Inspection Procedure

HINT:

Start the inspection from step 1 when using the hand-held tester and start from step 2 when not using the hand-held tester.

READ VALUE OF HAND-HELD TESTER (REAR SPEED SENSOR)

Connect the hand-held tester to the DLC3.
Start the engine.

Select the DATA LIST mode on the hand-held tester.

DATA LIST

Item	Measurement Item / Range (Display)	Normal Condition
WHEEL SPD RR	Wheel speed sensor (RR) reading / min.: 0 km/h (0 MPH, max.: 326 km/h (202 MPH)	Actual wheel speed
WHEEL SPD RL	Wheel speed sensor (RL) reading / min.: 0 km/h (0 MPH, max.: 326 km/h (202 MPH)	Actual wheel speed

Check that there is no difference between the speed value output from the speed sensor displayed on the hand-held tester and the speed value displayed on the speedometer when driving the vehicle.
Standard:

There is almost no difference in the displayed speed value.

HINT:

There is tolerance of +/- 10 % in the speedometer indication.

OK: Go to step 4

NG: Go to Next Step.

INSPECT REAR SPEED SENSOR

Disconnect the rear speed sensor connector.

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

Standard:

TESTER CONNECTION SPECIFIED CONDITION (1 OF 2)

Tester Connection	Specified Condition
1 -2	1.3 to 1.6 kΩ at 20 °C

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

Standard:

TESTER CONNECTION SPECIFIED CONDITION (2 OF 2)

Tester Connection	Specified Condition
1 - Body ground	10 kΩ or higher
2 - Body ground	10 kΩ or higher

Fig 1: Measuring Rear Speed Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Skid control sensor sub-wire harness:

Remove the seat cushion and seatback.
Make sure that there is no looseness at the connector's locking part and connecting part of the connector.

Measure the resistance between terminal 1 and 2 of connector A and terminal 1 and 2 of connector B.

Fig 2: Measuring Resistance Between Terminal 1 And 2 Of Connector A And Terminal 1 And 2 Of Connector B

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

LH:

TESTER CONNECTION SPECIFIED CONDITION LH (1 OF 4)

Tester Connection	Specified Condition
(A32) 1 - 1	1.0 $ or less
(A32) 2-2	1.0 $ or less
(A32) 1 - (A32) 2	10 kΩ or higher

RH:

TESTER CONNECTION SPECIFIED CONDITION RH (1 OF 4)

Tester Connection	Specified Condition
(A33) 1 -1	1.0 Ω or less
(A33) 2 -2	1.0 Ω or less
(A33) 1 - (A33)2	10 kΩ or higher

Measure the resistance between terminals 1 and 2 of speed sensor connector 1 and body ground.

Standard:

LH:

TESTER CONNECTION SPECIFIED CONDITION LH (2 OF 4)

Tester Connection	Specified Condition
(A32) 1 - Body ground	10 kΩ or higher
(A32) 2 - Body ground	10 kΩ or higher

RH:

TESTER CONNECTION SPECIFIED CONDITION RH (2 OF 4)

Tester Connection	Specified Condition
(A33) 1 - Body ground	10 kΩ or higher
(A33) 2 - Body ground	10 kΩ or higher

NOTE: Check the speed sensor signal after replacement (See PRE-CHECK ).

NG: REPLACE REAR SPEED SENSOR OR SUB-WIRE HARNESS

OK: Go to Next Step.

CHECK HARNESS AND CONNECTOR (REAR SPEED SENSOR - SKID CONTROL ECU)

Disconnect the skid control ECU connector and the rear speed sensor connector.

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

Standard:

LH:

TESTER CONNECTION SPECIFIED CONDITION LH (3 OF 4)

Tester Connection	Specified Condition
A32-1 (RL+)-S1-7(RL+)	Below 1 Ω
A32-2(RL-)-S1-17(RL-)	Below 1 Ω

RH:

TESTER CONNECTION SPECIFIED CONDITION RH (3 OF 4)

Tester Connection	Specified Condition
A33-1 (RR+)-S1-19(RR+)	Below 1 Ω
A33-2(RR-)-S1-8(RR-)	Below 1 Ω

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

Fig 3: Checking Harness And Connector (Rear Speed Sensor - Skid Control ECU)

Standard:

LH:

TESTER CONNECTION SPECIFIED CONDITION LH (4 OF 4)

Tester Connection	Specified Condition
A32-1 (RL+) - Body ground	10 kΩ or higher
A32-2 (RL-) - Body ground	10 kΩ or higher

RH:

TESTER CONNECTION SPECIFIED CONDITION RH (4 OF 4)

Tester Connection	Specified Condition
A33-1 (RR+) - Body ground	10 kΩ or higher
A33-2 (RR-) - Body ground	10 kΩ or higher

NOTE: Check the speed sensor signal after replacement (See PRE-CHECK ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step.

INSPECT SENSOR AND SENSOR ROTOR SERRATIONS
INSPECTION USING OSCILLOSCOPE
1. Connect the oscilloscope to terminals RR+ - RR- or RL+ - RL- of the skid control ECU.
2. Drive the vehicle at about 19 mph (30 km/h), and check the signal waveform.
  Standard:
  - As vehicle speed (wheel revolution speed) increases, a cycle 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 the speed sensor rotor's scratches, looseness or foreign matter attached to it.
    
    Fig 4: Normal Signal Waveform
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE BRAKE ACTUATOR ASSY (See REPLACEMENT )
1. NG: Go to Next Step.
INSPECT REAR SPEED SENSOR INSTALLATION
1. Check the rear speed sensor installation.
  Standard:
  
  There is no clearance between the sensor and rear axle carrier.
  
  NOTE: Check the speed sensor signal after replacement (See PRE-CHECK ).
  
  Fig 5: Inspecting Rear Speed Sensor Installation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE REAR SPEED SENSOR (See REPLACEMENT )
OK: Go to Next Step.
INSPECT SPEED SENSOR TIP
1. Remove the skid control sensor (See REPLACEMENT ).
2. Check the sensor tip.
  Standard:
  
  No scratches or foreign matter on the sensor tip.
NOTE: Check the speed sensor signal after replacement (See PRE-CHECK ).
1. NG: REPLACE REAR SPEED SENSOR (See REPLACEMENT )
OK: Go to Next Step.
INSPECT SENSOR ROTOR
1. Check the sensor rotor serrations.
  Standard:
  
  No scratches, missing teeth or foreign matter.
  
  NOTE: Check the speed sensor signal after replacement (See PRE-CHECK ).
  
  Fig 6: Checking Sensor Rotor Serrations
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE REAR AXLE HUB & BEARING ASSY (See REPLACEMENT )
OK: REPLACE BRAKE ACTUATOR ASSY (See REPLACEMENT )