Dtc C1277 Abnormal Change In Output Signal Of Rear Speed Sensor Rh (Test Mode Dtc)

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

PERFORM TEST MODE (SIGNAL CHECK)

RECONFIRM DTC

CHECK REAR SPEED SENSOR INSTALLATION

INSPECT SKID CONTROL SENSOR WIRE

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

INSPECT SKID CONTROL ECU (SENSOR INPUT)

RECONFIRM DTC

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (REAR SPEED SENSOR, SENSOR ROTOR)

RECONFIRM DTC

DTC C1277 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)

DTC C1278 Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DTC C1415 Rear Speed Sensor RH Output Malfunction

DTC C1416 Rear Speed Sensor LH Output Malfunction


DESCRIPTION

Refer to DTCs C1403 and C1404 (YARIS_NCP93 RM00000369R03UX.html).

DTC No.
DTC Detection Condition
Trouble Area
C1415
C1416
Any of the following is detected:
  1. An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more.
  2. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds.
  3. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.
  1. Rear speed sensor RH/LH
  2. Speed sensor circuit
  3. Speed sensor rotor
  4. Skid control ECU (Brake actuator assembly)

Test Mode Diagnosis Code
DTC No.
DTC Detection Condition
Trouble Area
C1277
C1278
Detected only during Test Mode.
  1. Rear speed sensor RH/LH
  2. Speed sensor rotor
HINT:
  1. DTC C1415 and C1277 are for the rear speed sensor RH.
  2. DTC C1416 and C1278 are for the rear speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1403 and C1404 (YARIS_NCP93 RM00000369R03UX_02.html).

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR078X.html).
  2. Disassembly of the rear speed sensor from the rear axle hub and bearing assembly is prohibited.
1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (YARIS_NCP93 RM000000XHS0ANX.html).

    ABS/VSC/TRAC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    RR Speed Open
    		RR speed sensor open detection / Normal or Error
    		Normal: Normal
    Error: Momentary interruption
    		-
    RL Speed Open
    		RL speed sensor open detection / Error or Normal or Error
    		Normal: Normal
    Error: Momentary interruption
    		-
    OK:
    There are no momentary interruptions.
    HINT:
    Perform the above inspection before removing the sensor and connector.


NG
Go to step 6
OK


2.READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

  1. According to the display on the Techstream, read the Data List.

    ABS/VSC/TRAC (Skid Control ECU)
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    RR Wheel Speed
    		RR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)
    		Vehicle stopped: 0 km/h
    		When driving at constant speed: No large fluctuations
    RL Wheel Speed
    		RL wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)
    		Vehicle stopped: 0 km/h
    		When driving at constant speed: No large fluctuations

  1. 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 (YARIS_NCP93 RM0000014WB073X.html).
    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).
    NOTICE:
    Check the speed sensor signal after replacement (YARIS_NCP93 RM000000XHT098X.html).
    HINT:
    1. 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.
    2. If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0BRX.html).


NG
Go to step 5
OK


3.PERFORM TEST MODE (SIGNAL CHECK)

  1. Turn the ignition switch off.

  1. Perform the sensor check in the Test Mode procedure (YARIS_NCP93 RM000000XHT098X.html).

    OK:
    All Test Mode DTCs are cleared.


NG
Go to step 5
OK


4.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0CQX.html).

  1. Start the engine.

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

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0CQX.html).

Result
Result
Proceed to
DTCs C1415 and C1416 are not output
A
DTCs C1415 and/or C1416 are output
B
HINT:
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0BRX.html).


B
Go to step 10
A

CHECK INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS0ANX.html)

5.CHECK REAR SPEED SENSOR INSTALLATION

  1. Turn the ignition switch off.



    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1277 Abnormal Change In Output Signal Of Rear Speed Sensor Rh (Test Mode Dtc)

  1. Check the speed sensor installation.

    OK:
    There is no clearance between the sensor and the rear axle hub.
    HINT:
    Because the rear axle hub and bearing assembly cannot be disassembled, if the rear speed sensor needs replacement, replace the rear axle hub and bearing assembly.
Text in Illustration
*a
Normal
*b
Abnormal
*c
Clearance


