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C1277





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 deleted 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 Check for Intermittent Problems.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using 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 REAR SPEED SENSOR INSTALLATION

B -- READ VALUE ON TECHSTREAM (REAR SPEED SENSOR)
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 Scan Tool Testing and Procedures.

OK:

All Test Mode DTCs are erased.

NG -- READ VALUE ON TECHSTREAM (REAR SPEED SENSOR)

OK -- END

4. READ VALUE ON TECHSTREAM (REAR SPEED SENSOR)

(a) Turn the ignition switch off.

(b) Connect Techstream to the DLC3.

(c) Start the engine.

(d) Select the Data List mode on 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 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 On-Vehicle inspection.

OK:

The speed value output from the speed sensor displayed on Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

NG -- CHECK 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 Scan Tool Testing and Procedures.

OK:

All Test Mode DTCs are erased.

NG -- CHECK REAR SPEED SENSOR INSTALLATION

OK -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System

6. CHECK REAR SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.





(b) Check the speed sensor installation (for 2WD).

OK:

There is no clearance between the sensor and the rear axle carrier.

(c) Check the speed sensor installation (for 4WD).

OK:

There is no clearance between the sensor and the rear axle carrier.

The installation nut is tightened properly.

Torque
8.0 N*m (82 kgf*cm, 71 in.*lbf)

Result:





D -- INSTALL REAR SPEED SENSOR CORRECTLY (for 4WD) Installation

C -- INSTALL REAR SPEED SENSOR CORRECTLY (for 2WD) Installation

B -- INSPECT 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 Scan Tool Testing and Procedures.

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

8. CHECK REAR SPEED SENSOR ROTOR

(a) Remove the rear speed sensor rotor for TMC made, or for except TMC made).

(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 Scan Tool Testing and Procedures.

HINT
If the rear speed sensor rotor needs to be replaced, replace it together with the outboard joint shaft assembly.

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

9. INSPECT REAR SPEED SENSOR

(a) Install the rear speed sensor and the rear speed sensor rotor.





(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(c) Disconnect the rear speed sensor 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


















Result:





NOTICE:
Check the speed sensor signal after replacement Scan Tool Testing and Procedures.

D -- REPLACE REAR SPEED SENSOR (for 4WD) Removal

C -- REPLACE REAR SPEED SENSOR (for 2WD) Removal

B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - 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 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










NOTICE:
Check the speed sensor signal after replacement Scan Tool Testing and Procedures.

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

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

(a) Reconnect the skid control sensor wire (for 2WD).





(b) Make sure that there is no looseness at the locking part and the 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 on (IG).

(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 Scan Tool Testing and Procedures.

OK:

All Test Mode DTCs are erased.

Result:





C -- REPLACE REAR SPEED SENSOR

B -- REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System

14. REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

(a) Turn the ignition switch off.

(b) Replace the rear speed sensor Removal.

(c) Replace 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 Scan Tool Testing and Procedures.

NEXT -- Continue to next step.

15. PERFORM TEST MODE (SIGNAL CHECK)

(a) Perform the sensor check in the Test Mode procedure Scan Tool Testing and Procedures.

OK:

All Test Mode DTCs are erased.

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 Scan Tool Testing and Procedures.

NEXT -- Continue to next step.

17. PERFORM TEST MODE (SIGNAL CHECK)

(a) Perform the sensor check in the Test Mode procedure Scan Tool Testing and Procedures.

OK:

All Test Mode DTCs are erased.

NG -- REPLACE REAR SPEED SENSOR ROTOR

OK -- END

18. REPLACE REAR SPEED SENSOR ROTOR

(a) Turn the ignition switch off.

(b) Remove the rear drive shaft assembly for TMC made, or for except TMC made).

(c) Replace the outboard joint shaft assembly (rear speed sensor rotor) for TMC made, or for except TMC made).

HINT
If the rear speed sensor rotor needs to be replaced, replace it together with the outboard joint shaft assembly.

NOTICE:
Check the speed sensor signal after replacement Scan Tool Testing and Procedures.

NEXT -- Continue to next step.

19. PERFORM TEST MODE (SIGNAL CHECK)

(a) Install the rear drive shaft assembly.

(b) Perform the sensor check in the Test Mode procedure Scan Tool Testing and Procedures.

OK:

All Test Mode DTCs are erased.

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

OK -- END
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