VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1271,C1272,C1330,C1331,C1464 and C1465

DTC Code DTC Name
C1271 Low Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1272 Low Output Signal of Front Speed Sensor LH (Test Mode DTC)
C1330 Open in Front Speed Sensor RH
C1331 Open in Front Speed Sensor LH
C1464 Front Speed Sensor RH
C1465 Front Speed Sensor LH

DESCRIPTION

Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS.

The speed sensor rotors have rows of alternating N and S magnetic poles. The speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.

DTCs C1271 and C1272 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1271 and C1272 are output only in Test Mode.

C223506E08

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

C1271

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

Detected only during Test Mode.

  • Front speed sensor RH

  • Sensor installation

  • Front speed sensor rotor RH (front axle hub bearing RH)

Tire pressure warning light (w/ tire pressure warning system) is off.

C1272

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

Detected only during Test Mode.

  • Front speed sensor LH

  • Sensor installation

  • Front speed sensor rotor LH (front axle hub bearing LH)

Tire pressure warning light (w/ tire pressure warning system) is off.

C1330

Open in Front Speed Sensor RH

An open or short in the speed sensor signal circuit.

  • Front speed sensor RH

  • Speed sensor circuit

  • Sensor installation

Tire pressure warning light (w/ tire pressure warning system) blinks for 63 seconds and then remains on.

C1331

Open in Front Speed Sensor LH

An open or short in the speed sensor signal circuit.

  • Front speed sensor LH

  • Speed sensor circuit

  • Sensor installation

Tire pressure warning light (w/ tire pressure warning system) blinks for 63 seconds and then remains on.

C1464

Front Speed Sensor RH

Any of the following is detected:

  1. The vehicle speed is more than 50.4 km/h (31 mph) and pulses are not input for 0.4 seconds.

  2. After the initial start or restart and when the vehicle speed has reached 12 km/h (7 mph), a wheel speed of 0 km/h (0 mph) is detected.

  3. After the initial start or restart and when the vehicle speed has reached 20 km/h (12 mph), a front wheel speed of 0 km/h (0 mph) is detected.

  4. The following conditions are met for 9 to 72 seconds or more (varies depending on the driving conditions):

    • The difference between the speed of the fastest wheel and the speed of the slowest wheel is 5% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

    • The vehicle speed is less than 100 km/h (62 mph) and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 5 km/h (3 mph) or more. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.)

    • The vehicle speed is 100 km/h (62 mph) or more and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 6% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

  6. Wheel speed sensor signal fluctuation is equivalent to 98 G or more, or alternates between 50 G or more and -50 G or less.

  7. An abnormal signal is received from a wheel speed sensor.

  • Front speed sensor RH

  • Speed sensor circuit

  • Front speed sensor rotor RH (front axle hub bearing RH)

  • Sensor installation

  • Skid control ECU (brake actuator assembly)

Tire pressure warning light (w/ tire pressure warning system) blinks for 63 seconds and then remains on.

C1465

Front Speed Sensor LH

Any of the following is detected:

  1. The vehicle speed is more than 50.4 km/h (31 mph) and pulses are not input for 0.4 seconds.

  2. After the initial start or restart and when the vehicle speed has reached 12 km/h (7 mph), a wheel speed of 0 km/h (0 mph) is detected.

  3. After the initial start or restart and when the vehicle speed has reached 20 km/h (12 mph), a front wheel speed of 0 km/h (0 mph) is detected.

  4. The following conditions are met for 9 to 72 seconds or more (varies depending on the driving conditions):

    • The difference between the speed of the fastest wheel and the speed of the slowest wheel is 5% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

    • The vehicle speed is less than 100 km/h (62 mph) and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 5 km/h (3 mph) or more. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.)

    • The vehicle speed is 100 km/h (62 mph) or more and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 6% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

  6. Wheel speed sensor signal fluctuation is equivalent to 98 G or more, or alternates between 50 G or more and -50 G or less.

  7. An abnormal signal is received from a wheel speed sensor.

  • Front speed sensor LH

  • Speed sensor circuit

  • Front speed sensor rotor LH (front axle hub bearing LH)

  • Sensor installation

  • Skid control ECU (brake actuator assembly)

Tire pressure warning light (w/ tire pressure warning system) blinks for 63 seconds and then remains on.
Tip:

  • DTCs C1271, C1330 and C1464 are for the front speed sensor RH.

  • DTCs C1272, C1331 and C1465 are for the front speed sensor LH.

WIRING DIAGRAM

C243493E34

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

Click hereClick here

PROCEDURE

  1. READ VALUE USING GTS (FRONT SPEED SENSOR)

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Data List using the GTS.

