ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1273/73, C1274/74, C1466/33, C1467/34

DTC Code DTC Name
C1273/73 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1274/74 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)
C1466/33 Rear Speed Sensor RH Circuit
C1467/34 Rear Speed Sensor LH Circuit

DESCRIPTION

Each speed sensor detects the wheel speed and sends signals to the skid control ECU assembly. These signals are used for ABS control.

DTCs C1273/73 and C1274/74 are cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1273/73 and C1274/74 are output only in Test Mode.

B003YJME02
DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1273/73 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) - Detected only during Test Mode.

  • Open or short in speed sensor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Sensor installation

  • Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)

 ABS Test Mode DTC
C1274/74 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC) - Detected only during Test Mode.

  • Open or short in speed sensor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Sensor installation

  • Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)

 ABS Test Mode DTC
C1466/33 Rear Speed Sensor RH Circuit

277

278

279

280

281

287

288

  • INF Code: 277


    • At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit for 1 second or more.


  • INF Code: 278


    • A malfunction occurs in 2 or more wheels.


  • INF Code: 279


    • An open is detected in the speed sensor signal circuit for 0.05 seconds or more.


  • INF Code: 280


    • Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.


  • INF Code: 281


    • Frequency of 2.4 kHz or more is input.


  • INF Code: 287


    • When VM terminal voltage is 8.5 V or more and the vehicle speed is more than 3 km/h (2 mph), the speed sensor rotates in the opposite direction.


      1. for 1 second during Test Mode

      2. for 5 seconds if Test Mode is not activated


  • INF Code: 288


    • Either of the following is detected:


      1. When VM voltage is 8.5 V or more, sensor supply voltage drops for 0.5 seconds or more.

      2. When VM voltage is 8.5 V or more, sensor supply voltage fluctuates for 60 seconds or more.

  • INF Code: 277, 278, 279, 280


    • Open or short in speed sensor

    • Improperly installed speed sensor, or abnormal clearance between sensor and rotor

    • Open or short in wire harness

    • Improperly connected connector, deformation or corrosion of terminals

    • Resistance in speed sensor circuit

    • Rear speed sensor RH

    • Skid control ECU assembly


  • INF Code: 281


    • Open or short in speed sensor

    • Open or short in wire harness

    • Rear speed sensor RH

    • Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)


  • INF Code: 287


    • Rear speed sensor RH


  • INF Code: 288


    • Open or short in wire harness

    • Skid control ECU assembly

 ABS DTC
C1467/34 Rear Speed Sensor LH Circuit

290

291

292

293

294

300

301

  • INF Code: 290


    • At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit for 1 second or more.


  • INF Code: 291


    • A malfunction occurs in 2 or more wheels.


  • INF Code: 292


    • An open is detected in the speed sensor signal circuit for 0.05 seconds or more.


  • INF Code: 293


    • Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.


  • INF Code: 294


    • Frequency of 2.4 kHz or more is input.


  • INF Code: 300


    • When VM terminal voltage is 8.5 V or more and the vehicle speed is more than 3 km/h (2 mph), the speed sensor rotates in the opposite direction.


      1. for 1 second during Test Mode

      2. for 5 seconds if Test Mode is not activated


  • INF Code: 301


    • Either of the following is detected:


      1. When VM voltage is 8.5 V or more, sensor supply voltage drops for 0.5 seconds or more.

      2. When VM voltage is 8.5 V or more, sensor supply voltage fluctuates for 60 seconds or more.

  • INF Code: 290, 291, 292, 293


    • Open or short in speed sensor

    • Improperly installed speed sensor, or abnormal clearance between sensor and rotor

    • Open or short in wire harness

    • Improperly connected connector, deformation or corrosion of terminals

    • Resistance in speed sensor circuit

    • Rear speed sensor LH

    • Skid control ECU assembly


  • INF Code: 294


    • Open or short in speed sensor

    • Open or short in wire harness

    • Rear speed sensor LH

    • Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)


  • INF Code: 300


    • Rear speed sensor LH


  • INF Code: 301


    • Open or short in wire harness

    • Skid control ECU assembly

 ABS DTC

Tech Tips


  • DTCs C1466/33 and C1273/73 are for the rear speed sensor RH.

  • DTCs C1467/34 and C1274/74 are for the rear speed sensor LH.

WIRING DIAGRAM

B003YLXE03

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU assembly, perform initialization and calibration of the linear solenoid valve.

Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the GTS, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Speed Open Rear speed sensor RH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      RL Speed Open Rear speed sensor LH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      RR Speed Open
      RL Speed Open
      OK
      There are no momentary interruptions.

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK REAR SPEED SENSOR INSTALLATION Click here

    OK

  2. READ VALUE USING GTS (REAR SPEED SENSOR)


    1. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Wheel Speed Rear 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
      RL Wheel Speed Rear 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

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      RR Wheel Speed
      RL Wheel Speed

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

      Tech Tips

      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 GTS is similar to the speed indicated on the speedometer.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 5 Click here

    OK

  3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)


    1. Turn the power switch off.

    2. Perform the sensor check in Test Mode Procedure.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Signal Check
      OK
      All Test Mode DTCs are cleared.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 5 Click here

    OK

  4. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (READY).

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and C1467/34 are not output. A
      DTCs C1466/33 and/or C1467/34 are output. B

      Tech Tips

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

      Click here


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO STEP 10 Click here

  5. CHECK REAR SPEED SENSOR INSTALLATION


    1. B003YRIC04
      *1 Rear Speed Sensor
      *a 8.5 Nm
      *b No clearance
      *c OK
      *d NG

      Turn the power switch off.

    2. Check the speed sensor installation.

      OK
      There is no clearance between the sensor and rear axle carrier.
      Torque:
      8.5 N*m  { 87 kgf*cm, 75 in.*lbf }
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL REAR SPEED SENSOR CORRECTLY Click here

    OK

  6. CHECK REAR SPEED SENSOR AND SENSOR ROTOR


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

      for Speed Sensor: Click here

      for Speed Sensor Rotor: Click here

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

      OK
      The sensor tip and rotor are free of scratches, oil, and foreign matter.

      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 here

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

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


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

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

    3. Disconnect the A24 or A25 skid control ECU assembly connector.

    4. Disconnect the P19 or Q28 rear speed sensor connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A25-11 (RR+) - P19-1 (RR+) Always Below 1 Ω
      A25-11 (RR+) or P19-1 (RR+) - Body ground Always 10 kΩ or higher
      A25-10 (RR-) - P19-2 (RR-) Always Below 1 Ω
      A25-10 (RR-) or P19-2 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A24-11 (RL+) - Q28-1 (RL+) Always Below 1 Ω
      A24-11 (RL+) or Q28-1 (RL+) - Body ground Always 10 kΩ or higher
      A24-10 (RL-) - Q28-2 (RL-) Always Below 1 Ω
      A24-10 (RL-) or Q28-2 (RL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT SKID CONTROL ECU ASSEMBLY (SENSOR POWER SUPPLY OUTPUT)


    1. B003Y9MC15
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Rear Speed Sensor)

      Reconnect the A24 or A25 skid control ECU assembly connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      for RH
      Tester Connection Condition Specified Condition
      P19-1 (RR+) - Body ground Power switch on (IG) 6.7 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      Q28-1 (RL+) - Body ground Power switch on (IG) 6.7 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    OK

  9. RECONFIRM DTC


    1. Turn the power switch off.

    2. Reconnect the P19 or Q28 rear speed sensor connector.

    3. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    4. Turn the power switch off.

    5. Turn the power switch on (READY).

    6. Perform a road test.

    7. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and/or C1467/34 are output. A
      DTCs C1466/33 and C1467/34 are not output. B

      Tech Tips

      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

    USE SIMULATION METHOD TO CHECK Click here

    A

  10. REPLACE REAR SPEED SENSOR


    1. Turn the power switch off.

    2. Replace the rear speed sensor.

      Click here

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (READY).

    4. Perform a road test.

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and/or C1467/34 are output. A
      DTCs C1466/33 and C1467/34 are not output. B

      Tech Tips

      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 REAR AXLE HUB AND BEARING ASSEMBLY


    1. Turn the power switch off.

    2. Replace the rear speed sensor rotor (rear axle hub and bearing assembly).

      Click here

      Tech Tips

      The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

      If the rear speed sensor rotor needs to be replaced, replace the rear axle hub and bearing assembly.

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  13. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (READY).

    4. Perform a road test.

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and/or C1467/34 are output. A
      DTCs C1466/33 and C1467/34 are not output. B

      Tech Tips

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

      Click here


    A

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    B

    END