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ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1273, C1274, C1277, C1278, C1332, C1333, C1466, C1467

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DTC Code DTC Name
C1273 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1274 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)
C1277 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1278 Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)
C1332 Open in Rear Speed Sensor RH
C1333 Open in Rear Speed Sensor LH
C1466 Rear Speed Sensor RH
C1467 Rear Speed Sensor LH
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DESCRIPTION

The speed sensors detect the wheel speeds and send appropriate signals to the skid control ECU (brake actuator assembly).

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change as the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU (brake actuator assembly).

Tip:

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.

Table 1. Text in Illustration
*1 Speed Sensor *2 Speed Sensor Rotor
*a

Waveform (Reference):

Between Speed Sensor (-) and Body Ground

 *b Low speed
*c High speed - -
DTC No. DTC Detection Condition Trouble Area

C1332

C1333

 Open in skid control sensor circuit continues for 0.15 seconds or more.

  • Rear speed sensor RH/LH

  • Rear speed sensor circuit

  • Sensor installation

C1466

C1467

When any of following conditions detected:


  1. When vehicle speed 15 km/h (9 mph), wheel speed 2 km/h (1 mph).

  2. At vehicle speed of 45 km/h (28 mph) or more, open in sensor harness occurs intermittently for 0.2 seconds or more.

  3. When vehicle speed between 10 km/h (6 mph) and 15 km/h (9 mph) for 3 minutes, one wheel speed 2 km/h (1 mph) or less.

  4. Pressure reduction mode of ABS system lasts for 28 seconds or more.

  5. When vehicle driven at speed of 20 km/h (12 mph) or more, difference between wheel speeds indicated by two sensors twice or more for 30 seconds or more.

  6. Foreign matter adheres to sensor rotor.

  • Rear speed sensor circuit

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

  • Sensor installation

  • Skid control ECU (brake actuator assembly)
Table 2. Test Mode Diagnosis Code
DTC No. DTC Detection Condition Trouble Area

C1273

C1274

 Detected only during test mode.

  • Sensor installation

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

C1277

C1278

 Detected only during test mode.

  • Rear speed sensor (open)

  • Rear speed sensor circuit (open)
Tip:

  • DTC C1332 and C1466 relate to the skid control sensor RH.

  • DTC C1333 and C1467 relate to the skid control sensor LH.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Disassembly of the skid control sensor from the rear axle hub and bearing assembly is prohibited.

  • Check the speed sensor signal in test mode after cleaning or replacement (Click here).

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PROCEDURE


  1. Click here

    READ VALUE USING GTS (RR WHEEL SPEED AND RL WHEEL SPEED)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Entry the following menu: Chassis / ABS/VSC/TRC / Data List.

    5. In accordance with the display on the GTS, read the Data List.

      Table 3. ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Wheel Speed Wheel speed sensor (RR) reading: min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Similar to speed indicated on speedometer When driving at constant speed: No large fluctuations
      RL Wheel Speed Wheel speed sensor (RL) reading: min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Similar to speed indicated on speedometer When driving at constant speed: No large fluctuations

    6. Check that there is no significant difference between the speed value displayed on the GTS and the speed value displayed on the speedometer when driving the vehicle.

      OK
      There is almost no difference in the displayed speed values.
      Tip:

      There is a tolerance of +/- 10% in the speedometer indication.


  2. Click here

    PERFORM TEST MODE INSPECTION (SIGNAL CHECK)


    1. Perform a Test Mode inspection and check for DTCs (Click here).

      OK
      No DTCs output.

  3. Click here

    RECONFIRM DTC


    1. Clear the DTC(s) (Click here).

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    4. Check if the same DTC(s) is output (Click here).

      Table 4. Result
      Result Proceed to
      DTC not output A
      DTCs C1332, C1333, C1466 and C1467 are not output B

  4. Click here

    CHECK REAR SPEED SENSOR INSTALLATION


    1. B0048CFC02
      *a Normal
      *b Abnormal
      *c Clearance

      Visually check the speed sensor for deformation and damage.

