DTC C1337: Diameter of the Tire is not Uniform [11/2016 - ]: Procedure

CHECK TIRES
1. Check the size and condition of all four wheels.
  Refer to INSPECTION [11/2016 - ]
  
  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.
Result:

NG

REPLACE TIRES SO THAT ALL FOUR TIRES ARE SAME SIZE

Result:

OK

Go to next step

READ VALUE USING TECHSTREAM (SPEED SENSOR)

Connect the Techstream to the DLC3.
Start the engine.

Select the Data List using the Techstream.

Refer to DATA LIST / ACTIVE TEST [11/2016 - ]

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Wheel Speed	Front wheel speed sensor RH reading	Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations
FL Wheel Speed	Front wheel speed sensor LH reading	Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations
RR Wheel Speed	Rear wheel speed sensor RH reading	Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations
RL Wheel Speed	Rear wheel speed sensor LH reading	Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations

Chassis > ABS/VSC/TRAC > Data List

Tester Display
FR Wheel Speed
FL Wheel Speed
RR Wheel Speed
RL Wheel Speed

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.

Refer to ON-VEHICLE INSPECTION [11/2016 - ]

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

Result	Proceed to
OK	A
NG (for front)	B
NG (for rear 2WD)	C
NG (for rear AWD)	D

Result:

See step 4

Result:

See step 12

Result:

See step 18

Result:

Go to next step

PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

Turn the ignition switch off.

Perform the sensor check using the Test Mode procedure.

Refer to TEST MODE PROCEDURE [11/2016 - ]

Chassis > ABS/VSC/TRAC > Utility

Tester Display
Signal Check

All Test Mode DTCs are not output.

Result	Proceed to
OK	A
NG (for front)	B
NG (for rear 2WD)	C
NG (for rear AWD)	D

Result:

USE SIMULATION METHOD TO CHECK.

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ]

Result:

See step 4

Result:

See step 12

Result:

See step 18

CHECK FRONT SPEED SENSOR AND SENSOR ROTOR
1. Turn the ignition switch off.
2. Remove the front speed sensor and the component with the sensor rotor.
  for speed sensor: Refer to REMOVAL [12/2013 - ]
  
  for sensor rotor (for 1AR-FE): Refer to REMOVAL [12/2013 - ]
  
  for sensor rotor (for 2GR-FKS): Refer to REMOVAL [11/2016 - ]
3. Check the speed sensor tip and speed sensor rotor.
  OK
  
  No scratches, oil, or foreign matter on the sensor tip and rotor.
  NOTE:
  - 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.
    Refer to TEST MODE PROCEDURE [11/2016 - ]
Result:

NG

CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

Result:

OK

Go to next step

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

Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A85 skid control ECU (brake actuator assembly) connector.
Disconnect the A35 or A34 front speed sensor connector.

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

Standard Resistance

FRONT SPEED SENSOR CONNECTOR RH

Tester Connection	Condition	Specified Condition
A85-31 (FR+) - A35-2 (FR+)	Always	Below 1 Ω
A85-31 (FR+) or A35-2 (FR+) - Body ground	Always	10 kΩ or higher
A85-30 (FR-) - A35-1 (FR-)	Always	Below 1 Ω
A85-30 (FR-) or A35-1 (FR-) - Body ground	Always	10 kΩ or higher

FRONT SPEED SENSOR CONNECTOR LH

Tester Connection	Condition	Specified Condition
A85-18 (FL+) - A34-2 (FL+)	Always	Below 1 Ω
A85-18 (FL+) or A34-2 (FL+) - Body ground	Always	10 kΩ or higher
A85-17 (FL-) - A34-1 (FL-)	Always	Below 1 Ω
A85-17 (FL-) or A34-1 (FL-) - Body ground	Always	10 kΩ or higher

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

Go to next step

INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

Reconnect the A85 skid control ECU (brake actuator assembly) connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*A	RH
*B	LH
*a	Front view of wire harness connector (to Front Speed Sensor)

Turn the ignition switch to ON.

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

Standard Voltage

BODY GROUND FOR RH SIDE

Tester Connection	Condition	Specified Condition
A35-2 (FR+) - Body ground	Ignition switch ON	5.7 to 14 V

BODY GROUND FOR LH SIDE

Tester Connection	Condition	Specified Condition
A34-2 (FL+) - Body ground	Ignition switch ON	5.7 to 14 V

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [11/2016 - ]

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY.

Refer to REMOVAL [11/2016 - ]

Result:

Go to next step

RECONFIRM DTC

Turn the ignition switch off.
Reconnect the A35 or A34 front speed sensor connector.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1337 is output.	A
DTC C1337 is not output.	B

Result:

USE SIMULATION METHOD TO CHECK.

