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Home >> Lexus >> 2009 >> LS 460L AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Brake Control >> Electronically Controlled Brake System >> DTC C0200/31 Front Speed Sensor RH Circuit; DTC C0205/32 Front Speed Sensor LH Circuit; DTC C1271/71 Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272/72 Low Output Signal of Front Speed Sensor LH (Test Mode DTC) >> Inspection Procedure
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Inspection Procedure

NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (see CALIBRATION  ).

HINT:

Start the inspection from "CHECK HARNESS AND CONNECTOR" when using the Techstream and start from "PERFORM TEST MODE" when not using the Techstream.

  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC (see CHECK FOR INTERMITTENT PROBLEMS  ).

      ABS/VSC/TRAC 

      TESTER DISPLAY REFERENCE CHART

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Speed Open Front speed sensor RH open detection/ERROR or NORMAL ERROR: Momentary interruption
      NORMAL: Normal      		 -
      FL Speed Open Front speed sensor LH open detection/ERROR or NORMAL ERROR: Momentary interruption
      NORMAL: Normal      		 -

      Result 

      RESULT CHART

      Result Proceed to
      There are momentary interruptions A
      There are no momentary interruptions B
      There is a constant open circuit (for 2WD) C
      There is a constant open circuit (for AWD) D

      HINT:

      Perform the above inspection before removing the sensor and connector.

      B:  Go to step  4

      C:  Go to step  7

      D:  Go to step  14

      A: Go to Next Step 

  2. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) 
    1. Turn the engine switch off.
    2. Repair or replace the harness or connector.
    3. Check for any momentary interruption between the skid control ECU and the front speed sensor (see CHECK FOR INTERMITTENT PROBLEMS  ).
  3. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Clear the DTCs (see DTC CHECK/CLEAR  ).
    3. Start the engine.
    4. Drive the vehicle at a speed of 32 km/h (20 mph) or more for at least 60 seconds.
    5. Check if the same DTC is recorded (see DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTCs C0200/31 and/or C0205/32 are output A
      DTCs C0200/31 and C0205/32 are not output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE  ).

      B: END 

      A: Go to Next Step 

  4. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Start the engine.
    4. Select the Data List mode on the Techstream (see DATA LIST/ACTIVE TEST  ).

      ABS/VSC/TRAC 

      TESTER DISPLAY REFERENCE CHART

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Speed Front speed sensor RH reading/min.: 0 km/h (0 mph), max.: 326.4 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
      FL Wheel Speed Front speed sensor LH reading/min.: 0 km/h (0 mph), max.: 326.4 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
    5. Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.

      HINT:

      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. The margin of error can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart (see OPERATION CHECK ).

      OK: The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed. 

      ABS/VSC/TRAC 

      TESTER DISPLAY REFERENCE CHART

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Direction Front wheel RH direction/FORWARD or BACK FORWARD: Forward
      BACK: Backward      		 -
      FL Wheel Direction Front wheel LH direction/FORWARD or BACK FORWARD: Forward
      BACK: Backward      		 -
    6. Check that the sensor signal conforms to the wheel rotation direction.

      OK: The correct wheel rotation direction is displayed. 

      Result 

      RESULT CHART

      Result Proceed to
      OK A
      NG (for 2WD) B
      NG (for AWD) C

      B:  Go to step  7

      C:  Go to step  14

      A: Go to Next Step 

  5. PERFORM TEST MODE (SIGNAL CHECK) 
    1. Turn the engine switch off.
    2. Perform the sensor check in test mode (see TEST MODE PROCEDURE  ).

      OK: All test mode DTCs are cleared. 

      Result 

      RESULT CHART

      Result Proceed to
      OK A
      NG (for 2WD) B
      NG (for AWD) C

      B:  Go to step  7

      C:  Go to step  14

      A: Go to Next Step 

  6. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Clear the DTCs (see DTC CHECK/CLEAR  ).
    3. Start the engine.
    4. Drive the vehicle at a speed of 32 km/h (20 mph) or more for at least 60 seconds.
    5. Check if the same DTC is recorded (see DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTCs C0200/31 and/or C0205/32 are not output A
      DTCs C0200/31 and/or C0205/32 are output (for 2WD) B
      DTCs C0200/31 and/or C0205/32 are output (for AWD) C

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE  ).

      B:  Go to step  12

      C:  Go to step  20

      A: CHECK FOR INTERMITTENT PROBLEMS  (See HOW TO PROCEED WITH TROUBLESHOOTING )

  7. CHECK FRONT SPEED SENSOR INSTALLATION 
    1. Turn the engine switch off.
    2. Check the speed sensor installation.

      OK: There is no clearance between the sensor and the front steering knuckle. 

