C1337

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1337/37: Different Diameter Tire Malfunction



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.






WIRING DIAGRAM









INSPECTION PROCEDURE
NOTE: When replacing the brake actuator assembly, perform zero point calibration. Calibration

PROCEDURE

1. CHECK TIRE SIZE
(a) Check tire size and condition of all 4 wheels .
OK:
All 4 tires are the same size.
NG -- REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME IN SIZE
OK -- Continue to next step.
2. INSPECT SPEED SENSOR ROTOR
(a) Inspect the front speed sensor rotor C0200, and rear speed sensor rotor C0210.
OK:
No scratches, missing teeth or foreign matter on the rotors.
Result:






E -- REPLACE REAR DRIVE SHAFT ASSEMBLY
D -- REPLACE REAR DRIVE SHAFT ASSEMBLY
C -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY
B -- REPLACE FRONT DRIVE SHAFT ASSEMBLY
A -- Continue to next step.
3. INSPECT SPEED SENSOR
(a) Front
(1) Make sure that there is no looseness at the locking part and connecting part of connector.
(2) Disconnect the front speed sensor connector.





(3) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH






RH






(4) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH






RH






(b) Rear for 2WD
(1) Disconnect the rear speed sensor connector.





(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH






RH






(3) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH






RH






(c) Rear for 4WD
(1) Remove the seat cushion seatback.
(2) Disconnect the rear speed sensor connector.





(3) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH






RH






(4) Measure the resistance according to the value(s) in the table below
Standard resistance:
LH






RH






Result:





NOTE: Check the speed sensor signal after replacement. Test Mode Procedure

D -- REPLACE REAR SPEED SENSOR
C -- REPLACE REAR SPEED SENSOR
B -- REPLACE FRONT SPEED SENSOR
A -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR)
(a) Front
(1) Disconnect the skid control ECU connector and the front speed sensor connector.





(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH






RH






(3) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH






RH






(b) Rear
(1) Disconnect the skid control ECU connector and the rear speed sensor connector.





(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH






RH






(3) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH







RH






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (SPEED SENSOR CIRCUIT)
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTCs .
(b) Drive the vehicle at a speed of approximately 20 mph (32 km/h) or more for 60 seconds or more.
(c) Check if the same DTC is detected .
HINT: Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result:






B -- END
A -- REPLACE BRAKE ACTUATOR ASSEMBLY