Dtc C1405 Open Or Short In Front Speed Sensor Rh Circuit

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 (FRONT SPEED SENSOR)

RECONFIRM DTC

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

INSPECT SKID CONTROL ECU (SENSOR INPUT)

DTC C1405 Open or Short in Front Speed Sensor RH Circuit

DTC C1406 Open or Short in Front Speed Sensor LH Circuit


DESCRIPTION

Refer to DTCs C1401 and C1402 (YARIS_NCP93 RM000000XI90L3X.html).

DTC No.
DTC Detection Condition
Trouble Area
C1405
C1406
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. Front speed sensor RH/LH
  2. Speed sensor circuit
  3. Skid control ECU (Brake actuator assembly)
HINT:
  1. DTC C1405 is for the front speed sensor RH.
  2. DTC C1406 is for the front speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1401 and C1402 (YARIS_NCP93 RM000000XI90L3X_02.html).

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR07EX.html).
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 RM000000XHS0AZX.html).

    ABS/VSC/TRAC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    FR Speed Open
    		FR speed sensor open detection / Normal or Error
    		Normal: Normal
    Error: Momentary interruption
    		-
    FL Speed Open
    		FL speed sensor open detection / 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 4
OK


2.READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

  1. Connect the Techstream to the DLC3.

  1. Start the engine.

  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
    FR Wheel Speed
    		FR 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
    FL Wheel Speed
    		FL 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).
    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 RM000000XHN0C2X.html).
Result
Result
Proceed to
NG
A
OK
B


NG
Go to step 4
OK


3.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0D3X.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 RM000000XHV0D3X.html).

Result
Result
Proceed to
DTCs C1405 and C1406 are not output
A
DTCs C1405 and/or C1406 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 RM000000XHN0C2X.html).


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

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS0AZX.html)

4.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT 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 front speed sensor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A70-7 (FR+) - A54-2 (FR+)
    		Always
    		Below 1 Ω
    A70-6 (FR-) - A54-1 (FR-)
    		Always
    		Below 1 Ω
    A70-19 (FL+) - A55-2 (FL+)
    		Always
    		Below 1 Ω
    A70-18 (FL-) - A55-1 (FL-)
    		Always
    		Below 1 Ω
    A70-7 (FR+) - Body ground
    		Always
    		10 kΩ or higher
    A70-6 (FR-) - Body ground
    		Always
    		10 kΩ or higher
    A70-19 (FL+) - Body ground
    		Always
    		10 kΩ or higher
    A70-18 (FL-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the skid control ECU connector and the front speed sensor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT SKID CONTROL ECU (SENSOR INPUT)


    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1405 Open Or Short In Front 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:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A54-2 (FR+) - Body ground
    		Ignition switch to ON
    		8 to 14 V
    A55-2 (FL+) - Body ground
    		Ignition switch to ON
    		8 to 14 V
    NOTICE:
    Check the speed sensor signal after replacement (YARIS_NCP93 RM000000XHT09FX.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 RM000000XHN0C2X.html).
Text in Illustration
*a
Front view of wire harness connector
(to Front Speed Sensor)


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

REPLACE FRONT SPEED SENSOR (YARIS_NCP93 RM000001BXX01FX.html)