Diagnostic trouble code C1337 Land Cruiser

DESCRIPTION

INSPECTION PROCEDURE

CHECK TIRE SIZE

INSPECT SPEED SENSOR ROTOR

INSPECT SPEED SENSOR

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

RECONFIRM DTC

DTC C1337/37 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.

DTC Code DTC Detection Condition Trouble Area
C1337/37 When either of the following conditions is detected:
  1. The diameter is different between the 2 front wheels and the 2 rear wheels.
  2. There is a wheel speed sensor fault.
  1. Speed sensor
  2. Speed sensor rotor
  3. Speed sensor circuit
  4. Tire size

Inspection procedure

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration .

1.CHECK TIRE SIZE

  1. Check tire size and condition of all 4 wheels.

    OK:

    Condition of all 4 wheels is normal and tire size is same.

  NG  
REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME SIZE
 
OK  
   

2.INSPECT SPEED SENSOR ROTOR

  1. Check the front speed sensor rotors and rear speed sensor rotors .

    Result
    Result Proceed to
    OK A
    NG Front speed sensor B
    Rear speed sensor C
  B  
REPLACE FRONT AXLE WITH ABS ROTOR BEARING ASSEMBLY (SPEED SENSOR ROTOR)
 
  C  
REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (SPEED SENSOR ROTOR)
 
A  
   

3.INSPECT SPEED SENSOR

  1. Check the front speed sensor circuit and rear speed sensor circuit .

    Result
    Result Proceed to
    OK A
    NG Front speed sensor B
    Rear speed sensor C
  B  
REPLACE FRONT SPEED SENSOR
 
  C  
REPLACE REAR SPEED SENSOR
 
A  
   

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

  1. Check the front speed sensor circuit and rear speed sensor circuit .

  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   

5.RECONFIRM DTC

  1. Clear the DTCs .

  1. Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.

  1. Check if the same DTCs are output .

    HINT:

    Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

    Result
    Result Proceed to
    DTC is not output A
    DTC is output LHD B
    RHD C
  B  
REPLACE MASTER CYLINDER SOLENOID
 
  C  
REPLACE MASTER CYLINDER SOLENOID
 
A  
   
USE SIMULATION METHOD TO CHECK