ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1466/33, C1467/34

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 engine switch off.

   3. Start the engine.

   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 C1467/34 are not output. A DTCs C1466/33 and/or C1467/34 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. 

      *1	Rear Speed Sensor
      *a	OK
      *b	NG

      Turn the engine 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. 

      *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 z35-1 (RR+) - X121-3 (RR+) Always Below 1 Ω z35-1 (RR+) - X121-4 (RR-) Always 10 MΩ or higher z35-1 (RR+) or X121-3 (RR+) - Body ground Always 10 MΩ or higher z35-2 (RR-) - X121-4 (RR-) Always Below 1 Ω z35-2 (RR-) - X121-3 (RR+) Always 10 MΩ or higher z35-2 (RR-) or X121-4 (RR-) - Body ground Always 10 MΩ or higher
      for LH Tester Connection Condition Specified Condition t1-2 (RL+) - tX2-3 Always Below 1 Ω t1-2 (RL+) - tX2-4 Always 10 MΩ or higher t1-2 (RL+) or tX2-3 - Body ground Always 10 MΩ or higher t1-1 (RL-) - tX2-4 Always Below 1 Ω t1-1 (RL-) - tX2-3 Always 10 MΩ or higher t1-1 (RL-) or tX2-4 - 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 A9 and A11 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 A11-22 (RR+) - X121-3 (RR+) Always Below 1 Ω A11-22 (RR+) or X121-3 (RR+) - Body ground Always 10 MΩ or higher A11-21 (RR-) - X121-4 (RR-) Always Below 1 Ω A11-21 (RR-) or X121-4 (RR-) - Body ground Always 10 MΩ or higher
      for LH Tester Connection Condition Specified Condition A9-34 (RL+) - tX2-3 Always Below 1 Ω A9-34 (RL+) or tX2-3 - Body ground Always 10 MΩ or higher A9-35 (RL-) - tX2-4 Always Below 1 Ω A9-35 (RL-) or tX2-4 - 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. 

      *a	Component with harness connected (Skid Control ECU Assembly)
      *b	Normal Signal Waveform

      Reconnect the A9 and A11 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 engine switch off.

    3. Start the engine.

    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

    
    

    A

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

    B

    USE SIMULATION METHOD TO CHECK Click here