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Home >> Toyota >> 2011 >> Avalon V6-3.5L (2GR-FE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> DTC 31 >> Vehicle Stability Control System (from 12/2010) >> Vehicle Stability Control System - RM000001ITW007X

Vehicle Stability Control System - RM000001ITW007X





BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0200/31,C0205/32,C1235/35,C1236/36,C1271/71,C1272/72,C1275/75,C1276/76: Right Front Wheel Speed Sensor Signal Malfunction
C1276/76 - Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The speed sensor detects wheel speed and transmits the appropriate signals to the skid control ECU. These signals are used for control of the ABS system. Each of the front and rear rotors has 48 serrations.

When the rotors rotate, the magnetic field generated by the permanent magnet in the speed sensor induces AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the skid control ECU to detect the speed of each wheel.

DTCs C1271/71, C1272/72, C1275/75 and C1276/76 are output only in the Test Mode.









HINT
DTC No.C0200/31 and C1235/35 are for the front speed sensor RH.

DTC No.C0205/32 and C1236/36 are for the front speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the ABS & TRACTION actuator assembly, perform zero point calibration Calibration (from 12/2010).

HINT
Start the inspection from step 1 when using the Techstream and start from step3 when not using the Techstream.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC Check For Intermittent Problems.

ABS/VSC/TRAC





OK:

There are no momentary interruptions.

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

NG -- CHECK AND REPAIR HARNESS AND CONNECTOR (SPEED SENSOR CIRCUIT)
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Select the Data List mode on the Techstream.

ABS/VSC/TRAC





(d) 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.

OK:

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

NG -- INSPECT FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.

3. PERFORM TEST MODE (SIGNAL CHECK)

(a) Check if Test Mode DTCs are detected.

Result:





B -- INSPECT FRONT SPEED SENSOR INSTALLATION
A -- Continue to next step.

4. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS

(a) INSPECTION USING OSCILLOSCOPE





(1) Disconnect the front speed sensor connector.

(2) Connect the oscilloscope to terminals 1 and 2 of the front speed sensor.

(3) Check that a waveform is output when the tires are rotated.

OK:

A waveforms as shown in the figure should be output.

HINT
* As vehicle speed (wheel rotation speed) increases, the width of the waveform narrows and the fluctuation in the output voltage becomes greater.
* When noise is identified in the waveform on the oscilloscope, error signals are generated due to rotor scratches, looseness or foreign matter attached to the speed sensor.

NG -- INSPECT SPEED SENSOR TIP
OK -- Continue to next step.

5. RECONFIRM DTC

(a) Clear the DTC DTC Check / Clear (from 12/2010).

(b) Start the engine.

(c) Drive the vehicle at the speed of 32 km/h (20 mph) or more for 60 seconds or more.

(d) Check that the same DTC is recorded DTC Check / Clear (from 12/2010).

Result:





HINT
* These DTCs may be stored due to a malfunction in the connector terminal connection, etc.
* If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table (from 12/2010).

B -- INSPECT FRONT SPEED SENSOR INSTALLATION

A -- END

6. INSPECT FRONT SPEED SENSOR INSTALLATION

(a) Check the front speed sensor installation.





OK:

The installation bolt is tightened properly.

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

Torque : 8.0 Nm (82 kgf-cm, 71 in-lbf)

NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure (from 12/2010).

NG -- INSTALL FRONT SPEED SENSOR CORRECTLY OR REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.

7. INSPECT FRONT SPEED SENSOR

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





(b) Disconnect the front speed sensor connectors.

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

Standard resistance:

LH
RH










NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure (from 12/2010).

NG -- REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR TO SKID CONTROL ECU)

(a) Disconnect the skid control ECU connector and the front speed sensor connectors.





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

Standard resistance:

LH
RH










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (SPEED SENSOR CIRCUIT)
OK -- Continue to next step.

9. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS

(a) INSPECTION USING OSCILLOSCOPE





(1) Disconnect the front speed sensor connector.

(2) Connect the oscilloscope to terminals 1 and 2 of the front speed sensor.

(3) Check that a waveform is output when the tires are rotated.

OK:

A waveforms as shown in the figure should be output.

HINT
* As vehicle speed (wheel rotation speed) increases, the width of the waveform narrows and the fluctuation in the output voltage becomes greater.
* When noise is identified in the waveform on the oscilloscope, error signals are generated due to rotor scratches, looseness or foreign matter attached to the speed sensor.

NG -- INSPECT SPEED SENSOR TIP
OK -- Continue to next step.

10. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Select the Data List mode on the Techstream.

ABS/VSC/TRAC





(d) 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.

OK:

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

NG -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY
OK -- Continue to next step.

11. RECONFIRM DTC

(a) Clear the DTC DTC Check / Clear (from 12/2010).

(b) Start the engine.

(c) Drive the vehicle at the speed of 32 km/h (20 mph) or more for 60 seconds or more.

(d) Check that the same DTC is recorded DTC Check / Clear (from 12/2010).

Result:





HINT
These DTCs may be stored due to a malfunction in the connector terminal connection, etc.

B -- INSPECT SPEED SENSOR TIP

A -- END

12. INSPECT SPEED SENSOR TIP

(a) Remove the front speed sensor Removal.

(b) Check the sensor tip.

OK:

No scratches or foreign matter on the sensor tip.

NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure (from 12/2010).

NG -- CLEAN OR REPLACE SPEED SENSOR

OK -- CLEAN OR REPLACE SPEED SENSOR ROTOR
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