Dtc C1405 Open Or Short In Front Speed Sensor Rh Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

READ VALUE USING INTELLIGENT TESTER (FR/FL WHEEL SPEED)

RECONFIRM DTC

INSPECT SKID CONTROL SENSOR WIRE

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

CHECK TERMINAL VOLTAGE (FR+, FL+)

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 (LandCruiser RM000000XI910KX_01.html).

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. Brake actuator assembly (Skid control ECU)
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, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1405 Open Or Short In Front Speed Sensor Rh Circuit


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform calibration (LandCruiser RM000000XHR0BKX.html).
  2. Check the speed sensor signal after replacement (LandCruiser RM000000XHT0EPX.html).
1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to the DTC (LandCruiser RM000000XHS0GIX.html).

    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 disconnecting the connector.


NG
Go to step 4
OK


2.READ VALUE USING INTELLIGENT TESTER (FR/FL WHEEL SPEED)

  1. Turn the ignition switch off

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Turn the intelligent tester 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 value/ 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 value/ 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 intelligent tester 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 (LandCruiser RM000002Z4Q040X.html).
    OK:
    The speed value output from the speed sensor displayed on the intelligent tester 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. Turn the ignition switch off.

  1. Clear the DTCs (LandCruiser RM000000XHV0KEX.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 output (LandCruiser RM000000XHV0KEX.html).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
REPLACE BRAKE ACTUATOR ASSEMBLY (LandCruiser RM0000034UX02TX.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

4.INSPECT SKID CONTROL SENSOR WIRE

  1. Turn the ignition switch off.

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

  1. Remove the skid control sensor wire (LandCruiser RM000001B2J024X.html).



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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
    Ap1-1 - p1-1 (FR-)
    		Always
    		Below 1 Ω
    Ap1-2 - p1-2 (FR+)
    		Always
    		Below 1 Ω
    Ap1-1 - Ap1-2
    		Always
    		10 kΩ or higher
    for LH
    Tester Connection
    		Condition
    		Specified Condition
    Ap2-1 - p2-1 (FL-)
    		Always
    		Below 1 Ω
    Ap2-2 - p2-2 (FL+)
    		Always
    		Below 1 Ω
    Ap2-1 - Ap2-2
    		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 (LandCruiser RM000001B2J024X.html)
OK


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

  1. Install the skid control sensor wire.

  1. Disconnect the A6 skid control ECU connector.

  1. Disconnect the p1 and/or p2 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
    A6-7 (FR+) - p1-2 (FR+)
    		Always
    		Below 1 Ω
    A6-7 (FR+) - Body ground
    		Always
    		10 kΩ or higher
    A6-6 (FR-) - p1-1 (FR-)
    		Always
    		Below 1 Ω
    A6-6 (FR-) - Body ground
    		Always
    		10 kΩ or higher
    for LH:
    Tester Connection
    		Condition
    		Specified Condition
    A6-19 (FL+) - p2-2 (FL+)
    		Always
    		Below 1 Ω
    A6-19 (FL+) - Body ground
    		Always
    		10 kΩ or higher
    A6-18 (FL-) - p2-1 (FL-)
    		Always
    		Below 1 Ω
    A6-18 (FL-) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK TERMINAL VOLTAGE (FR+, FL+)

  1. Connect the A6 skid control ECU connector.

  1. Disconnect the p1 and/or p2 speed sensor connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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
    p1-2 (FR+) - Body ground
    		Ignition switch ON
    		8 to 14 V
    for LH
    Tester Connection
    		Switch Condition
    		Specified Condition
    p2-2 (FL+) - Body ground
    		Ignition switch ON
    		8 to 14 V
    Text in Illustration
    *A
    		for RH
    *B
    		for LH
    *a
    		Front view of wire harness connector
    (to Front Speed Sensor)


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (LandCruiser RM0000034UX02TX.html)
OK

REPLACE FRONT SPEED SENSOR (LandCruiser RM000001B2J024X.html)