      OK
      No deformation or damage.
      There is no gap between the sensor and rear axle carrier.

  5. Click here

    INSPECT SKID CONTROL SENSOR WIRE


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

    2. Remove the skid control sensor wire LH and skid control sensor wire RH.

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

      Standard Resistance (for LH)
      Tester Connection Condition Specified Condition
      V1-2 (+) - VK1-1 Always Below 1 Ω
      V1-1 (-) - VK1-2 Always Below 1 Ω
      V1-2 (+) - VK1-2 Always 10 kΩ or higher
      V1-2 (+) - Body ground Always 10 kΩ or higher
      V1-1 (-) - VK1-1 Always 10 kΩ or higher
      V1-1 (-) - Body ground Always 10 kΩ or higher
      Standard Resistance (for RH)
      Tester Connection Condition Specified Condition
      W1-2 (+) - WK1-1 Always Below 1 Ω
      W1-1 (-) - WK1-2 Always Below 1 Ω
      W1-2 (+) - WK1-2 Always 10 kΩ or higher
      W1-2 (+) - Body ground Always 10 kΩ or higher
      W1-1 (-) - WK1-1 Always 10 kΩ or higher
      W1-1 (-) - Body ground Always 10 kΩ or higher

  6. Click here

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - SKID CONTROL SENSOR WIRE)


    1. Confirm that the skid control ECU (brake actuator assembly) connector and skid control sensor wire connector are properly connected.

    2. Disconnect the A78*1 or A79*2 skid control ECU (brake actuator assembly) connector.


      • *1: for RHD

      • *2: for LHD

    3. Disconnect the VK1 skid control sensor wire LH connector.

    4. Disconnect the WK1 skid control sensor wire RH connector.

    5. Inspect both the connector case and the terminal for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Resistance (for RHD)
      Tester Connection Condition Specified Condition
      A78-3 (RL+) - VK1-1 (RL+) Always Below 1 Ω
      A78-2 (RL-) - VK1-2 (RL-) Always Below 1 Ω
      A78-11 (RR+) - WK1-1 (RR+) Always Below 1 Ω
      A78-12 (RR-) - WK1-2 (RR-) Always Below 1 Ω
      Standard Resistance (for LHD)
      Tester Connection Condition Specified Condition
      A79-3 (RL+) - VK1-1 (RL+) Always Below 1 Ω
      A79-2 (RL-) - VK1-2 (RL-) Always Below 1 Ω
      A79-11 (RR+) - WK1-1 (RR+) Always Below 1 Ω
      A79-12 (RR-) - WK1-2 (RR-) Always Below 1 Ω

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    CHECK SKID CONTROL SENSOR (INPUT VOLTAGE)


    1. B0045KSC01
      *a

      Front view of wire harness connector

      (to Rear Speed Sensor)
      *b RH
      *c LH

      Disconnect the speed sensor connectors.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      V1-2 (+) - Body ground Ignition switch ON 5.7 to 17.3 V
      W1-2 (+) - Body ground Ignition switch ON 5.7 to 17.3 V
      Table 5. Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

  8. Click here

    RECONFIRM DTC


    1. Clear the DTC(s) (Click here).

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    4. Check if the same DTC(s) is output (Click here).

      Table 6. Result
      Result Proceed to
      DTC output A
      DTC not output B

  9. Click here

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (SKID CONTROL SENSOR AND REAR SPEED SENSOR ROTOR)


    1. Turn the ignition switch off.

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

      Tip:

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

      Because the rear axle hub and bearing assembly cannot be disassembled. if the rear skid control sensor needs replacement, replace the rear axle hub and bearing assembly.


  10. Click here

    RECONFIRM DTC


    1. Clear the DTC(s) (Click here).

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    4. Check if the same DTC(s) is output (Click here).

      Table 7. Result
      Result Proceed to
      DTC not output A
      DTC output (for LHD) B
      DTC output (for RHD) C