Dtc C1407 Open Or Short In Rear Speed Sensor Rh Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

READ VALUE USING INTELLIGENT TESTER (RR/RL WHEEL SPEED)

RECONFIRM DTC

INSPECT SKID CONTROL SENSOR WIRE

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

CHECK TERMINAL VOLTAGE (RR+, RL+)

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 C1401 and C1402 (LandCruiser RM000000XI910IX_01.html).

DTC Code
DTC Detection Condition
Trouble Area
C1407
C1408
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. Rear speed sensor RH/LH
  2. Rear skid control sensor wire
  3. Speed sensor circuit
  4. Master cylinder solenoid (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


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1407 Open Or Short In Rear Speed Sensor Rh Circuit


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the master cylinder solenoid, perform calibration (LandCruiser RM00000452J00ZX.html).
  2. Check the speed sensor signal after replacement (LandCruiser RM00000452K011X.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 RM000001DX102MX.html).

    ABS/VSC/TRC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    RR Speed Open
    		Rear speed sensor RH open detection/ Error or Normal
    		Normal
    		-
    RL Speed Open
    		Rear speed sensor LH open 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 INTELLIGENT TESTER (RR/RL 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
    RR Wheel Speed
    		Rear 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.
    RL Wheel Speed
    		Rear 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 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, see 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 DTC (LandCruiser RM0000046KV016X.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 RM0000046KV016X.html).

    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 (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

4.INSPECT SKID CONTROL SENSOR WIRE

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1407 Open Or Short In Rear Speed Sensor Rh Circuit


Text in Illustration
*A
for RH
*B
for LH
*1
Skid Control Sensor Wire
-
-

  1. Remove the skid control sensor wire (LandCruiser RM000001B2G023X.html).

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

    Standard Resistance:
    for RH
    Tester Connection
    		Condition
    		Specified Condition
    Sq1-4 - q1-2 (RR+)
    		Always
    		Below 1 Ω
    Sq1-3 - q1-1 (RR-)
    		Always
    		Below 1 Ω
    Sq1-4 - Sq1-3
    		Always
    		10 kΩ or higher
    Sq1-4 - Sq1-1
    		Always
    		10 kΩ or higher
    Sq1-4 - Sq1-2
    		Always
    		10 kΩ or higher
    for LH
    Tester Connection
    		Condition
    		Specified Condition
    Sq1-2 - q2-2 (RL+)
    		Always
    		Below 1 Ω
    Sq1-1 - q2-1 (RL-)
    		Always
    		Below 1 Ω
    Sq1-2 - Sq1-1
    		Always
    		10 kΩ or higher
    Sq1-2 - Sq1-3
    		Always
    		10 kΩ or higher
    Sq1-2 - Sq1-4
    		Always
    		10 kΩ or higher


NG
REPLACE SKID CONTROL SENSOR WIRE (LandCruiser RM000001B2G023X.html)
OK


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

  1. Install the skid control sensor wire.

  1. Disconnect the A7 skid control ECU connector.

  1. Disconnect the q1 and/or q2 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
    A7-5 (RR+) - q1-2 (RR+)
    		Always
    		Below 1 Ω
    A7-5 (RR+) - Body ground
    		Always
    		10 kΩ or higher
    A7-19 (RR-) - q1-1 (RR-)
    		Always
    		Below 1 Ω
    A7-19 (RR-) - Body ground
    		Always
    		10 kΩ or higher
    for LH
    Tester Connection
    		Condition
    		Specified Condition
    A7-20 (RL+) - q2-2 (RL+)
    		Always
    		Below 1 Ω
    A7-20 (RL+) - Body ground
    		Always
    		10 kΩ or higher
    A7-6 (RL-) - q2-1 (RL-)
    		Always
    		Below 1 Ω
    A7-6 (RL-) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK TERMINAL VOLTAGE (RR+, RL+)

  1. Disconnect the q1 and/or q2 speed sensor connector.

  1. Connect the A7 skid control ECU connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1407 Open Or Short In Rear 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
    q1-2 (RR+) - Body ground
    		Ignition switch ON
    		11 to 14 V
    for LH
    Tester Connection
    		Switch Condition
    		Specified Condition
    q2-2 (RL+) - 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 Rear Speed Sensor)
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

REPLACE REAR SPEED SENSOR (LandCruiser RM000001B2G023X.html)