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ]

Result:

Go to next step

REPLACE FRONT SPEED SENSOR
1. Turn the ignition switch off.
2. Replace the front speed sensor.
  Refer to REMOVAL [12/2013 - ]
  
  NOTE:
  Check the speed sensor signal after replacement.
  
  Refer to TEST MODE PROCEDURE [11/2016 - ]
NEXT

Go to next step

RECONFIRM DTC

Turn the ignition switch off.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1337 is output.	A
DTC C1337 is not output.	B

Result:

END

Result:

Go to next step

REPLACE FRONT DRIVE SHAFT ASSEMBLY
1. Turn the ignition switch off.
2. Replace the front speed sensor rotor (front drive shaft assembly).
  for 1AR-FE: Refer to REMOVAL [12/2013 - ]
  
  for 2GR-FKS: Refer to REMOVAL [11/2016 - ]
  
  NOTE:
  Check the speed sensor signal after replacement.
  
  Refer to TEST MODE PROCEDURE [11/2016 - ]
  
  HINT:
  
  If the front speed sensor rotor needs to be replaced, replace the front drive shaft assembly.
NEXT

Go to next step

RECONFIRM DTC

Turn the ignition switch off.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1337 is output.	A
DTC C1337 is not output.	B

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY.

Refer to REMOVAL [11/2016 - ]

Result:

END

INSPECT SKID CONTROL SENSOR WIRE

Turn the ignition switch off.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*A	RH
*B	LH
*a	Front view of Skid Control Sensor Wire
*b	Front view of wire harness connector (to Sensor Side Connector)
*c	Front view of wire harness connector (to Vehicle Side Connector)

Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Remove the skid control sensor wire.

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

Standard Resistance

FOR RH SIDE

Tester Connection	Condition	Specified Condition
o1-2 (RR+) - Oo1-2 (RR+)	Always	Below 1 Ω
o1-2 (RR+) - Oo1-1 (RR-)	Always	10 kΩ or higher
o1-2 (RR+) or Oo1-2 (RR+) - Body ground	Always	10 kΩ or higher
o1-1 (RR-) - Oo1-1 (RR-)	Always	Below 1 Ω
o1-1 (RR-) - Oo1-2 (RR+)	Always	10 kΩ or higher
o1-1 (RR-) or Oo1-1 (RR-) - Body ground	Always	10 kΩ or higher

FOR LH SIDE

Tester Connection	Condition	Specified Condition
r1-2 (RL+) - Or1-3 (RL+)	Always	Below 1 Ω
r1-2 (RL+) - Or1-1 (RL-)	Always	10 kΩ or higher
r1-2 (RL+) or Or1-3 (RL+) - Body ground	Always	10 kΩ or higher
r1-1 (RL-) - Or1-1 (RL-)	Always	Below 1 Ω
r1-1 (RL-) - Or1-3 (RL+)	Always	10 kΩ or higher
r1-1 (RL-) or Or1-1 (RL-) - Body ground	Always	10 kΩ or higher

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [11/2016 - ]

Result:

REPLACE SKID CONTROL SENSOR WIRE.

Refer to REMOVAL [12/2013 - ]

Result:

Go to next step

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE)

Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A85 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance

FOR RH SIDE

Tester Connection	Condition	Specified Condition
A85-16 (RR+) - Oo1-2 (RR+)	Always	Below 1 Ω
A85-16 (RR+) or Oo1-2 (RR+) - Body ground	Always	10 kΩ or higher
A85-15 (RR-) - Oo1-1 (RR-)	Always	Below 1 Ω
A85-15 (RR-) or Oo1-1 (RR-) - Body ground	Always	10 kΩ or higher

FOR LH SIDE

Tester Connection	Condition	Specified Condition
A85-29 (RL+) - Or1-3 (RL+)	Always	Below 1 Ω
A85-29 (RL+) or Or1-3 (RL+) - Body ground	Always	10 kΩ or higher
A85-28 (RL-) - Or1-1 (RL-)	Always	Below 1 Ω
A85-28 (RL-) or Or1-1 (RL-) - Body ground	Always	10 kΩ or higher

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

Go to next step

INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

Reconnect the A85 skid control ECU (brake actuator assembly) connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*A	RH
*B	LH
*a	Front view of wire harness connector (to Skid Control Sensor Wire)

Turn the ignition switch to ON.

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

Standard Voltage

FOR RH SIDE

Tester Connection	Condition	Specified Condition
Oo1-2 (RR+) - Body ground	Ignition switch ON	5.7 to 14 V

FOR LH SIDE

Tester Connection	Condition	Specified Condition
Or1-3 (RL+) - Body ground	Ignition switch ON	5.7 to 14 V

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [11/2016 - ]

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY.

