Inspection Procedure

1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (See 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 : Go to step  4

OK : Go to Next Step 

1. Turn the ignition 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: 

   ABS/VSC/TRAC REFERENCE CHART
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   FR Wheel Speed	FR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326.4 km/h (202.8 mph)	Actual wheel speed	Similar to speed indicated on the speedometer.
   FL Wheel Speed	FL wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326.4 km/h (202.8 mph)	Actual wheel speed	Similar to speed indicated on the 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. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart (See DIAGNOSTIC TROUBLE CODE CHART ).

   OK: The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer). 

   NG : Go to step  4

   OK : Go to Next Step 

1. Turn the ignition switch off.
2. Clear the DTCs (See DTC CHECK / CLEAR ).
3. Start the engine.
4. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.
5. Check if the same DTC is output (See DTC CHECK / CLEAR ).

Result 

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 : REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL )

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

1. Turn the ignition 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) 

NG : INSTALL FRONT SPEED SENSOR CORRECTLY  (See INSPECTION )

Fig 1: Identifying Clearance Between Sensor And Front Steering Knuckle

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to Next Step 

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. 

NG : CLEAN OR REPLACE FRONT SPEED SENSOR 

OK : Go to Next Step 

1. Remove the front axle hub sub-assembly (See ON-VEHICLE INSPECTION ).
2. Check the speed sensor rotor.

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

HINT:

If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.

NG : CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR 

OK : Go to Next Step 

1. Install the front speed sensor and the front speed sensor rotor.
2. Make sure that there is no looseness in the locking part and connecting part of the connectors.
3. Disconnect the skid control ECU connector and the front speed sensor connector.
4. Measure the resistance according to the value(s) in the table below.

Standard Resistance: 

for RH 

for LH 

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Skid Control ECU And Front Speed Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to Next Step 

1. Reconnect the skid control ECU connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

Standard Voltage: 

for RH 

for LH 

Fig 3: Identifying Front Speed Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 ).

NG : REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL )

OK : REPLACE FRONT SPEED SENSOR  (See REMOVAL )