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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 367 (Anti-Lock Brake System - Diagnostics) >> Circuit Inspection >> DTC C0200/31-C0215/34 Speed Sensor Circuit, DTC C1235/35-C1239/39 Speed Sensor Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 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.
  1. 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. 

    NOTE: There is tolerance of +/- 10 % in the speedometer indication.
    1. OK: Go to step   4 . 
    2. NG: Go to next step. 
  2. Check speed sensor. 

    Front: 

    Preparation: 

    1. Remove the front fender liner.
    2. Make sure that there is no looseness at the connector lock part and connecting part of the connector.
    3. Disconnect the speed sensor connector.

    CHECK: 

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

    OK  :

    Resistance: 0.9 - 1.8 kΩ at 20°C (68 °F)  .

    CHECK: 

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

    Fig 1: Determining Speed Sensor Circuit Resistance (Front)
    G01081456Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK  :

    Resistance: 1 MΩ or higher  .

    Rear: 

    Preparation: 

    1. Make sure that there is no looseness at the connector lock part and connecting part of the connector or rear under floor.
    2. Disconnect the speed sensor connector.

    CHECK: 

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

    Fig 2: Determining Speed Sensor Circuit Resistance (Rear)
    G01081457Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK  :

    Resistance: 0.9 - 1.3 kΩ at 20 °C (68 °F)  .

    CHECK: 

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

    OK  :

    Resistance: 1 MΩ or higher  .

    1. NG: Replace front speed sensor or rear axle hub or rear skid control wire. 
      NOTE: Check the speed sensor signal last. See  2.
    2. OK 
  3. Check for open and short circuit in harness and connector between each speed sensor and ECU. See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  . 
    1. NG: Repair or replace harness or connector  .
    2. OK: Go to next step. 
  4. Check front speed sensor installation. 

    CHECK: 

    Check the speed sensor installation.

    Fig 3: Identifying Possible Cause Of Speed Sensor Malfunction
    G01081458Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK  :

    The installation bolt is tightened properly and there Is no clearance between the sensor and knuckle. Torque: 8.0 N.m (82 kgf.cm, 71 in.lbf)  .

    1. NG: Reinstall or replace front speed sensor. 
      NOTE: Check the speed sensor signal last. See  2.
    2. OK: Go to next step. 
    5. NOTE:
    • As the vehicle speed (RPM of the wheels) increases, a cycle of the waveform becomes shorter 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: Identifying Normal Signal Waveform
    G01081459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Check rear speed sensor and sensor rotor serrations. 

    Reference: inspection using oscilloscope  .

    Preparation: 

    Connect the oscilloscope to the each of terminals RR+ - RR- or RL+ - RL- of the ECU harness side connector.

    CHECK: 

    Drive the vehicle at about 30 km/h (19 mph), and check the signal waveform.

    1. NG: Replace rear axle hub. 
    2. OK: Go to next step. 
    6. NOTE:
    • As the vehicle speed (RPM of the wheels) increases, a cycle of the waveform becomes shorter 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 5: Identifying Normal Signal Waveform
    G01081460Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Check front speed sensor and sensor rotor serrations. 

    Reference: inspection using oscilloscope 

    Preparation: 

    Connect the oscilloscope to the each of terminals FR+ - FR- or FL+ - FL- of the ECU harness side connector.

    CHECK: 

    Drive the vehicle at about 30 km/h (19 mph), and check the signal waveform.

    1. OK: Check and replace ABS actuator assembly. 
    2. NG: Go to next step. 
  7. Check front sensor rotor and sensor tip. 

    Preparation: 

    Remove the front drive shaft. See SIENNA .

    CHECK: 

    Check the sensor rotor serrations.

    Fig 6: Inspecting Front Sensor Rotor Serrations
    G01081461Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    No scratches, missing teeth or foreign objects. 

    Preparation: 

    Remove the front speed sensor. See REMOVAL .

    CHECK: 

    Check the sensor tip.

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

    OK: 

    No scratches or foreign objects on the sensor tip. 

    1. NG Replace sensor rotor or speed sensor. 
      NOTE: Check the speed sensor signal last. See  2.
    2. OK 

    Check and replace ABS actuator assembly. 

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