C1277
BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1235/35,C1236/36,C1238/38,C1239/39,C1275/75-C1278/78: Foreign Object is Attached on Tip of Front Speed Sensor RH
DESCRIPTION
Refer to DTCs C0200/31 and C0205/32 C0200.
DTCs C1275/75 to C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1275/75 to C1278/78 are output only in the Test Mode.
HINT
- DTC C1235/35 and C1275/75 are for the front speed sensor RH.
- DTC C1236/36 and C1276/76 are for the front speed sensor LH.
- DTC C1238/38 and C1277/77 are for the rear speed sensor RH.
- DTC C1239/39 and C1278/78 are for the rear speed sensor LH.
WIRING DIAGRAM
Refer to DTCs C0200/31 and C0205/32 C0200 or DTCs C0210/33 and C0215/34 C0210.
INSPECTION PROCEDURE
NOTICE:
When replacing the skid control ECU, perform the following operations:
- Initialization of linear solenoid valve and calibration Initialization
- Yaw rate and acceleration sensor zero point calibration Calibration
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR WIRE)
(a) Disconnect the A19 and A21 ECU connectors.
(b) Disconnect the A55 and A91 sensor wire connectors.
(c) Disconnect the R56 and S91 sensor wire connectors.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:
for RH
for LH
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK SKID CONTROL ECU (SENSOR INPUT VOLTAGE)
(a) Reconnect the A19 and A21 ECU connectors.
(b) Disconnect the A55 sensor wire connector.
(c) Disconnect the A91 sensor wire connector.
(d) Disconnect the R56 sensor wire connector.
(e) Disconnect the S91 sensor wire connector.
(f) Turn the power switch ON (IG).
(g) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPLACE SKID CONTROL ECU Removal
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the power switch ON (READY).
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for 60 seconds or more.
(d) Check if the same DTCs are recorded Reading and Clearing Diagnostic Trouble Codes.
HINT
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.
Result
B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.
4. INSPECT SPEED SENSOR TIP
(a) Remove the front speed sensor Removal and rear speed sensor Removal.
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
Result
C -- CLEAN OR REPLACE REAR SPEED SENSOR Removal
B -- CLEAN OR REPLACE FRONT SPEED SENSOR Removal
A -- Continue to next step.
5. INSPECT SPEED SENSOR ROTOR
(a) Remove the front axle hub and bearing (speed sensor rotor) Removal.
(b) Remove the rear axle hub and bearing (speed sensor rotor) Removal.
(c) Check each sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
HINT
If the sensor rotor is damaged, replace the front or rear axle hub bearing assembly.
NOTICE:
- Do not use any kind of cleaner when cleaning the speed sensor rotor.
- Check the speed sensor signal after cleaning/replacement Test Mode Procedure.
Result
C -- CLEAN OR REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (SPEED SENSOR ROTOR) Removal
B -- CLEAN OR REPLACE FRONT AXLE HUB AND BEARING ASSEMBLY (SPEED SENSOR ROTOR) Removal
A -- Continue to next step.
6. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the power switch ON (READY).
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for 60 seconds or more.
(d) Check if the same DTCs are recorded Reading and Clearing Diagnostic Trouble Codes.
HINT
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.
Result
B -- REPLACE SKID CONTROL ECU Removal
A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting