ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1271/71, C1272/72, C1464/31, C1465/32

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   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).

      Table 2. ABS/VSC/TRC

      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	-

      OK
      There are no momentary interruptions.

      Tip:

      Perform the above inspection before removing the sensor and connector.

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

2. Click here

   READ VALUE USING GTS (FRONT SPEED SENSOR)

   
   

   1. Select the Data List on the GTS (Click here).

      Table 3. ABS/VSC/TRC

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      FR Wheel Speed	Front 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
      FL Wheel Speed	Front 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

   2. Check the speed value output from the speed sensor displayed on the GTS.

      Tip:

      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. 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.

   
   
   • OKClick here
   • NGClick here
3. Click here

   PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

   
   

   1. Turn the power switch off.

   2. Perform the sensor check in Test Mode Procedure (Click here).

      OK
      All Test Mode DTCs are cleared.

   
   
   • OKClick here
   • NGClick here
4. Click here

   RECONFIRM DTC

   
   

   1. Turn the power switch off.

   2. Clear the DTCs (Click here).

   3. Turn the power switch on (READY).

   4. Perform a road test.

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

      Result
      Result Proceed to DTCs C1464/31 and C1465/32 are not output. A DTCs C1464/31 and/or C1465/32 are output. B

      Tip:

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).

   
   
   • A

     USE SIMULATION METHOD TO CHECK (Click here)

   • BClick here
5. Click here

   CHECK FRONT SPEED SENSOR INSTALLATION

   
   
   1. 

      Turn the power switch off.

   2. Check the speed sensor installation.

      OK
      There is no clearance between the sensor and the front steering knuckle.
      The installation bolt is tightened properly.
      Torque
      8.5 N*m (87 kgf*cm, 75 in.*lbf)

   
   
   • OKClick here
   • NG

     INSTALL FRONT SPEED SENSOR CORRECTLY (Click here)

6. Click here

   CHECK FRONT SPEED SENSOR TIP

   
   

   1. Remove the front speed sensor (Click here).

   2. Check the speed sensor tip.

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

      Note:

      Check the speed sensor signal after cleaning or replacement (Click here).

   
   
   • OKClick here
   • NG

     CLEAN OR REPLACE FRONT SPEED SENSOR

7. Click here

   CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - FRONT SPEED SENSOR)

   
   

   1. Install the front speed sensor.

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

   3. Disconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector.

   4. Disconnect the A44 or A16 front speed sensor connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition A24-18 (FR+) - A44-1 (FR+) Always Below 1 Ω A24-18 (FR+) - Body ground Always 10 kΩ or higher A24-5 (FR-) - A44-2 (FR-) Always Below 1 Ω A24-5 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition A24-31 (FL+) - A16-1 (FL+) Always Below 1 Ω A24-31 (FL+) - Body ground Always 10 kΩ or higher A24-32 (FL-) - A16-2 (FL-) Always Below 1 Ω A24-32 (FL-) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

8. Click here

   INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

   
   
   1. 

      Reconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector.

   2. Turn the power switch on (IG).

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

      Standard Voltage
      for RH
      Tester Connection Condition Specified Condition A44-1 (FR+) - Body ground Power switch on (IG) 5.7 to 14 V
      for LH
      Tester Connection Condition Specified Condition A16-1 (FL+) - Body ground Power switch on (IG) 5.7 to 14 V

      Table 4. Text in Illustration

      *a	Front view of wire harness connector (to Front Speed Sensor)

      Result
      Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   
   
   • AClick here
   • B

     REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

   • C

     REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

9. Click here

   RECONFIRM DTC

   
   

   1. Turn the power switch off.

   2. Reconnect the A44 or A16 front speed sensor connector.

   3. Clear the DTCs (Click here).

   4. Turn the power switch on (READY).

   5. Perform a road test.

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

      Result
      Result Proceed to DTCs C1464/31 and/or C1465/32 are output. A DTCs C1464/31 and C1465/32 are not output. B

      Tip:

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).

   
   
   • AClick here
   • B

     USE SIMULATION METHOD TO CHECK (Click here)

10. Click here

    REPLACE FRONT SPEED SENSOR

    
    

    1. Turn the power switch off.

    2. Replace the front speed sensor (Click here).

       Note:

       Check the speed sensor signal after replacement (Click here).

    
    
    • NEXTClick here
11. Click here

    RECONFIRM DTC

    
    

    1. Clear the DTCs (Click here).

    2. Turn the power switch on (READY).

    3. Perform a road test.

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

       Result
       Result Proceed to DTCs C1464/31 and/or C1465/32 are output. A DTCs C1464/31 and C1465/32 are not output. B

       Tip:

       If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).

    
    
    • AClick here
    • B

      END

12. Click here

    REPLACE FRONT DRIVE OUTBOARD JOINT SHAFT ASSEMBLY

    
    

    1. Turn the power switch off.

    2. Replace the front speed sensor rotor (front drive outboard joint shaft assembly) (Click here).

       Tip:

       If the front speed sensor rotor needs to be replaced, replace the front drive outboard joint shaft assembly.

       Note:

       Check the speed sensor signal after replacement (Click here).

    
    
    • NEXTClick here
13. Click here

    RECONFIRM DTC

    
    

    1. Clear the DTCs (Click here).

    2. Turn the power switch on (READY).

    3. Perform a road test.

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

       Result
       Result Proceed to DTCs C1464/31 and/or C1465/32 are output (for LHD). A DTCs C1464/31 and/or C1465/32 are output (for RHD). B DTCs C1464/31 and C1465/32 are not output. C

       Tip:

       If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).

    
    
    • A

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • B

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • C

      END