Inspection Procedure

HINT:

Start the inspection from step 1 when using the hand-held tester and start from step 3 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.

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

MEASUREMENT ITEM / RANGE (DISPLAY) CHART

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

OK: There is almost no difference in the displayed speed value.

HINT:

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

NG: Go to step NO TAG
OK: GO TO NEXT STEP.

INSPECT SPEED 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 approximately 19 mph (30 km/h), and check the signal waveform.
  OK: A waveform as shown in a figure should be output.
  
  HINT:
  - As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the fluctuation in the output voltage becomes greater.
    
    Fig 1: Inspecting Oscilloscope
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - 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.
1. NG: Go to step NO TAG
2. OK: REPLACE REAR SPEED SENSOR (See REPLACEMENT )

INSPECT REAR SPEED SENSOR

2WD:

Disconnect the skid control sensor connector.

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

Standard:

SPECIFICATION TESTER CONNECTION

Tester Connection	Specified Condition
1 - 2	0.9 to 2.1 kΩ

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

Fig 2: Inspecting Rear Speed Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

SPECIFICATION TESTER CONNECTION

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

2WD:

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 of connector A and terminal 2 of connector B.

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

Standard:

Fig 3: Removing Seat Cushion And Seatback

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SPECIFICATION TESTER CONNECTION

Tester Connection	Specified Condition
A-1 - B-1	1 Ω or less
A-2 - B-2	1 Ω or less

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

Standard:

SPECIFICATION TESTER CONNECTION

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

4WD:

Disconnect the rear speed sensor connector.

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

Standard:

SPECIFICATION TESTER CONNECTION

Tester Connection	Specified Condition
1 - 2	0.9 to 1.3 kΩ at 25°C

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

Standard:

Fig 4: Disconnecting Rear Speed Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SPECIFICATION TESTER CONNECTION

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

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

NG: REPLACE REAR SPEED SENSOR (See REPLACEMENT )
OK: GO TO NEXT STEP.

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

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

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

Standard:

LH:

SPECIFICATION TESTER CONNECTION

Tester Connection	Specified Condition
S27-20 (RL+) - A24-1 (RL+)	Below 1 Ω
S27-6 (RL-) - A24-2 (RL-)	Below 1 Ω

RH:

SPECIFICATION TESTER CONNECTION

Tester Connection	Specified Condition
S27-5 (RR+) - A25-1 (RR+)	Below 1 Ω
S27-19 (RR-) - A25-2 (RR-)	Below 1 Ω

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

Standard:

Fig 5: Disconnecting Skid Control ECU Connector And Skid Control Sensor Connector

LH:

SPECIFICATION TESTER CONNECTION

Tester Connection	Specified Condition
S27-20 (RL+) - Body ground	10 kΩ or higher
S27-6 (RL-) - Body ground	10 kΩ or higher

RH:

SPECIFICATION TESTER CONNECTION

Tester Connection	Specified Condition
S27-5 (RR+) - Body ground	10 kΩ or higher
S27-19 (RR-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: GO TO NEXT STEP.

INSPECT SPEED 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 approximately 19 mph (30 km/h), and check the signal waveform.
  OK: A waveform as shown in a figure should be output.
  
  HINT:
  - As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the fluctuation in the output voltage becomes greater.
    
    Fig 6: Inspecting Oscilloscope
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - 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.
1. NG: Go to step NO TAG
2. OK: REPLACE REAR SPEED SENSOR (See REPLACEMENT OR REPLACEMENT )
INSPECT REAR SPEED SENSOR INSTALLATION
2WD:
1. Check the sensor installation.
  OK: There is no clearance between the sensor and rear axle carrier.
  
  Fig 7: Inspecting Rear Speed Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4WD:
1. Check the speed sensor installation.
  OK: There is no clearance between the sensor and rear axle carrier.
  
  The installation bolt is tightened properly.
  
  Torque: 8.0 N.m (82 kgf.cm, 71 in.lbf)
  
  NOTE: Check the speed sensor signal after replacement (see PRE-CHECK ).
  
  Fig 8: Checking Speed Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE REAR SPEED SENSOR (See REPLACEMENT OR REPLACEMENT )
2. OK: GO TO NEXT STEP.
INSPECT SPEED SENSOR ROTOR AND SENSOR TIP
2WD:
1. Remove the skid control sensor (see REPLACEMENT ).
2. Check the sensor tip.
  OK: No scratches or foreign matter on the sensor tip.
4WD:
1. Remove the rear speed sensor (See REPLACEMENT ).
2. Check the sensor tip.
  OK: No scratches or foreign matter on the sensor tip.
2WD:
1. Check the sensor rotor serrations.
  OK: No scratches, missing teeth or foreign matter on the rotor.
  
  Fig 9: Removing Skid Control Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4WD:
1. Remove the rear drive shaft (See REMOVAL & INSTALLATION ).
2. Check the sensor rotor serrations.
  OK: No scratches, missing teeth or foreign matter.
  
  HINT:
  
  If foreign matter is attached, remove it and after reassembling, check the output waveform.
  
  NOTE: Check the speed sensor signal after the replacement (see PRE-CHECK ).
  
  Fig 10: Identifying Pre-Check
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: CLEAN OR REPLACE SPEED SENSOR AND SENSOR ROTOR SERRATIONS
2. OK: REPLACE ABS & TRACTION ACTUATOR ASSY (See REPLACEMENT )