DTC    C1273/73    Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)

DTC    C1274/74    Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DTC    C1466/33    Rear Speed Sensor RH Circuit

DTC    C1467/34    Rear Speed Sensor LH Circuit

for Preparation Click here


DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.
DTCs C1273/73 and C1274/74 can be 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.

C151818E06


DTC Code
INF Code
DTC Detection Condition
Trouble Area
C1466/33
521
While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Rear speed sensor RH
  6. Brake booster with master cylinder (Skid control ECU)
↑
522
A malfunction occurs in 2 or more wheels.
↑
↑
523
An open is detected in the speed sensor signal circuit for 0.05 seconds or more.
  1. Open or short in speed sensor
  2. Open or short in wire harness
  3. Improperly connected connector, deformation or corrosion of terminals
  4. Rear speed sensor RH
  5. Brake booster with master cylinder (Skid control ECU)
↑
524
Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Rear speed sensor RH
  6. Brake booster with master cylinder (Skid control ECU)
↑
526
When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.
  1. Open or short in wire harness
  2. Brake booster with master cylinder (Skid control ECU)
↑
527
While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Rear speed sensor RH
  6. Brake booster with master cylinder (Skid control ECU)
↑
528
When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.
  1. Open or short in wire harness
  2. Brake booster with master cylinder (Skid control ECU)
C1467/34
531
While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Rear speed sensor LH
  6. Brake booster with master cylinder (Skid control ECU)
↑
532
A malfunction occurs in 2 or more wheels.
↑
↑
533
An open is detected in the speed sensor signal circuit for 0.05 seconds or more.
  1. Open or short in speed sensor
  2. Open or short in wire harness
  3. Improperly connected connector, deformation or corrosion of terminals
  4. Rear speed sensor LH
  5. Brake booster with master cylinder (Skid control ECU)
↑
534
Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Rear speed sensor LH
  6. Brake booster with master cylinder (Skid control ECU)
↑
536
When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.
  1. Open or short in wire harness
  2. Brake booster with master cylinder (Skid control ECU)
↑
537
While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.
  1. Open or short in speed sensor
  2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  3. Open or short in wire harness
  4. Improperly connected connector, deformation or corrosion of terminals
  5. Rear speed sensor LH
  6. Brake booster with master cylinder (Skid control ECU)
↑
538
When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.
  1. Open or short in wire harness
  2. Brake booster with master cylinder (Skid control ECU)
C1273/73
C1274/74
-
Detected only during Test Mode.
  1. Rear speed sensor RH/LH
  2. Sensor installation
  3. Speed sensor rotor

HINT:
  1. DTCs C1466/33 and C1273/73 are for the rear speed sensor RH.
  2. DTCs C1467/34 and C1274/74 are for the rear speed sensor LH.


WIRING DIAGRAM


C220952E03


INSPECTION PROCEDURE

NOTICE:
When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve (Click here).

1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the intelligent tester, check for any momentary interruptions in the wire harness and connector corresponding to a DTC (Click here).

    ABS/VSC/TRC 
    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
    		-

    OK:
    There are no momentary interruptions.

    HINT:
    Perform the above inspection before removing the sensor and connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.READ VALUE USING INTELLIGENT TESTER (REAR SPEED SENSOR)

  1. Select the Data List on the intelligent tester (Click here).

    ABS/VSC/TRC 
    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

  1. Check that the speed value output from the speed sensor displayed on the intelligent tester.

    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. 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 intelligent tester is the similar speed as indicated on the speedometer.



NG
Go to step 5
OK


3.PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

  1. Turn the power switch off.

  1. Perform the sensor check in the Test Mode procedure (Click here).

    OK:
    All Test Mode DTCs are cleared.



NG
Go to step 5
OK


4.RECONFIRM DTC

  1. Turn the power switch off.

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1466/33 and C1467/34) are not output
    		A
    DTCs (C1466/33 and/or C1467/34) are output
    		B

    HINT:
    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
Go to step 10
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)  

5.CHECK REAR SPEED SENSOR INSTALLATION


    C144931E02

  1. Turn the power switch off.

  1. Check the speed sensor installation.

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



NG
INSTALL REAR SPEED SENSOR CORRECTLY (Click here)
OK


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


    C151832E15

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

  1. Disconnect the rear speed sensor connector and the skid control sensor wire.

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

    Standard Resistance:
    for RH:
    Tester Connection
    		Condition
    		Specified Condition
    b2-2 - bQ1-1
    		Always
    		Below 1 Ω
    b2-2 - bQ1-2
    		Always
    		10 kΩ or higher
    b2-2 - Body ground
    		Always
    		10 kΩ or higher
    b2-1 - bQ1-2
    		Always
    		Below 1 Ω
    b2-1 - bQ1-1
    		Always
    		10 kΩ or higher
    b2-1 - Body ground
    		Always
    		10 kΩ or higher
    for LH:
    Tester Connection
    		Condition
    		Specified Condition
    b1-2 - bP1-1
    		Always
    		Below 1 Ω
    b1-2 - bP1-2
    		Always
    		10 kΩ or higher
    b1-2 - Body ground
    		Always
    		10 kΩ or higher
    b1-1 - bP1-2
    		Always
    		Below 1 Ω
    b1-1 - bP1-1
    		Always
    		10 kΩ or higher
    b1-1 - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *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)

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



NG
REPLACE SKID CONTROL SENSOR WIRE (Click here)
OK


7.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL SENSOR WIRE)

  1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

  1. Disconnect the skid control ECU connector.

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

    Standard Resistance:
    for RH:
    Tester Connection
    		Condition
    		Specified Condition
    A61-22 (RR+) - bQ1-1 (RR+)
    		Always
    		Below 1 Ω
    A61-22 (RR+) - Body ground
    		Always
    		10 kΩ or higher
    A61-9 (RR-) - bQ1-2 (RR-)
    		Always
    		Below 1 Ω
    A61-9 (RR-) - Body ground
    		Always
    		10 kΩ or higher
    for LH:
    Tester Connection
    		Condition
    		Specified Condition
    A61-20 (RL+) - bP1-1 (RL+)
    		Always
    		Below 1 Ω
    A61-20 (RL+) - Body ground
    		Always
    		10 kΩ or higher
    A61-7 (RL-) - bP1-2 (RL-)
    		Always
    		Below 1 Ω
    A61-7 (RL-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    C213978E02

  1. Reconnect the skid control ECU connector.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    for RH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    bQ1-1 (RR+) - Body ground
    		Power switch on (IG)
    		5.7 to 14 V
    for LH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    bP1-1 (RL+) - Body ground
    		Power switch on (IG)
    		5.7 to 14 V

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

    Result:

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



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)
A


9.RECONFIRM DTC

  1. Turn the power switch off.

  1. Reconnect the rear speed sensor connector and the skid control sensor wire.

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1466/33 and/or C1467/34) are output
    		A
    DTCs (C1466/33 and C1467/34) are not output
    		B

    HINT:
    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
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A


10.REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

  1. Turn the power switch off.

  1. Replace the rear speed sensor and the rear axle hub and bearing assembly (rear speed sensor rotor) (Click here).

    HINT:
    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 with rear speed sensor.

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


NEXT


11.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1466/33 and/or C1467/34) are output (for LHD)
    		A
    DTCs (C1466/33 and/or C1467/34) are output (for RHD)
    		B
    DTCs (C1466/33 and C1467/34) are not output
    		C

    HINT:
    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
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
END
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)