Dtc C1407 Open Or Short In Rear Speed Sensor Rh Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

RECONFIRM DTC

INSPECT SKID CONTROL SENSOR WIRE

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR SPEED SENSOR)

CHECK BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

DTC C1407 Open or Short in Rear Speed Sensor RH Circuit

DTC C1408 Open or Short in Rear Speed Sensor LH Circuit


DESCRIPTION

Refer to DTCs C1403 and C1404 (YARIS_NCP93 RM00000369R03DX.html).

DTC NO.
DTC Detection Condition
Trouble Area
C1407
C1408
Either of the following is detected:
  1. An open in the speed sensor signal circuit continues for 0.5 seconds or more.
  2. With the IG1 terminal voltage 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more.
  1. Rear axle hub and bearing assembly RH/LH
    (rear speed sensor, speed sensor rotor)
  2. Skid control sensor wire
  3. Harness or connector
  4. Brake actuator assembly (skid control ECU)
HINT:
  1. DTC C1407 is for the rear speed sensor RH.
  2. DTC C1408 is for the rear speed sensor LH.

WIRING DIAGRAM


Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1407 Open Or Short In Rear Speed Sensor Rh Circuit


INSPECTION PROCEDURE

NOTICE:
  1. Disassembly of the rear speed sensor from the rear axle hub and bearing assembly is prohibited.
  2. Check the speed sensor signal after replacement (YARIS_NCP93 RM000000XHT08HX.html).
1.READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

  1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (YARIS_NCP93 RM000000XHS09XX.html).

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


NG
Go to step 4
OK


2.READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

  1. Turn the ignition switch off.

  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
    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.
    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).
    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 RM000000XHN0AWX.html).


NG
Go to step 4
OK


3.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0BPX.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 RM000000XHV0BPX.html).

    Result
    Result
    		Proceed to
    DTCs (C1407 and C1408) are not output
    		A
    DTCs (C1407 and/or C1408) 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 RM000000XHN0AWX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000UZ309WX.html)

4.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.



    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1407 Open Or Short In Rear Speed Sensor Rh Circuit

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

    Standard Resistance:
    RH
    Tester Connection
    		Condition
    		Specified Condition
    Z1-2 - ZJ2-1
    		Always
    		Below 1 Ω
    Z1-1 - ZJ2-2
    		Always
    		Below 1 Ω
    Z1-2 - ZJ2-2
    		Always
    		10 kΩ or higher
    Z1-2 - Body ground
    		Always
    		10 kΩ or higher
    Z1-1 - ZJ2-1
    		Always
    		10 kΩ or higher
    Z1-1 - Body ground
    		Always
    		10 kΩ or higher
    LH
    Tester Connection
    		Condition
    		Specified Condition
    a1-2 - aJ1-1
    		Always
    		Below 1 Ω
    a1-1 - aJ1-2
    		Always
    		Below 1 Ω
    a1-2 - aJ1-2
    		Always
    		10 kΩ or higher
    a1-2 - Body ground
    		Always
    		10 kΩ or higher
    a1-1 - aJ1-1
    		Always
    		10 kΩ or higher
    a1-1 - Body ground
    		Always
    		10 kΩ or higher
    Text in Illustration
    *1
    		Skid Control Sensor Wire
    *a
    		RH
    *b
    		LH

  1. Reconnect the rear speed sensor wire.



NG
REPLACE SKID CONTROL SENSOR WIRE
OK


5.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - 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 A15 brake actuator assembly (skid control ECU) connector and the Z1 and/or a1 rear speed sensor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A15-17 (RR+) - Z1-2
    		Always
    		Below 1 Ω
    A15-16 (RR-) - Z1-1
    		Always
    		Below 1 Ω
    A15-5 (RL+) - a1-2
    		Always
    		Below 1 Ω
    A15-4 (RL-) - a1-1
    		Always
    		Below 1 Ω
    A15-17 (RR+) - Body ground
    		Always
    		10 kΩ or higher
    A15-16 (RR-) - Body ground
    		Always
    		10 kΩ or higher
    A15-5 (RL+) - Body ground
    		Always
    		10 kΩ or higher
    A15-4 (RL-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the A15 brake actuator assembly (skid control ECU) connector and the rear speed sensor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)


    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1407 Open Or Short In Rear Speed Sensor Rh Circuit

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    RH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    Z1-2 - Body ground
    		Ignition switch ON
    		8 to 14 V
    LH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    a1-2 - Body ground
    		Ignition switch ON
    		8 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Rear Speed Sensor)
    *b
    		RH
    *c
    		LH
    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 RM000000XHN0AWX.html).

  1. Reconnect the Z1 and/or a1 rear speed sensor connector.



NG
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)
OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (YARIS_NCP93 RM000001IWU016X.html)