      NOTE: Check the speed sensor signal after the installation (see TEST MODE PROCEDURE  ).
      Fig 1: Checking Front Speed Sensor Installation
      G05752567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE FRONT AXLE HUB SUB-ASSEMBLY 

      OK: Go to Next Step 

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE) 
    1. Check that there is no looseness at the locking part and the connecting part of the connectors.
    2. Disconnect the skid control sensor wire.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance: 

      for RH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      "A"-2 (FR+) - "B"-2 Always Below 1 Ω
      "A"-2 (FR+) - "B"-1 Always 10 kΩ or higher
      "A"-2 (FR+) - Body ground Always 10 kΩ or higher
      "A"-1 (FR-) - "B"-1 Always Below 1 Ω
      "A"-1 (FR-) - "B"-2 Always 10 kΩ or higher
      "A"-1 (FR-) - Body ground Always 10 kΩ or higher

      for LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      "A"-1 (FL+) - "B"-1 Always Below 1 Ω
      "A"-1 (FL+) - "B"-2 Always 10 kΩ or higher
      "A"-1 (FL+) - Body ground Always 10 kΩ or higher
      "A"-2 (FL-) - "B"-2 Always Below 1 Ω
      "A"-2 (FL-) - "B"-1 Always 10 kΩ or higher
      "A"-2 (FL-) - Body ground Always 10 kΩ or higher
      Fig 2: Identifying Front Speed Sensor RH And LH Connector Terminals
      G04949604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE  ).

      NG: REPLACE SKID CONTROL SENSOR WIRE 

      OK: Go to Next Step 

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) 
    1. Disconnect the A19 and A21 ECU connectors.
    2. Disconnect the A55 sensor connector.
    3. Disconnect the A5 sensor connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance: 

      for RH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      A19-16 (FR+) - A55-2 (FR+) Always Below 1 Ω
      A19-15 (FR-) - A55-1 (FR-) Always Below 1 Ω
      A19-16 (FR+) - Body ground Always 10 kΩ or higher
      A19-15 (FR-) - Body ground Always 10 kΩ or higher

      for LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      A21-16 (FL+) - A5-1 (FL+) Always Below 1 Ω
      A21-15 (FL-) - A5-2 (FL-) Always Below 1 Ω
      A21-16 (FL+) - Body ground Always 10 kΩ or higher
      A21-15 (FL-) - Body ground Always 10 kΩ or higher
      Fig 3: Identifying A19, A21, A55 And A5 Connector Terminals
      G04949605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  10. INSPECT SKID CONTROL ECU (SENSOR INPUT) 
    1. Reconnect the A19 and A21 ECU connectors.
    2. Disconnect the A55 sensor connector.
    3. Disconnect the A5 sensor connector.
    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      A55-2 (FR+) - Body ground Engine switch on (IG) 6.7 to 14 V
      A5-1 (FL+) - Body ground Engine switch on (IG) 6.7 to 14 V
      Fig 4: Identifying A55 And A5 Sensor Connector Terminals
      G04949606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE SKID CONTROL ECU (See  REMOVAL   ) 

      OK: Go to Next Step 

  11. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Reconnect the front speed sensor connector.
    3. Clear the DTCs (see DTC CHECK/CLEAR  ).
    4. Start the engine.
    5. Drive the vehicle at a speed of 32 km/h (20 mph) or more for at least 60 seconds.
    6. Check if the same DTC is recorded (see DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTCs C0200/31 and/or C0205/32 are output A
      DTCs C0200/31 and C0205/32 are not output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE  ).

      B: CHECK FOR INTERMITTENT PROBLEMS  (See HOW TO PROCEED WITH TROUBLESHOOTING )

      A: Go to Next Step 

  12. REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR 
    1. Turn the engine switch off.
    2. Replace the front axle hub sub-assembly (front speed sensor rotor and front speed sensor) (see REMOVAL ).

      HINT:

      The front speed sensor rotor and front speed sensor are built into the front axle hub sub-assembly. If the front speed sensor rotor and front speed sensor needs to be replaced, replace the front axle hub sub-assembly.

      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE  ).
  13. RECONFIRM DTC 
    1. Clear the DTCs (see DTC CHECK/CLEAR  ).
    2. Start the engine.
    3. Drive the vehicle at a speed of 32 km/h (20 mph) or more for at least 60 seconds.
    4. Check if the same DTC is recorded (see DTC CHECK/CLEAR  ).

      HINT:

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result 

      RESULT CHART

      Result Proceed to
      DTCs C0200/31 and/or C0205/32 are output A
      DTCs C0200/31 and C0205/32 are not output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE  ).

      B: END 

      A: REPLACE SKID CONTROL ECU (See  REMOVAL   ) 

  14. CHECK FRONT SPEED SENSOR INSTALLATION 
    1. Turn the engine switch off.
    2. Check the speed sensor installation.

      OK: There is no clearance between the sensor and the front steering knuckle. 

      The installation nut is tightened properly. 

      Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf) 

      NOTE: Check the speed sensor signal after the installation (see TEST MODE PROCEDURE  ).
      Fig 5: Checking Front Speed Sensor Installation
      G05806993Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: INSTALL FRONT SPEED SENSOR CORRECTLY 

      OK: Go to Next Step 

  15. CHECK FRONT SPEED SENSOR TIP 
    1. Remove the front speed sensor (see REMOVAL  ).
    2. Check the speed sensor tip.

      OK: No scratches, oil, or foreign matter on the sensor tip. 

      NOTE: Check the speed sensor signal after cleaning or replacement (see TEST MODE PROCEDURE  ).

