Inspection Procedure

1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (See CHECK FOR INTERMITTENT PROBLEMS ).

   ABS/VSC/TRAC: 

   MEASUREMENT ITEM NORMAL CONDITION CHART
   
   

   Item	Measurement Item / Range (Display)	Normal Condition
   RR SPD OPN	RR speed sensor open detection / NORMAL or ERROR	NORMAL: Normal condition
   RL SPD OPN	RL speed sensor open detection / NORMAL or ERROR	NORMAL: Normal condition

   OK: There are no momentary interruption. 

   HINT:

   Perform the above inspection before removing the sensor and connector.

NG: GO TO step   10 

OK: Go to next step 

1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch on.
3. Select the DATA LIST mode on the intelligent tester.

   ABS/VSC/TRAC: 

   MEASUREMENT ITEM NORMAL CONDITION CHART
   
   

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

4. Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle.

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

   HINT:

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

   OK: GO TO step   8 

NG: Go to next step 

1. Check the sensor installation.

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

   4WD: 

   Torque: 

   8.0 N*m (82 kgf*cm, 71 in.*lbf) 

   NOTE: Check the speed sensor signal after the replacement (See TEST MODE PROCEDURE ).

NG: REPLACE REAR SPEED SENSOR 

Fig 1: Identifying Clearance Between Sensor And Rear Axle Carrier

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Go to next step 

1. 2WD:
   1. Disconnect the speed sensor rear connector.
   2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      1 - 2	Below 2.2 kΩ

   3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Measuring Resistance Between Rear Speed Sensor Connector Terminal - 2WD

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   1 - Body ground	1 MΩ or higher
   2 - Body ground

2. 4WD:
   1. Remove the seat cushion and seatback.
   2. Disconnect the speed sensor connector.
   3. Measure the resistance according to the value(s) in the table below.

      Resistance (at 25 +- 5°C) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      1 (RL+) - 2 (RL-)	0.9 to 1.3 kΩ
      1 (RR+) - 2 (RR-)

      Fig 3: Measuring Resistance Between Rear Speed Sensor Connector Terminal - 4WD

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   4. Measure the resistance according to the value(s) in the table below.

   Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   1 (RL+) - Body ground	1 MΩ or higher
   2 (RL-) - Body ground
   1 (RR+) - Body ground
   2 (RR-) - Body ground

   NOTE: Check the speed sensor signal after the replacement (See TEST MODE PROCEDURE ).

NG: REPLACE REAR SPEED SENSOR 

OK: Go to next step 

1. Disconnect the skid control ECU connectors and rear speed sensor connectors.
2. Measure the resistance according to the value(s) in the table below.

   Resistance: 

   LH (2WD) 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S25-2 (RL+) - S39-35 (RL+)	Below 1 Ω
   S25-1 (RL-) - S39-27 (RL-)	Below 1 Ω

   RH (2WD) 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S26-2 (RR+) - S40-31 (RR+)	Below 1 Ω
   S26-1 (RR-) - S40-23 (RR-)	Below 1 Ω

   LH (4WD) 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S25-2 (RL-) - S39-27 (RL-)	Below 1 Ω
   S25-1 (RL+) - S39-35 (RL+)	Below 1 Ω

   RH (4WD) 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S26-2 (RR-) - S40-23 (RR-)	Below 1 Ω
   S26-1 (RR+) - S40-31 (RR+)	Below 1 Ω

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

Fig 4: Identifying Skid Control ECU Connectors And Rear Speed Sensor Connectors

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Resistance: 

LH (2WD) 

RH (2WD) 

LH (4WD) 

RH (4WD) 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Connect the skid control ECU connector.
2. Connect the oscilloscope to terminals S40-31 (RR+) and S40-23 (RR-) or S39-35 (RL+) and S39-27 (RL-) of the skid control ECU.
3. Drive the vehicle at approximately 19 mph (30 km/h), and check the signal waveform.

   OK: A waveform as shown in the figure should be output. 

   HINT:

   • 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.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 5: Identifying Skid Control ECU Connector With Signal Waveform Graph

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Go to next step 

1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch on.
3. Select the DATA LIST mode on the intelligent tester.

   ABS/VSC/TRAC: 

   MEASUREMENT ITEM NORMAL CONDITION CHART
   
   

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

4. Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle.

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

   HINT:

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

NG: REPLACE SKID CONTROL ECU 

OK: END 

1. Perform sensor signal check in TEST MODE PROCEDURE (See TEST MODE PROCEDURE ).

   OK: All test mode DTCs are erased. 

NG: GO TO step   3 

OK: Go to next step 

1. Connect the oscilloscope to terminals S40-31 (RR+) and S40-23 (RR-) or S39-35 (RL+) and S39-27 (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 the figure should be output. 

   HINT:

   • 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.

NG: CLEAN OR REPLACE REAR SPEED SENSOR AND SENSOR ROTOR 

Fig 6: Identifying Skid Control ECU Connector With Signal Waveform Graph

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: END 

1. Clear the DTC (See DTC CHECK / CLEAR ).
2. Turn the ignition switch on.
3. Drive the vehicle at the speed of 32 km/h (20 mph) or more, for 60 seconds or more, and drive in reverse at a speed of 3 km/h (2 mph) or more, for approximately 5 seconds.
4. Check that the same DTC is recorded (See DTC CHECK / CLEAR ).

   HINT:

   Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result 

B: GO TO step   2 

A: END