Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

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

Check output value of speed sensor.
PREPARATION:
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main switch ON.
3. Select the DATALIST mode on the hand-held tester.
  CHECK:
  
  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.
  
  OK:
  
  There is almost no difference from the displayed speed value.
  
  HINT:
  
  There is tolerance of +/- 10% in the speedometer indication.
1. OK: Go to step 4 .
2. NG: Go to next step.
Check speed sensor.
Front:

PREPARATION:
1. Make sure that there is no looseness at the connector's locking part and connecting part of the connector.
2. Disconnect the speed sensor connector.
CHECK:
- LH side:
  Measure resistance between terminals 2 and 4 of the speed sensor connector.
- RH side:
Measure resistance between terminals 1 and 2 of the speed sensor connector.

OK:

Resistance: 0.92 to 1.22 kΩ

CHECK:
- LH side:
  Measure resistance between terminals 2 and 4 of the speed sensor connector and body ground.
- RH side:
  Measure resistance between terminals 1 and 2 of the speed sensor connector and body ground.
  
  Fig 1: Measuring Resistance Between Terminals Of Speed Sensor Connector & Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK:

Resistance: 1 MΩ or higher

Rear:

PREPARATION:
1. Make sure that there is no looseness at the connector's locking part and connecting part of the connector.
2. Disconnect the speed sensor connector.
  CHECK:
  
  Measure resistance between terminals 1 and 2 of the speed sensor connector.
  
  OK:
  
  Resistance: 1.0 to 1.4 kΩ
  
  CHECK:
  
  Measure resistance between terminal 1 or 2 of the speed sensor connector and body ground.
  
  OK:
  
  Resistance: 1 MΩ or higher
  
  Fig 2: Measuring Resistance Between Terminals 1 & 2 Of Speed Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace speed sensor.
2. OK: Go to next step.
Check for open and short circuit in harness and connector between each speed sensor and ECU (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
Check sensor installation.
CHECK:

Check the speed sensor installation.

OK:

The installation bolt is tightened properly and there is no clearance between the sensor and front steering knuckle or rear axle carrier.

Torque: 8.0 N.m (82 kgf.cm, 71 in.lbf)

Fig 3: Identifying Correct Installation Method Of Speed Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace speed sensor.
2. OK: Go to next step.
Check speed sensor and sensor rotor serrations.
(REFERENCE) INSPECTION USING OSCILLOSCOPE

PREPARATION:
1. Remove the skid control ECU with connectors still connected.
2. Connect the oscilloscope to each of terminals FR+ - FR-, FL+ - FL-, RR+ - RR- or RL+ - RL- of the skid control ECU.
CHECK:

Drive the vehicle at about 12 mph (20 km/h), and check the signal waveform.

HINT:
- As vehicle speed (rpm of the wheels) increase, 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 deposited on it.
  
  Fig 4: Signal Waveform Graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Check and replace skid control ECU.
2. NG: Go to next step.
Check sensor rotor and sensor tip.
Front:

PREPARATION:

Remove the front axle hub (See REMOVAL ).

CHECK:

Check the sensor rotor serrations.

OK:

No scratches, missing teeth or foreign matter.

PREPARATION:

Remove the front speed sensor (See REMOVAL ).

CHECK:

Check the sensor tip.

OK:

No scratches or foreign matter on the sensor tip.

HINT:

If foreign matter (including that on the sensor rotor side) is identified, remove it and after reassembling, check the output wareform.

Rear:

PREPARATION:

Remove the rear axle shaft (See REMOVAL ).

Fig 5: Identifying Sensor Rotor Serrations (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK:

Check the sensor rotor serrations.

OK:

No scratches, missing teeth or foreign matter.

PREPARATION:

Remove the rear speed sensor (See REMOVAL ).

CHECK:

Check the sensor tip.

OK:

No scratches or foreign matter on the sensor tip.

HINT:

If foreign matter (including that on the sensor rotor side) is identified, remove it and after reassembling, check the output wareform.

Fig 6: Identifying Sensor Rotor Serrations (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace speed sensor or rotor.
  NOTE: Check the speed sensor signal last (See PRE-CHECK ).
2. OK: Check and replace skid control ECU.