      NG: CLEAN OR REPLACE FRONT SPEED SENSOR 

      OK: Go to Next Step 

  16. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE) 
    1. Check that there is no looseness at the locking part and the connecting part of the connectors.
    2. Disconnect the skid control sensor wire.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance: 

      for RH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      "A"-2 (FR+) - "B"-2 Always Below 1 Ω
      "A"-2 (FR+) - "B-1 Always 10 kΩ or higher
      "A"-2 (FR+) - Body ground Always 10 kΩ or higher
      "A"-1 (FR-) - "B"-1 Always Below 1 Ω
      "A"-1 (FR-) - "B"-2 Always 10 kΩ or higher
      "A"-1 (FR-) - Body ground Always 10 kΩ or higher

      for LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      "A"-1 (FL+) - "B"-1 Always Below 1 Ω
      "A"-1 (FL+) - "B"-2 Always 10 kΩ or higher
      "A"-1 (FL+) - Body ground Always 10 kΩ or higher
      "A"-2 (FL-) - "B"-2 Always Below 1 Ω
      "A"-2 (FL-) - "B"-1 Always 10 kΩ or higher
      "A"-2 (FL-) - Body ground Always 10 kΩ or higher
      Fig 6: Identifying Front Speed Sensor RH And LH Connector Terminals
      G04949604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE  ).

      NG: REPLACE SKID CONTROL SENSOR WIRE 

      OK: Go to Next Step 

  17. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) 
    1. Disconnect the A19 and A21 ECU connectors.
    2. Disconnect the A55 sensor connector.
    3. Disconnect the A5 sensor connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance: 

      for RH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      A19-16 (FR+) - A55-2 (FR+) Always Below 1 Ω
      A19-15 (FR-) - A55-1 (FR-) Always Below 1 Ω
      A19-16 (FR+) - Body ground Always 10 kΩ or higher
      A19-15 (FR-) - Body ground Always 10 kΩ or higher

      for LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      A21-16 (FL+) - A5-1 (FL+) Always Below 1 Ω
      A21-15 (FL-) - A5-2 (FL-) Always Below 1 Ω
      A21-16 (FL+) - Body ground Always 10 kΩ or higher
      A21-15 (FL-) - Body ground Always 10 kΩ or higher
      Fig 7: Identifying A19, A21, A55 And A5 Connector Terminals
      G04949605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  18. INSPECT SKID CONTROL ECU (SENSOR INPUT) 
    1. Reconnect the A19 and A21 ECU connectors.
    2. Disconnect the A55 sensor connector.
    3. Disconnect the A5 sensor connector.
    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      A55-2 (FR+) - Body ground Engine switch on (IG) 6.7 to 14 V
      A5-1 (FL+) - Body ground Engine switch on (IG) 6.7 to 14 V
      Fig 8: Identifying A55 And A5 Sensor Connector Terminals
      G04949606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE SKID CONTROL ECU (See  REMOVAL   ) 

      OK: Go to Next Step 

  19. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Reconnect the front speed sensor connector.
    3. Clear the DTCs (see DTC CHECK/CLEAR  ).
    4. Start the engine.
    5. Drive the vehicle at a speed of 32 km/h (20 mph) or more for at least 60 seconds.
    6. Check if the same DTC is recorded (see DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTCs C0200/31 and/or C0205/32 are output A
      DTCs C0200/31 and C0205/32 are not output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE  ).

      B: CHECK FOR INTERMITTENT PROBLEMS  (See HOW TO PROCEED WITH TROUBLESHOOTING )

      A: Go to Next Step 

  20. REPLACE FRONT SPEED SENSOR 
    1. Turn the engine switch off.
    2. Replace the front speed sensor (see REMOVAL  ).
      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE  ).
  21. RECONFIRM DTC 
    1. Clear the DTCs (see DTC CHECK/CLEAR  ).
    2. Start the engine.
    3. Drive the vehicle at a speed of 32 km/h (20 mph) or more for at least 60 seconds.
    4. Check if the same DTC is recorded (see DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTCs C0200/31 and/or C0205/32 are output A
      DTCs C0200/31 and C0205/32 are not output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE  ).

      B: END 

      A: Go to Next Step 

  22. REPLACE FRONT SPEED SENSOR ROTOR 
    1. Turn the engine switch off.
    2. Replace the front axle hub sub-assembly (front speed sensor rotor) (see REMOVAL ).

      HINT:

      The front speed sensor rotor is built into the front axle hub sub-assembly. If the front speed sensor rotor needs to be replaced, replace the front axle hub sub-assembly.

      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE  ).
  23. RECONFIRM DTC 
    1. Clear the DTCs (see DTC CHECK/CLEAR  ).
    2. Start the engine.
    3. Drive the vehicle at a speed of 32 km/h (20 mph) or more for at least 60 seconds.
    4. Check if the same DTC is recorded (see DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTCs C0200/31 and/or C0205/32 are output A
      DTCs C0200/31 and C0205/32 are not output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE  ).

      B: END 

      A: REPLACE SKID CONTROL ECU (See  REMOVAL   ) 

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