Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Diameter of the Tire is not Uniform (C1337)

DESCRIPTION

The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from the speed sensors. These signals are used for recognizing whether all 4 wheels are operating properly. Therefore, all wheel signals must indicate the same speed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1337

Diameter of the Tire is not Uniform

The following occurs in 3 consecutive trips:

At a vehicle speed of 20 km/h (12 mph) or more, there is a difference of 20% or more in the average speed between the front wheels and rear wheels for 20 seconds or more.

  • Tire and wheel size
  • Tire deformation
  • Skid control rotor
  • Speed sensor
  • Speed sensor circuit
  • Skid control ECU (Brake actuator assembly)

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page PROCEDURE PROCEDURE ).

PROCEDURE

1.

CHECK DTC

(a) Check if any DTCs relating to the speed sensor circuit are output (See page Result ).

Result

Result

Proceed to

DTC is not output

A

DTC is output

B

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

2.

CHECK TIRE SIZE

(a) Check the tire size and condition of all 4 wheels.

OK:

All 4 tires are the same size and in the same condition.

NG

REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME SIZE AND IN THE SAME CONDITION

OK

3.

RECONFIRM DTC

(a) Clear the DTC (See page ). (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(c) Perform the following 3 times:

Turn the ignition switch to ON and start the engine, drive the vehicle at a speed of 30 km/h (19 mph) or more for at least 30 seconds, and then stop the vehicle and turn the ignition switch off.

(d) Check if the same DTC is output (See page ). Result ).

Result

Result

Proceed to

DTC is output

A

DTC is not output

B

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

USE SIMULATION METHOD TO CHECK

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