ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster), Diagnostic DTC:C1403, C1404

DTC Code DTC Name
C1403 Rear Speed Sensor RH Malfunction
C1404 Rear Speed Sensor LH Malfunction

DESCRIPTION

Refer to DTCs C1415 and C1416.

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DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1403 Rear Speed Sensor RH Malfunction

Any of the following is detected:


  • At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more*2.

  • At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 30 seconds or more*1.

  • At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.

  • At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more*2.

  • At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 30 seconds or more*1.

  • Sensor installation

  • Rear speed sensor RH

  • Skid control sensor wire RH

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

  • Wire harness or connector

 -
C1404 Rear Speed Sensor LH Malfunction

Any of the following is detected:


  • At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more*2.

  • At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 30 seconds or more*1.

  • At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.

  • At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more*2.

  • At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 30 seconds or more*1.

  • Sensor installation

  • Rear speed sensor LH

  • Skid control sensor wire LH

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

  • Wire harness or connector

 -

C1403 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition - - - - - -
Malfunction Status At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*2 ○ - - - -
At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*1 - ○ - - -
At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) - - ○ - -
At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph)*2 - - - ○ -
At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph)*1 - - - - ○
Detection Time 15 seconds or more. 30 seconds or more. 1 second or more. 15 seconds or more. 30 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

C1404 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition - - - - - -
Malfunction Status At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*2 ○ - - - -
At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*1 - ○ - - -
At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) - - ○ - -
At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph)*2 - - - ○ -
At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph)*1 - - - - ○
Detection Time 15 seconds or more. 30 seconds or more. 1 second or more. 15 seconds or more. 30 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

Refer to DTCs C1415 and C1416.

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PROCEDURE


  1. CHECK REAR SPEED SENSOR INSTALLATION


    1. Turn the engine switch off.

    2. B006F78C14
      *a Normal
      *b Abnormal
      *c Clearance

      Check the speed sensor installation.

      Click here

      OK
      There is no clearance between the sensor and rear axle carrier.
      The installation bolt is tightened properly.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL REAR SPEED SENSOR CORRECTLY Click here

    OK

  2. CHECK REAR SPEED SENSOR (CHECK FOR FOREIGN MATTER)


    1. Remove the rear speed sensor.

      Click here

    2. Check the rear speed sensor tip.

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

      Note


      • If there is oil or foreign matter on the speed sensor, clean the speed sensor.

      • If the speed sensor is damaged, replace the speed sensor with a new one.

      • Check the speed sensor signal after cleaning or replacement.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE REAR SPEED SENSOR

    OK

  3. READ VALUE USING GTS (REAR SPEED SENSOR)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Data List using the GTS.

      Click here


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

    4. 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 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 here

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

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  4. INSPECT SKID CONTROL SENSOR WIRE


    1. B006GRGC16
      *A for RH
      *B for LH
      *1 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. Disconnect the z24, L178, L175 and/or LL4 skid control sensor wire connector.

    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
      L178 -2 (RL+) - LL4 -3 Always Below 1 Ω
      L178 -2 (RL+) - LL4 -4 Always 10 MΩ or higher
      L178 -2 (RL+) or LL4 -3 - Body ground Always 10 MΩ or higher
      L178 -1 (RL-) - LL4 -4 Always Below 1 Ω
      L178 -1 (RL-) - LL4 -3 Always 10 MΩ or higher
      L178 -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

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR 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 A9 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A9-16 (RR+) - L175-3 (RR+) Always Below 1 Ω
      A9-16 (RR+) or L175-3 (RR+) - Body ground Always 10 kΩ or higher
      A9-15 (RR-) - L175-4 (RR-) Always Below 1 Ω
      A9-15 (RR-) or L175-4 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A9-29 (RL+) - LL4 -3 Always Below 1 Ω
      A9-29 (RL+) or LL4 -3 - Body ground Always 10 kΩ or higher
      A9-28 (RL-) - LL4 -4 Always Below 1 Ω
      A9-28 (RL-) or LL4 -4 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK REAR SPEED SENSOR ROTOR (CHECK FOR FOREIGN MATTER)


    1. Remove the component with the speed sensor rotor.

      Click here

    2. Check the speed sensor rotor.

      OK
      The rotor is free of scratches, oil, and foreign matter.

      Note


      • If there is oil or foreign matter on the speed sensor rotor, clean the speed sensor rotor.

      • If the speed sensor rotor is damaged, replace the speed sensor rotor with a new one.

      • Check the speed sensor signal after cleaning or replacement.

        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 it together with the rear axle hub and bearing assembly.

      Result
      Result Proceed to
      OK A
      NG (The speed sensor rotor is damaged.) B
      NG (There is foreign matter on the speed sensor rotor.) C

    A

    REPLACE REAR SPEED SENSOR Click here

    B

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here

    C

    CLEAN REAR SPEED SENSOR ROTOR