DTC    C1271/71    Low Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC    C1272/72    Low Output Signal of Front Speed Sensor LH (Test Mode DTC)

DTC    C1464/31    Front Speed Sensor RH Circuit

DTC    C1465/32    Front Speed Sensor LH Circuit

for Preparation Click here


DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.
DTCs C1271/71 and C1272/72 can be cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1271/71 and C1272/72 are output only in Test Mode.

F100269E05


DTC Code
INF Code
DTC Detection Condition
Trouble Area
C1464/31
501
While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Front speed sensor RH
  6. Brake booster with master cylinder (Skid control ECU)
↑
502
A malfunction occurs in 2 or more wheels.
↑
↑
503
An open is detected in the speed sensor signal circuit for 0.05 seconds or more.
  1. Open or short in speed sensor
  2. Open or short in wire harness
  3. Improperly connected connector, deformation or corrosion of terminals
  4. Front speed sensor RH
  5. Brake booster with master cylinder (Skid control ECU)
↑
504
Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Front speed sensor RH
  6. Brake booster with master cylinder (Skid control ECU)
↑
506
When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.
  1. Open or short in wire harness
  2. Brake booster with master cylinder (Skid control ECU)
↑
507
While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Front speed sensor RH
  6. Brake booster with master cylinder (Skid control ECU)
↑
508
When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.
  1. Open or short in wire harness
  2. Brake booster with master cylinder (Skid control ECU)
C1465/32
511
While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Front speed sensor LH
  6. Brake booster with master cylinder (Skid control ECU)
↑
512
A malfunction occurs in 2 or more wheels.
↑
↑
513
An open is detected in the speed sensor signal circuit for 0.05 seconds or more.
  1. Open or short in speed sensor
  2. Open or short in wire harness
  3. Improperly connected connector, deformation or corrosion of terminals
  4. Front speed sensor LH
  5. Brake booster with master cylinder (Skid control ECU)
↑
514
Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Front speed sensor LH
  6. Brake booster with master cylinder (Skid control ECU)
↑
516
When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.
  1. Open or short in wire harness
  2. Brake booster with master cylinder (Skid control ECU)
↑
517
While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Front speed sensor LH
  6. Brake booster with master cylinder (Skid control ECU)
↑
518
When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.
  1. Open or short in wire harness
  2. Brake booster with master cylinder (Skid control ECU)
C1271/71
C1272/72
-
Detected only during Test Mode.
  1. Front speed sensor RH/LH
  2. Sensor installation
  3. Speed sensor rotor

HINT:
  1. DTCs C1464/31 and C1271/71 are for the front speed sensor RH.
  2. DTCs C1465/32 and C1272/72 are for the front speed sensor LH.


WIRING DIAGRAM


C209842E04


INSPECTION PROCEDURE

NOTICE:
When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve (Click here).

1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the intelligent tester, check for any momentary interruptions in the wire harness and connector corresponding to a DTC (Click here).

    ABS/VSC/TRC 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    FR Speed Open
    		Front speed sensor RH open detection / Error or Normal
    		Error: Momentary interruption
    Normal: Normal
    		-
    FL Speed Open
    		Front speed sensor LH 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
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.READ VALUE USING INTELLIGENT TESTER (FRONT SPEED SENSOR)

  1. Select the Data List on the intelligent tester (Click here).

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

  1. Check that the speed value output from the speed sensor displayed on the intelligent tester.

    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 (Click here).

    OK:
    The speed value output from the speed sensor displayed on the intelligent tester is the similar speed as indicated on the speedometer.



NG
Go to step 5
OK


3.PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

  1. Turn the power switch off.

  1. Perform the sensor check in the Test Mode procedure (Click here).

    OK:
    All Test Mode DTCs are cleared.



NG
Go to step 5
OK


4.RECONFIRM DTC

  1. Turn the power switch off.

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1464/31 and C1465/32) are not output
    		A
    DTCs (C1464/31 and/or C1465/32) are output
    		B

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).



B
Go to step 10
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)  

5.CHECK FRONT SPEED SENSOR INSTALLATION


    C144929E26

  1. Turn the power switch off.

  1. Check the speed sensor installation.

    OK:
    There is no clearance between the sensor and the front steering knuckle.
    The installation bolt is tightened properly.
    Torque:
    8.5 N*m (87 kgf*cm, 75 in.*lbf)



NG
INSTALL FRONT SPEED SENSOR CORRECTLY (Click here)
OK


6.CHECK FRONT SPEED SENSOR TIP

  1. Remove the front speed sensor (Click here).

  1. Check the speed sensor tip.

    OK:
    The sensor tip is free of scratches, oil, and foreign matter.

    NOTICE:
    Check the speed sensor signal after cleaning or replacement (Click here).



NG
CLEAN OR REPLACE FRONT SPEED SENSOR
OK


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

  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:
    for RH:
    Tester Connection
    		Condition
    		Specified Condition
    A61-18 (FR+) - A34-2 (FR+)
    		Always
    		Below 1 Ω
    A61-18 (FR+) - Body ground
    		Always
    		10 kΩ or higher
    A61-5 (FR-) - A34-1 (FR-)
    		Always
    		Below 1 Ω
    A61-5 (FR-) - Body ground
    		Always
    		10 kΩ or higher
    for LH:
    Tester Connection
    		Condition
    		Specified Condition
    A61-31 (FL+) - A13-2 (FL+)
    		Always
    		Below 1 Ω
    A61-31 (FL+) - Body ground
    		Always
    		10 kΩ or higher
    A61-32 (FL-) - A13-1 (FL-)
    		Always
    		Below 1 Ω
    A61-32 (FL-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    C156480E51

  1. Reconnect the skid control ECU connector.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    for RH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A34-2 (FR+) - Body ground
    		Power switch on (IG)
    		5.7 to 14 V
    for LH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A13-2 (FL+) - Body ground
    		Power switch on (IG)
    		5.7 to 14 V

    Text in Illustration 
    *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 BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)
A


9.RECONFIRM DTC

  1. Turn the power switch off.

  1. Reconnect the front speed sensor connector.

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1464/31 and/or C1465/32) are output
    		A
    DTCs (C1464/31 and C1465/32) are not output
    		B

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).



B
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A


10.REPLACE FRONT SPEED SENSOR

  1. Turn the power switch off.

  1. Replace the front speed sensor (Click here).

    NOTICE:
    Check the speed sensor signal after replacement (Click here).


NEXT


11.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1464/31 and/or C1465/32) are output
    		A
    DTCs (C1464/31 and C1465/32) are not output
    		B

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).



B
END
A


12.REPLACE FRONT SPEED SENSOR ROTOR

  1. Turn the power switch off.

  1. Replace the front axle hub sub-assembly (front speed sensor rotor) (Click here).

    HINT:
    The front speed sensor rotor is incorporated into the front axle hub sub-assembly.
    If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.

    NOTICE:
    Check the speed sensor signal after replacement (Click here).


NEXT


13.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1464/31 and/or C1465/32) are output (for LHD)
    		A
    DTCs (C1464/31 and/or C1465/32) are output (for RHD)
    		B
    DTCs (C1464/31 and C1465/32) are not output
    		C

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
END
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)