Dtc C1405 Open Or Short In Front Speed Sensor Rh Circuit

Brake. Land Cruiser. Urj200, 202 Grj200 Vdj200
Brake Control Dynamic Control Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

READ VALUE USING GTS (FR/FL WHEEL SPEED)

RECONFIRM DTC

INSPECT SKID CONTROL SENSOR WIRE

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

CHECK HARNESS AND CONNECTOR (FR+/FL+ TERMINAL)

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 (Click here).

DTC Code
DTC Detection Condition
Trouble Area
C1405
C1406
Either condition is met:
  1. An open in the speed sensor signal circuit continues for 0.5 seconds or more.
  2. With the IG1 terminal voltage at 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.
  1. Front speed sensor RH/LH
  2. Skid control sensor wire
  3. Speed sensor circuit
  4. Skid control ECU (Master cylinder solenoid)
HINT:
  1. DTC C1405 is for the front speed sensor RH.
  2. DTC C1406 is for the front speed sensor LH.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1405 Open Or Short In Front Speed Sensor Rh Circuit


INSPECTION PROCEDURE

NOTICE:
  1. After replacing the master cylinder solenoid, perform zero point calibration and store the system information (Click here).
  2. Check the speed sensor signal after replacement (Click here).
1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the GTS, check for any momentary interruption in the wire harness and connector corresponding to the DTC (Click here).

    ABS/VSC/TRC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    FR Speed Open
    		Front speed sensor RH open circuit detection/ Error or Normal
    		Normal
    		-
    FL Speed Open
    		Front speed sensor LH open circuit detection/ Error or Normal
    		Normal
    		-
    OK:
    Normal (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 GTS (FR/FL WHEEL SPEED)

  1. Turn the ignition switch off.

  1. Connect the GTS to the DLC3.

  1. Start the engine.

  1. Turn the GTS on.

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

    ABS/VSC/TRC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    FR Wheel Speed
    		Front speed sensor RH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    		Actual wheel speed
    		No large fluctuations when driving at a constant speed.
    FL Wheel Speed
    		Front speed sensor LH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    		Actual wheel speed
    		No large fluctuations when driving at a constant speed.

  1. Check that there is no difference between the speed value output from the speed sensor displayed on the GTS 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, refer to the reference chart (Click here).
    OK:
    The speed value output from the speed sensor displayed on the GTS is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).


NG
Go to step 4
OK


3.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Turn the ignition switch off.

  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 output (Click here).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output (for LHD)
    		B
    DTC is output (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)

4.INSPECT SKID CONTROL SENSOR WIRE

  1. Remove the skid control sensor wire (Click here).



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1405 Open Or Short In Front Speed Sensor Rh Circuit

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

    Standard Resistance:
    for RH
    Tester Connection
    		Condition
    		Specified Condition
    Az2-1 - z17-1 (FR-)
    		Always
    		Below 1 Ω
    Az2-5 - z17-2 (FR+)
    		Always
    		Below 1 Ω
    z17-1 (FR-) - z17-2 (FR+)
    		Always
    		10 kΩ or higher
    for LH
    Tester Connection
    		Condition
    		Specified Condition
    Az1-1 - z18-1 (FL-)
    		Always
    		Below 1 Ω
    Az1-5 - z18-2 (FL+)
    		Always
    		Below 1 Ω
    z18-1 (FL-) - z18-2 (FL+)
    		Always
    		10 kΩ or higher
    Text in Illustration
    *A
    		for RH
    *B
    		for LH
    *1
    		Skid Control Sensor Wire


NG
REPLACE SKID CONTROL SENSOR WIRE (Click here)
OK


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

  1. Install the skid control sensor wire (Click here).

  1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

  1. Disconnect the z17 and/or z18 speed sensor connector.

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

    Standard Resistance:

    for RH
    Tester Connection
    		Condition
    		Specified Condition
    A24-3 (FR+) - z17-2 (FR+)
    		Always
    		Below 1 Ω
    A24-3 (FR+) - Body ground
    		Always
    		10 kΩ or higher
    A24-17 (FR-) - z17-1 (FR-)
    		Always
    		Below 1 Ω
    A24-17 (FR-) - Body ground
    		Always
    		10 kΩ or higher

    for LH
    Tester Connection
    		Condition
    		Specified Condition
    A24-18 (FL+) - z18-2 (FL+)
    		Always
    		Below 1 Ω
    A24-18 (FL+) - Body ground
    		Always
    		10 kΩ or higher
    A24-4 (FL-) - z18-1 (FL-)
    		Always
    		Below 1 Ω
    A24-4 (FL-) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR (FR+/FL+ TERMINAL)

  1. Disconnect the speed sensor connector.

  1. Connect the A24 skid control ECU (master cylinder solenoid) connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1405 Open Or Short In Front Speed Sensor Rh Circuit

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

    Standard Voltage:
    for RH
    Tester Connection
    		Switch Condition
    		Specified Condition
    z17-2 (FR+) - Body ground
    		Ignition switch ON
    		11 to 14 V
    for LH
    Tester Connection
    		Switch Condition
    		Specified Condition
    z18-2 (FL+) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *A
    		for RH
    *B
    		for LH
    *a
    		Front view of wire harness connector
    (to Front Speed Sensor)
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

REPLACE FRONT SPEED SENSOR (Click here)