor rotor) Removal.

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 with front speed sensor.

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

NEXT -- Continue to next step.

17. 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