C1237
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1237/37,C1275/75-C1278/78: Speed Sensor Rotor Faulty
DTC C1237/37 - Speed Sensor Rotor Faulty
DTC C1275/75 - Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)
DTC C1276/76 - Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)
DTC C1277/77 - Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)
DTC C1278/78 - Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)
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 four wheels are operating properly.
Therefore, all wheel signals must be equal.
DTCs C1275/75 to C1278/78 will be cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1275/75 to C1278/78 are output only in Test Mode.
HINT:
- DTC C1275/75 is for the front speed sensor RH.
- DTC C1276/76 is for the front speed sensor LH.
- DTC C1277/77 is for the rear speed sensor RH.
- DTC C1278/78 is for the rear speed sensor LH.
WIRING DIAGRAM
for front
for rear
INSPECTION PROCEDURE
HINT: When C0200/31, C0205/32, C0210/33, C0215/34, C1330/35, C1331/36, C1332/38 and/or C1333/39 is output together with C1237/37, inspect and repair the trouble areas indicated by C0200/31, C0205/32, C0210/33, C0215/34, C1330/35, C1331/36, C1332/38 and/or C1333/39 first C0200 for front, or C0210 for rear).
PROCEDURE
1. CHECK TIRES
(a) Check the size and condition of all four wheels Component Tests and General Diagnostics.
HINT: The DTC is output when tire deformation or a difference in tire size is detected.
OK:
The diameter of all four tires and air pressure are the same.
Result:
C -- REPLACE TIRES SO THAT ALL FOUR TIRES ARE THE SAME SIZE
B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)
A -- Continue to next step.
2. CHECK SPEED SENSOR AND SPEED SENSOR ROTOR
(a) Remove the speed sensor and speed sensor rotor Removal for front, or Removal for rear).
(b) Check the speed sensor tip and speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the sensor tip and rotor.
NOTICE: Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
NG -- CLEAN OR REPLACE SPEED SENSOR OR SPEED SENSOR ROTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR)
(a) Install the speed sensor and speed sensor rotor.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(c) Disconnect the skid control ECU connector and the speed sensor connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. RECONFIRM DTC
(a) Reconnect the skid control ECU connector and the speed sensor connector.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Start the engine.
(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- Continue to next step.
5. REPLACE SPEED SENSOR
(a) Turn the ignition switch off.
(b) Replace the speed sensor Removal for front, or Removal for rear).
NOTICE: Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
6. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- Continue to next step.
7. REPLACE SPEED SENSOR ROTOR
(a) Turn the ignition switch off.
(b) Remove the drive shaft assembly Removal for front, or Removal for rear).
(c) Replace the drive outboard joint shaft assembly (speed sensor rotor) Disassembly for front, or Disassembly for rear).
HINT: If the speed sensor rotor needs to be replaced, replace it together with the drive outboard joint shaft assembly.
NOTICE: Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
8. RECONFIRM DTC
(a) Install the drive shaft assembly.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Start the engine.
(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- REPLACE BRAKE ACTUATOR ASSEMBLY
9. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(b) Disconnect the skid control sensor wire.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
Text in Illustration
NOTICE: Check the speed sensor signal after replacement Test Mode Procedure.
NG -- REPLACE SKID CONTROL SENSOR WIRE
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)
(a) Reconnect the skid control sensor wire.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(c) Disconnect the skid control ECU connector and the rear speed sensor connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
11. RECONFIRM DTC
(a) Reconnect the skid control ECU connector and the rear speed sensor connector.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Start the engine.
(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- Continue to next step.
12. REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR
(a) Turn the ignition switch off.
(b) Replace the rear speed sensor and the rear axle hub and bearing assembly (rear speed sensor rotor) Removal.
HINT: The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly with rear speed sensor.
NOTICE: Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
13. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- REPLACE BRAKE ACTUATOR ASSEMBLY