C1278
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1273,C1274,C1277,C1278: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1278 - Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)
DESCRIPTION
DTCs C1273 to C1278 will be cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs from C1273 to C1278 are output only in Test Mode.
HINT
* DTCs C1273 and C1277 are for the rear speed sensor RH.
* DTCs C1274 and C1278 are for the rear speed sensor LH.
WIRING DIAGRAM
Refer to DTCs C1403 and C1404 C1403.
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration Component Tests and General Diagnostics.
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (RR/RL Speed Open)
(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC Check For Intermittent Problems.
ABS/VSC/TRAC:
Result:
HINT
Perform the above inspection before removing the sensor and connector.
C -- CHECK SKID CONTROL SENSOR/REAR SPEED SENSOR INSTALLATION
B -- READ VALUE USING TECHSTREAM (RR/RL WHEEL SPEED)
A -- Continue to next step.
2. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)
(a) Turn the ignition switch off.
(b) Repair or replace the harness or connector.
(c) Check for any momentary interruption between the skid control ECU and the rear speed sensor Check For Intermittent Problems.
(d) Check that there are no momentary interruptions.
NEXT -- Continue to next step.
3. PERFORM TEST MODE (SIGNAL CHECK)
(a) Turn the ignition switch off.
(b) Perform the sensor check in the Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are cleared.
NG -- READ VALUE USING TECHSTREAM (RR/RL WHEEL SPEED)
OK -- END
4. READ VALUE USING TECHSTREAM (RR/RL WHEEL SPEED)
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Start the engine.
(d) Select the Data List mode on the Techstream Data List / Active Test.
ABS/VSC/TRAC:
(e) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.
HINT
Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart Component Tests and General Diagnostics.
OK:
The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
NG -- CHECK SKID CONTROL SENSOR/REAR SPEED SENSOR INSTALLATION
OK -- Continue to next step.
5. PERFORM TEST MODE (SIGNAL CHECK)
(a) Turn the ignition switch off.
(b) Perform the sensor check in the Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are cleared.
NG -- CHECK SKID CONTROL SENSOR/REAR SPEED SENSOR INSTALLATION
OK -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting
6. CHECK SKID CONTROL SENSOR/REAR SPEED SENSOR INSTALLATION
(a) Turn the ignition switch off.
(b) for 2WD:
Check the skid control sensor installation.
OK:
There is no clearance between the sensor and the rear axle carrier.
(c) for 4WD:
Check the rear speed sensor installation.
OK:
There is no clearance between the sensor and the rear axle carrier.
The installation bolt is tightened properly.
Torque
8.5 N*m (87 kgf*cm, 75 in.*lbf)
Result:
D -- INSTALL REAR SPEED SENSOR CORRECTLY Installation
C -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Removal
B -- INSPECT SKID CONTROL SENSOR/REAR SPEED SENSOR
A -- Continue to next step.
7. CHECK REAR SPEED SENSOR TIP
(a) Remove the rear speed sensor Removal.
(b) Check the speed sensor tip.
OK:
No scratches, oil, or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
NG -- CLEAN OR REPLACE REAR SPEED SENSOR
OK -- Continue to next step.
8. CHECK REAR SPEED SENSOR ROTOR
(a) Remove the rear axle hub and bearing assembly Removal.
(b) Check the speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
HINT
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.
NG -- CLEAN OR REPLACE REAR SPEED SENSOR ROTOR
OK -- Continue to next step.
9. INSPECT SKID CONTROL SENSOR/REAR SPEED SENSOR
(a) for 4WD:
Install the rear speed sensor and rear speed sensor rotor.
(b) Make sure that there is no looseness in the locking part and connecting part of the connector.
(c) Disconnect the sensor connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Result:
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
D -- REPLACE REAR SPEED SENSOR Removal
C -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Removal
B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL SENSOR/REAR SPEED SENSOR)
A -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)
(a) Make sure that there is no looseness in the locking part and 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
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NG -- REPLACE SKID CONTROL SENSOR WIRE Removal
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL SENSOR/REAR SPEED SENSOR)
(a) for 2WD:
Reconnect the skid control sensor wire.
(b) Make sure that there is no looseness in the locking part and connecting part of the connector.
(c) Disconnect the skid control ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 2WD RH
for 4WD RH
for 2WD LH
for 4WD LH
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
12. INSPECT SKID CONTROL ECU (SENSOR INPUT)
(a) Reconnect the skid control ECU connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for 2WD RH
for 4WD RH
for 2WD LH
for 4WD LH
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- Continue to next step.
13. PERFORM TEST MODE (SIGNAL CHECK)
(a) Turn the ignition switch off.
(b) Perform the sensor check in the Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are cleared.
Result:
C -- REPLACE REAR SPEED SENSOR
B -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting
14. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY
(a) Turn the ignition switch off.
(b) Replace the rear axle hub and bearing assembly (rear speed sensor and 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.
15. PERFORM TEST MODE (SIGNAL CHECK)
(a) Perform the sensor check in the Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are cleared.
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- END
16. REPLACE REAR SPEED SENSOR
(a) Turn the ignition switch off.
(b) Replace the rear speed sensor Removal.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
17. PERFORM TEST MODE (SIGNAL CHECK)
(a) Perform the sensor check in the Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are cleared.
NG -- REPLACE REAR SPEED SENSOR ROTOR
OK -- END
18. REPLACE REAR SPEED SENSOR ROTOR
(a) Turn the ignition switch off.
(b) Replace the rear axle hub and bearing assembly (rear speed sensor rotor) Removal.
HINT
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
19. PERFORM TEST MODE (SIGNAL CHECK)
(a) Perform the sensor check in the Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are cleared.
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- END