C1278

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1415,C1277,C1278,C1416: Rear Speed Sensor RH Output Malfunction


DESCRIPTION

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for brake control.

The speed sensor rotors have rows of alternating N and S magnetic poles and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU.









HINT
- DTCs C1415 and C1277 are for the rear speed sensor RH.
- DTCs C1416 and C1278 are for the rear speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When replacing the master cylinder solenoid, perform calibration Programming and Relearning.
- Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) C1407

NG -- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR) C1403

NG -- CHECK REAR SPEED SENSOR INSTALLATION
OK -- Continue to next step.

3. PERFORM TEST MODE (SIGNAL CHECK)

(a) Turn the engine switch on (IG).

(b) Perform the sensor check in the Test Mode Procedure Test Mode Procedure.

OK:

All test mode DTCs are cleared.

NG -- CHECK REAR SPEED SENSOR INSTALLATION
OK -- Continue to next step.

4. RECONFIRM DTC

(a) Turn the engine switch on (IG).

(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(c) Start the engine.

(d) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE REAR SPEED SENSOR

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

5. CHECK REAR SPEED SENSOR INSTALLATION C1403

NG -- INSTALL REAR SPEED SENSOR CORRECTLY
OK -- Continue to next step.

6. INSPECT REAR SPEED SENSOR TIP C1403

NG -- CLEAN OR REPLACE REAR SPEED SENSOR
OK -- Continue to next step.

7. INSPECT REAR SPEED SENSOR ROTOR C1403

NG -- CLEAN OR REPLACE REAR SPEED SENSOR ROTOR
OK -- Continue to next step.

8. INSPECT SKID CONTROL SENSOR WIRE C1407

NG -- REPLACE SKID CONTROL SENSOR WIRE Removal
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR) C1407

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

10. CHECK TERMINAL VOLTAGE (RR+, RL+) C1407

NG -- REPLACE MASTER CYLINDER SOLENOID Disassembly
OK -- Continue to next step.

11. RECONFIRM DTC

(a) Turn the engine switch on (IG).

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Start the engine.

(d) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE REAR SPEED SENSOR

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

12. REPLACE REAR SPEED SENSOR C1403

NEXT -- Continue to next step.

13. RECONFIRM DTC

(a) Turn the engine switch on (IG).

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Start the engine.

(d) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Disassembly

A -- END