      Click hereClick hereClick here

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      FR Wheel Speed

      Front wheel speed sensor RH reading

      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 wheel speed sensor LH reading

      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

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      FR Wheel Speed

      FL Wheel Speed

    4. Check the speed value output from the speed sensor displayed on the GTS.

      Tip:

      Factors that affect the indicated vehicle speed include tire size, tire pressure, 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 hereClick hereClick here

      OK

      The speed value output from the speed sensor displayed on the GTS is similar to the speed indicated on the speedometer.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK FRONT SPEED SENSOR INSTALLATIONClick here

    OK

  2. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

    1. Turn the ignition switch off.

    2. Perform the sensor check using the Test Mode procedure.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Utility

      Tester Display

      Signal Check

      OK

      No Test Mode DTCs are output.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK FRONT SPEED SENSOR INSTALLATIONClick here

    OK

  3. RECONFIRM DTC

    1. Turn the ignition switch off.

    2. Clear the DTCs.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    6. Check if the same DTC is output.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Result

    Proceed to

    DTCs C1330, C1331, C1464 and C1465 are not output.

    A

    DTCs C1330, C1331, C1464 and/or C1465 are output.

    B
    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    B

    REPLACE FRONT SPEED SENSORClick here

  4. CHECK FRONT SPEED SENSOR INSTALLATION

    1. C168336C10

      *1

      Front Speed Sensor

      *a

      Correct

      *b

      Incorrect

      *c

      8.0 N*m

      *d

      No clearance

      Turn the ignition switch off.

    2. 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

      8.0 N*m (82 kgf*cm, 71 in.*lbf)

    Result

    Proceed to

    OK

    NG
    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY

    Click hereClick here

    OK

  5. CHECK FRONT SPEED SENSOR AND SENSOR ROTOR

    1. Remove the front speed sensor and the component with the sensor rotor.

      for speed sensor:Click here

      for sensor rotor:Click hereClick here

    2. Check the speed sensor tip and speed sensor rotor.

      OK

      No scratches, oil, or foreign matter on the sensor tip and rotor.

      Note:

      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

        If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.

      • Check the speed sensor signal after cleaning or replacement.

        Click hereClick here

    Result

    Proceed to

    OK

    NG
    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)

    1. Install the front speed sensor and the component with the sensor rotor.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the A39 skid control ECU (brake actuator assembly) connector and A3 or A57 front speed sensor connector.

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

      Standard Resistance

      Table 1. for RH:

      Tester Connection

      Condition

      Specified Condition

      A39-16 (FR+) - A3-1 (FR+)

      Always

      Below 1 Ω

      A39-16 (FR+) or A3-1 (FR+) - Body ground

      Always

      10 kΩ or higher

      A39-4 (FR-) - A3-2 (FR-)

      Always

      Below 1 Ω

      A39-4 (FR-) or A3-2 (FR-) - Body ground

      Always

      10 kΩ or higher
      Table 2. for LH:

      Tester Connection

      Condition

      Specified Condition

      A39-19 (FL+) - A57-1 (FL+)

      Always

      Below 1 Ω

      A39-19 (FL+) or A57-1 (FL+) - Body ground

      Always

      10 kΩ or higher

      A39-8 (FL-) - A57-2 (FL-)

      Always

      Below 1 Ω

      A39-8 (FL-) or A57-2 (FL-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. RECONFIRM DTC

    1. Reconnect the A39 skid control ECU (brake actuator assembly) connector and A3 or A57 front speed sensor connector.

    2. Clear the DTCs.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    6. Check if the same DTC is output.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Result

    Proceed to

    DTCs C1330, C1331, C1464 and/or C1465 are output.

    A

    DTCs C1330, C1331, C1464 and C1465 are not output.

    B
    B

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    A

  8. REPLACE FRONT SPEED SENSOR

    1. Turn the ignition switch off.

    2. Replace the front speed sensor.

      Click here

      Note:

      Check the speed sensor signal after replacement.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  9. RECONFIRM DTC

    1. Clear the DTCs.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    5. Check if the same DTC is output.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTCs C1330, C1331, C1464 and/or C1465 are output.

      A

      DTCs C1330, C1331, C1464 and C1465 are not output.

      B
    B

    END

    A

  10. REPLACE FRONT AXLE HUB BEARING

    1. Turn the ignition switch off.

    2. Replace the front speed sensor rotor (front axle hub bearing).

      Click hereClick here

      Tip:

      The front speed sensor rotor is incorporated into the front axle hub bearing.

      If the front speed sensor rotor needs to be replaced, replace the front axle hub bearing.

      Note:

      Check the speed sensor signal after replacement.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  11. RECONFIRM DTC

    1. Clear the DTCs.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    5. Check if the same DTC is output.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTCs C1330, C1331, C1464 and C1465 are not output.

      A

      DTCs C1330, C1331, C1464 and/or C1465 are output.

      B
      Tip:

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

      Click hereClick here

    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click hereClick here