ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1466, C1467

DTC Code DTC Name
C1466 Rear Speed Sensor RH Circuit
C1467 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.

B004WC2E06
DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1466 Rear Speed Sensor RH Circuit

277

278

279

280

281

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.


  • 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 0.5 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: 288


    • Either of the following is detected:


      1. When IG1 voltage is 9.5 V or more, sensor supply voltage drops for 0.5 seconds or more.

      2. When IG1 voltage is 9.5 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: 288


    • Open or short in wire harness

    • Skid control ECU assembly

 -
C1467 Rear Speed Sensor LH Circuit

290

291

292

293

294

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.


  • 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.


  • INF Code: 292


    • An open is detected in the speed sensor signal circuit for 0.5 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: 301


    • Either of the following is detected:


      1. When IG1 voltage is 9.5 V or more, sensor supply voltage drops for 0.5 seconds or more.

      2. When IG1 voltage is 9.5 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: 301


    • Open or short in wire harness

    • Skid control ECU assembly

 -

Tech Tips


  • DTC C1466 is for the rear speed sensor RH.

  • DTC C1467 is for the rear speed sensor LH.

DTC Detection Conditions: C1466 INF Code: 288
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ○ ○
Malfunction Status The sensor power supply voltage is low ○ -
The sensor power supply voltage is unstable - ○
Detection Time 60 seconds or more 60 seconds or more
Number of Trips 1 trip 1 trip
DTC Detection Conditions: C1467 INF Code: 301
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ○ ○
Malfunction Status The sensor power supply voltage is low ○ -
The sensor power supply voltage is unstable - ○
Detection Time 60 seconds or more 60 seconds or more
Number of Trips 1 trip 1 trip

WIRING DIAGRAM

B004XE2E03

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.

      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. Using the GTS, perform a Test Mode (signal check) inspection sensor check and check that all Test Mode (signal check) inspection items change from incomplete to complete.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Signal Check
      OK
      All Test Mode (signal check) inspection items change from incomplete to complete.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 5 Click here

    OK

  4. 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 and C1467 are not output. A
      DTCs C1466 and/or C1467 are output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO STEP 9 Click here

  5. CHECK REAR SPEED SENSOR INSTALLATION


    1. B004TSEC12
      *1 Rear Speed Sensor
      *a OK
      *b NG

      Turn the power switch off.

    2. Check the speed sensor installation.

      OK
      There is no clearance between the sensor and rear axle carrier.
      The installation bolt is tightened properly.
      Torque:
      8.5 N*m  { 87 kgf*cm, 75 in.*lbf }
      Result
      Proceed to
      A
      B

    B

    INSTALL REAR SPEED SENSOR CORRECTLY Click here

    A

  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 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.

      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed 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. INSPECT SKID CONTROL SENSOR WIRE


    1. B004UP4C14
      *A for RH
      *B for LH
      *1 Front view of skid control sensor wire
      *a

      Front view of wire harness connector

      (to Vehicle Side Connector)
      *b

      Front view of wire harness connector

      (to Sensor Side Connector)

      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. Remove the skid control sensor wire.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      z24 -2 (RR+) - L175 -3 (RR+) Always Below 1 Ω
      z24 -2 (RR+) - L175 -4 (RR-) Always 10 MΩ or higher
      z24 -2 (RR+) or L175 -3 (RR+) - Body ground Always 10 MΩ or higher
      z24 -1 (RR-) - L175 -4 (RR-) Always Below 1 Ω
      z24 -1 (RR-) - L175 -3 (RR+) Always 10 MΩ or higher
      z24 -1 (RR-) or L175 -4 (RR-) - Body ground Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      L176 -2 (RL+) - LL4 -3 Always Below 1 Ω
      L176 -2 (RL+) - LL4 -4 Always 10 MΩ or higher
      L176 -2 (RL+) or LL4 -3 - Body ground Always 10 MΩ or higher
      L176 -1 (RL-) - LL4 -4 Always Below 1 Ω
      L176 -1 (RL-) - LL4 -3 Always 10 MΩ or higher
      L176 -1 (RL-) or LL4 -4 - Body ground Always 10 MΩ or higher

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - SKID CONTROL SENSOR WIRE)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the A11 and A13 skid control ECU assembly connectors.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A13-22 (RR+) - L175-3 (RR+) Always Below 1 Ω
      A13-22 (RR+) or L175-3 (RR+) - Body ground Always 10 MΩ or higher
      A13-21 (RR-) - L175-4 (RR-) Always Below 1 Ω
      A13-21 (RR-) or L175-4 (RR-) - Body ground Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A11-34 (RL+) - LL4 -3 Always Below 1 Ω
      A11-34 (RL+) or LL4 -3 - Body ground Always 10 MΩ or higher
      A11-35 (RL-) - LL4 -4 Always Below 1 Ω
      A11-35 (RL-) or LL4 -4 - Body ground Always 10 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK SPEED SENSOR AND SENSOR ROTOR SERRATIONS


    1. B004VZ9C30
      *a

      Component with harness connected

      (Skid Control ECU Assembly)
      *b Normal Signal Waveform

      Reconnect the A11 and A13 skid control ECU assembly connectors.

    2. Install the rear skid control sensor wire.

    3. Connect an oscilloscope to the rear speed sensor terminal of the skid control ECU assembly and body ground.

    4. Check the waveform output when the wheels are rotated.

      OK
      The same waveform is output from all the sensors and there is no noise or interference in the waveform.

      Note

      Check the speed sensor signal after cleaning or replacement.

      Click here

      Tech Tips


      • As the vehicle speed (wheel revolution speed) increases, the waveform cycle narrows.

      • When noise is identified in the waveform on the oscilloscope, the erratic signals are likely due to speed sensor rotor scratches, looseness or attached foreign matter.

      • 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.

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

  10. 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 and/or C1467 are output. A
      DTCs C1466 and C1467 are not output. B

    A

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

    B

    USE SIMULATION METHOD TO CHECK Click here