ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1273/73, C1274/74, C1466/33, C1467/34

DESCRIPTION

Each speed sensor detects the wheel speed and sends the signals to the skid control ECU (brake booster with master cylinder assembly). These signals are used for ABS control.

DTCs C1273/73 and C1274/74 are cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1273/73 and C1274/74 are output only in Test Mode.

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.

      Tech Tips

      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.

      Result
      Proceed to OK NG

   
   

   NG

   GO TO STEP 5 Click here

   OK

3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

   
   

   1. Turn the power switch off.

   2. Perform the sensor check in Test Mode Procedure.

      Click here

      
      Chassis > ABS/VSC/TRC > Utility

      Tester Display
      Signal Check

      OK
      All Test Mode DTCs are cleared.

      Result
      Proceed to OK NG

   
   

   NG

   GO TO STEP 5 Click here

   OK

4. RECONFIRM DTC

   
   

   1. Turn the power switch off.

   2. Clear the DTCs.

      Click here

      
      Chassis > ABS/VSC/TRC > Clear DTCs

   3. Turn the power switch on (READY).

   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

      Tech Tips

      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

   B

   GO TO STEP 10 Click here

5. CHECK REAR SPEED SENSOR INSTALLATION

   
   
   1. 

      *1	Rear Speed Sensor
      *a	No clearance
      *b	OK
      *c	NG

      Turn the power switch off.

   2. Check the speed sensor installation.

      OK
      There is no clearance between the sensor and rear axle carrier.

      Result
      Proceed to OK NG

   
   

   NG

   INSTALL REAR SPEED SENSOR CORRECTLY Click here

   OK

6. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)

   
   
   1. 

      *A	for RH
      *B	for LH
      *a	Front view of skid control sensor wire
      *b	Front view of wire harness connector (to Sensor Side Connector)
      *c	Front view of wire harness connector (to Vehicle Side Connector)

      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.

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

      Standard Resistance
      for RH Tester Connection Condition Specified Condition h1-2 (RR+) - hL1-1 (RR+) Always Below 1 Ω h1-2 (RR+) - hL1-2 (RR-) Always 10 kΩ or higher h1-2 (RR+) - Body ground Always 10 kΩ or higher hL1-1 (RR+) - Body ground Always 10 kΩ or higher h1-1 (RR-) - hL1-2 (RR-) Always Below 1 Ω h1-1 (RR-) - hL1-1 (RR+) Always 10 kΩ or higher h1-1 (RR-) - Body ground Always 10 kΩ or higher hL1-2 (RR-) - Body ground Always 10 kΩ or higher
      for LH Tester Connection Condition Specified Condition j1-2 (RL+) - jL1-1 (RL+) Always Below 1 Ω j1-2 (RL+) - jL1-2 (RL-) Always 10 kΩ or higher j1-2 (RL+) - Body ground Always 10 kΩ or higher jL1-1 (RL+) - Body ground Always 10 kΩ or higher j1-1 (RL-) - jL1-2 (RL-) Always Below 1 Ω j1-1 (RL-) - jL1-1 (RL+) Always 10 kΩ or higher j1-1 (RL-) - Body ground Always 10 kΩ or higher jL1-2 (RL-) - Body ground Always 10 kΩ 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

7. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER 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 A144 skid control ECU (brake booster with master cylinder assembly) connector.

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

      Standard Resistance
      for RH Tester Connection Condition Specified Condition A144-22 (RR+) - hL1-1 (RR+) Always Below 1 Ω A144-22 (RR+) - Body ground Always 10 kΩ or higher hL1-1 (RR+) - Body ground Always 10 kΩ or higher A144-9 (RR-) - hL1-2 (RR-) Always Below 1 Ω A144-9 (RR-) - Body ground Always 10 kΩ or higher hL1-2 (RR-) - Body ground Always 10 kΩ or higher
      for LH Tester Connection Condition Specified Condition A144-20 (RL+) - jL1-1 (RL+) Always Below 1 Ω A144-20 (RL+) - Body ground Always 10 kΩ or higher jL1-1 (RL+) - Body ground Always 10 kΩ or higher A144-7 (RL-) - jL1-2 (RL-) Always Below 1 Ω A144-7 (RL-) - Body ground Always 10 kΩ or higher jL1-2 (RL-) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

8. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

   
   
   1. 

      *a	Front view of wire harness connector (to Skid Control Sensor Wire)

      Reconnect the A144 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 hL1-1 (RR+) - Body ground Power switch on (IG) 5.7 to 14 V
      for LH Tester Connection Condition Specified Condition jL1-1 (RL+) - Body ground Power switch on (IG) 5.7 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

   OK

9. RECONFIRM DTC

   
   

   1. Turn the power switch off.

   2. Install the skid control sensor wire.

   3. Clear the DTCs.

      Click here

      
      Chassis > ABS/VSC/TRC > Clear DTCs

   4. Turn the power switch on (READY).

   5. Perform a road test.

   6. 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

      Tech Tips

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

      Click here

   
   

   B

   USE SIMULATION METHOD TO CHECK Click here

   A

10. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

    
    

    1. Turn the power switch off.

    2. Replace the rear speed sensor rotor with rear speed sensor (rear axle hub and bearing assembly).

       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 the rear axle hub and bearing assembly with rear speed sensor.

       Note

       Check the speed sensor signal after replacement.

       Click here

       Result
       Proceed to NEXT

    
    

    NEXT

11. RECONFIRM DTC

    
    

    1. Clear the DTCs.

       Click here

       
       Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. 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

       Tech Tips

       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 for LHD: Click here REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    B

    END