DTC C1337: Diameter of the Tire is not Uniform [03/2020 - 10/2020]: Description

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The 4WD ECU assembly outputs this DTC if a difference in tire size is detected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1337	Diameter of the Tire is not Uniform	When the following continues for 36 seconds or more: At a vehicle speed of 30 km/h (19 mph) or more, the average speed difference between the front wheel and rear wheel is 4% or more.	Tire size or pressure (front and rear tires) Speed sensor circuit Front speed sensor Rear skid control sensor Front speed sensor rotor (front axle hub sub-assembly) Rear speed sensor rotor (rear axle hub and bearing assembly) Wire harness or connector Skid control ECU (brake actuator assembly) 4WD ECU assembly