DTC C1337/91: Diameter of the Tire is not Uniform [09/2015 - 08/2019]: Description

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1337/91	Diameter of the Tire is not Uniform	When the following continues for 36 seconds or more: At a vehicle speed of 30 km/h (18.6 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 speed sensor Front skid control sensor wire (w/ AVS) Rear No. 1 skid control sensor wire (w/ AVS) Front speed sensor rotor (Front axle hub sub-assembly) Rear speed sensor rotor (Rear axle hub and bearing assembly) Wire harness and connector Skid control ECU (Brake actuator assembly) 4WD ECU assembly