Refer to REMOVAL [11/2016 - ]

Result:

Go to next step

RECONFIRM DTC

Turn the ignition switch off.
Install the skid control sensor wire.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1337 is output.	A
DTC C1337 is not output.	B

Result:

USE SIMULATION METHOD TO CHECK.

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ]

Result:

Go to next step

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY WITH REAR SPEED SENSOR
1. Turn the ignition switch off.
2. Replace the rear speed sensor rotor (rear axle hub and bearing assembly) with rear speed sensor.
  Refer to REMOVAL [12/2013 - ]
  
  NOTE:
  Check the speed sensor signal after replacement.
  
  Refer to TEST MODE PROCEDURE [11/2016 - ]
  
  HINT:
  
  The rear speed sensor rotor and rear speed sensor are 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.
NEXT

Go to next step

RECONFIRM DTC

Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1337 is output.	A
DTC C1337 is not output.	B

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY.

Refer to REMOVAL [11/2016 - ]

Result:

END

CHECK REAR SPEED SENSOR AND SENSOR ROTOR
1. Turn the ignition switch off.
2. Remove the rear speed sensor and the component with the sensor rotor.
  for speed sensor: Refer to REMOVAL [12/2013 - ]
  
  for sensor rotor: Refer to REMOVAL [12/2013 - ]
3. Check the speed sensor tip and speed sensor rotor.
  OK
  
  No scratches, oil, or foreign matter on the sensor tip and rotor.
  NOTE:
  - 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.
    Refer to TEST MODE PROCEDURE [11/2016 - ]
Result:

NG

CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

Result:

OK

Go to next step

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

Install the rear speed sensor and the component with the sensor rotor.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the A85 skid control ECU (brake actuator assembly) connector.
Disconnect the O3 or O2 rear speed sensor connector.

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

Standard Resistance

FOR RH SIDE

Tester Connection	Condition	Specified Condition
A85-16 (RR+) - O3-2 (RR+)	Always	Below 1 Ω
A85-16 (RR+) or O3-2 (RR+) - Body ground	Always	10 kΩ or higher
A85-15 (RR-) - O3-1 (RR-)	Always	Below 1 Ω
A85-15 (RR-) or O3-1 (RR-) - Body ground	Always	10 kΩ or higher

FOR LH SIDE

Tester Connection	Condition	Specified Condition
A85-29 (RL+) - O2-3 (RL+)	Always	Below 1 Ω
A85-29 (RL+) or O2-3 (RL+) - Body ground	Always	10 kΩ or higher
A85-28 (RL-) - O2-1 (RL-)	Always	Below 1 Ω
A85-28 (RL-) or O2-1 (RL-) - Body ground	Always	10 kΩ or higher

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

Go to next step

INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

Reconnect the A85 skid control ECU (brake actuator assembly) connector.

*A	RH
*B	LH
*a	Front view of wire harness connector (to Rear Speed Sensor)

Turn the ignition switch to ON.

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

Standard Voltage

FOR RH SIDE

Tester Connection	Condition	Specified Condition
O3-2 (RR+) - Body ground	Ignition switch ON	5.7 to 14 V

FOR LH SIDE

Tester Connection	Condition	Specified Condition
O2-3 (RL+) - Body ground	Ignition switch ON	5.7 to 14 V

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [11/2016 - ]

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY.

Refer to REMOVAL [11/2016 - ]

Result:

Go to next step

RECONFIRM DTC

Turn the ignition switch off.
Reconnect the O3 or O2 rear speed sensor connector.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1337 is output.	A
DTC C1337 is not output.	B

Result:

USE SIMULATION METHOD TO CHECK.

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ]

Result:

Go to next step

REPLACE REAR SPEED SENSOR
1. Turn the ignition switch off.
2. Replace the rear speed sensor.
  Refer to REMOVAL [12/2013 - ]
  
  NOTE:
  Check the speed sensor signal after replacement.
  
  Refer to TEST MODE PROCEDURE [11/2016 - ]
NEXT

Go to next step

RECONFIRM DTC

Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1337 is output.	A
DTC C1337 is not output.	B

Result:

END

Result:

Go to next step

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY
1. Turn the ignition switch off.
2. Replace the rear speed sensor rotor (rear axle hub and bearing assembly).
  Refer to REMOVAL [12/2013 - ]
  
  NOTE:
  Check the speed sensor signal after replacement.
  
  Refer to TEST MODE PROCEDURE [11/2016 - ]
  
  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.
NEXT

Go to next step

RECONFIRM DTC

Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [11/2016 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1337 is output.	A
DTC C1337 is not output.	B

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY.

Refer to REMOVAL [11/2016 - ]

Result:

END