NG
REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (REAR SPEED SENSOR, SENSOR ROTOR) (YARIS_NCP93 RM000001IWU01CX.html)
OK


6.INSPECT SKID CONTROL SENSOR WIRE

  1. Turn the ignition switch off.

  1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

  1. Disconnect the skid control sensor wire connectors.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (RH):
    Tester Connection
    		Condition
    		Specified Condition
    a10-2(+) - aJ3-1
    		Always
    		Below 1 Ω
    a10-1(-) - aJ3-2
    		Always
    		Below 1 Ω
    a10-2(+) - aJ3-2
    		Always
    		10 kΩ or higher
    a10-2(+) - Body ground
    		Always
    		10 kΩ or higher
    a10-1(-) - aJ3-1
    		Always
    		10 kΩ or higher
    a10-1(-) - Body ground
    		Always
    		10 kΩ or higher
    Standard Resistance (LH):
    Tester Connection
    		Condition
    		Specified Condition
    d10-2(+) - dJ2-1
    		Always
    		Below 1 Ω
    d10-1(-) - dJ2-2
    		Always
    		Below 1 Ω
    d10-2(+) - dJ2-2
    		Always
    		10 kΩ or higher
    d10-2(+) - Body ground
    		Always
    		10 kΩ or higher
    d10-1(-) - dJ2-1
    		Always
    		10 kΩ or higher
    d10-1(-) - Body ground
    		Always
    		10 kΩ or higher
    NOTICE:
    Check the speed sensor signal after replacement (YARIS_NCP93 RM000000XHT098X.html).

  1. Reconnect the skid control sensor wire connector.



NG
REPLACE SKID CONTROL SENSOR WIRE
OK


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

  1. Turn the ignition switch off.

  1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

  1. Disconnect the skid control ECU connector and the rear speed sensor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A70-17 (RR+) - a10-2 (+)
    		Always
    		Below 1 Ω
    A70-16 (RR-) - a10-1 (-)
    		Always
    		Below 1 Ω
    A70-5 (RL+) - d10-2 (+)
    		Always
    		Below 1 Ω
    A70-4 (RL-) - d10-1 (-)
    		Always
    		Below 1 Ω
    A70-17 (RR+) - Body ground
    		Always
    		10 kΩ or higher
    A70-16 (RR-) - Body ground
    		Always
    		10 kΩ or higher
    A70-5 (RL+) - Body ground
    		Always
    		10 kΩ or higher
    A70-4 (RL-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the skid control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.INSPECT SKID CONTROL ECU (SENSOR INPUT)


    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1277 Abnormal Change In Output Signal Of Rear Speed Sensor Rh (Test Mode Dtc)

  1. Turn the ignition switch to ON.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    a10-2 (+) - Body ground
    		Ignition switch ON
    		8 to 14 V
    d10-2 (+) - Body ground
    		Ignition switch ON
    		8 to 14 V
    NOTICE:
    Check the speed sensor signal after replacement (YARIS_NCP93 RM000000XHT098X.html).
    HINT:
    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0BRX.html).
Text in Illustration
*a
Front view of wire harness connector
(to Rear Speed Sensor)

  1. Reconnect the rear speed sensor connector.



NG
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)
OK


9.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0CQX.html).

  1. Start the engine.

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

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0CQX.html).

Result
Result
Proceed to
DTCs C1415 and/or C1416 are output
A
DTCs C1415 and C1416 are not output
B
HINT:
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0BRX.html).


B
CHECK INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS0ANX.html)
A


10.REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (REAR SPEED SENSOR, SENSOR ROTOR)

  1. Turn the ignition switch off.

  1. Replace the rear speed sensor and rear axle hub and bearing assembly (YARIS_NCP93 RM000001IWU01CX.html).

    NOTICE:
    Check the speed sensor signal after replacement (YARIS_NCP93 RM000000XHT098X.html).
    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.

NEXT


11.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0CQX.html).

  1. Start the engine.

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

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0CQX.html).

Result
Result
Proceed to
DTCs C1415 and C1416 are not output
A
DTCs C1415 and/or C1416 are output
B
HINT:
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0BRX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)
A

END