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Home >> Subaru >> 2001 >> Forester Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnostics >> Diagnostic Chart With Trouble Code >> DTC 33: Vehicle Speed Sensor 2 (Front) >> Diagnostic Procedure

Diagnostic Procedure

  1. 8F1: CHECK OPERATION OF SPEEDOMETER. 

    CHECK speedometer operate normally? 

    1. YES:  Even if "AT OIL TEMP" lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair harness or connector in the TCM and transmission.
    2. NO:  Go to step 8F2. 
  2. 8F2: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
    1. Disconnect connector from transmission.
    2. Measure resistance of harness between TCM and transmission connector.

    Connector & Terminal 

    (B55) No. 5 - (B11) No. 17: 

    Fig 1: Measuring Resistance Of Harness Between TCM &Transmission Connector
    G02003502

    CHECK: Is the resistance less than 1 ohm? 

    1. YES:  Go to step 8F3. 
    2. NO:  Repair open circuit in harness between TCM and transmission connector.
  3. 8F3: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 

    Measure resistance of harness between TCM and transmission connector.

    Connector & Terminal 

    (B55) No. 21 - (B11) No. 18: 

    Fig 2: Measuring Resistance Of Harness Between TCM & Transmission Connector
    G02003503

    CHECK: Is the resistance less than 1 ohm? 

    1. YES:  Go to step 8F4. 
    2. NO:  Repair open circuit in harness between TCM and transmission connector, and poor contact in coupling connector,
  4. 8F4: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 

    Measure resistance of harness between TCM and chassis ground.

    Connector & Terminal 

    (B55) No. 21 - Chassis ground: 

    Fig 3: Measuring Resistance Of Harness Between TCM & Chassis Ground
    G02003504

    CHECK: Is the resistance more than 1 Mohm? 

    1. YES:  Go to step 8F5. 
    2. NO:  Repair short circuit in harness between TCM and transmission connector.
  5. 8F5: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 

    Measure resistance of harness between TCM and chassis ground.

    Connector & Terminal 

    (B55) No. 5 - Chassis ground: 

    Fig 4: Measuring Resistance Of Harness Between TCM & Chassis Ground
    G02003505

    CHECK: Is the resistance more than 1 Mohm? 

    1. YES:  Go to step 8F6. 
    2. NO:  Repair short circuit in harness between TCM and transmission connector.
  6. 8F6: CHECK VEHICLE SPEED SENSOR 2. 
    1. Turn ignition switch to OFF.
    2. Disconnect connector from transmission.
    3. Measure resistance between transmission connector receptacle's terminals.

    Connector & Terminal 

    (T4) No. 17 - No. 18: 

    Fig 5: Measuring Resistance Between Transmission Connector Receptacle's Terminals
    G02003506

    CHECK: Is the resistance between 450 and 650 ohm? 

    1. YES:  Go to step 8F7. 
    2. NO:  Replace vehicle speed sensor 2.
      Fig 6: Identifying Vehicle Speed Sensor 2 & Torque Converter Turbine Speed Sensor
      G02003197
  7. 8F7: PREPARE OSCILLOSCOPE. 

    CHECK: Do you have oscilloscope? 

    1. YES:  Go to step  8F10.
    2. NO:  Go to step 8F8. 
  8. 8F8: PREPARE SUBARU SELECT MONITOR. 

    CHECK: Do you have a Subaru Select Monitor? 

    1. YES:  Go to step  8F11.
    2. NO:  Go to step 8F9. 
  9. 8F9: CHECK INPUT SIGNAL FOR TCM. 
    1. Connect all connectors.
    2. Lift-up or raise the vehicle and support with safety stand.
      CAUTION: On AWD models, raise all wheels off ground.
    3. Start the engine and set vehicle in 20 km/h (12 MPH) condition.
      NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. See CLEARING MEMORY-ABS .
    4. Measure voltage between TCM connector terminals.

    Connector & Terminal 

    (B55) No. 5 (+) - No. 21 (-): 

    Fig 7: Measuring Voltage Between TCM Connector Terminals
    G02003507

    CHECK: Is the voltage more than AC 1 V? 

    1. YES:  Go to step  8F12.
    2. NO:  Go to step  8F19.
  10. 8F10: CHECK VEHICLE SPEED SENSOR 2 USING OSCILLOSCOPE. 
    1. Connect all connectors.
    2. Lift-up or raise the vehicle and support with safety stand.
      CAUTION: On AWD models, raise all wheels off ground.
    3. Set oscilloscope to TCM connector terminals.

      Positive probe; (B55) No. 5.

      Earth lead; (B55) No. 21.

      Fig 8: Setting Oscilloscope To TCM Connector Terminals
      G02003508
    4. Start the engine, and drive the wheels slowly.
      NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunctions. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. See CLEARING MEMORY .
    5. Measure signal voltage indicated on oscilloscope.
      Fig 9: Measuring Signal Voltage Indicated On Oscilloscope
      G02003509

    CHECK: Is the voltage more than AC 4 V? 

    1. YES:  Go to step  8F12.
    2. NO:  Go to step  8F19.
  11. 8F11: CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR. 
    1. Connect all connectors.
    2. Connect Subaru Select Monitor to data link connector.
      Fig 10: Identifying Location Data Link Connector (DLC)
      G02003510
    3. Lift-up or raise the vehicle and support with safety stand.
      CAUTION: On AWD models, raise all wheels off ground.
    4. Turn ignition switch to ON and turn Subaru Select Monitor switch to ON.
    5. Start the engine.
    6. Read data of vehicle speed using Subaru Select Monitor.
      • Compare speedometer with Subaru Select Monitor indications.
      • Vehicle speed is indicated in "km/h" or "MPH".
    7. Slowly increase vehicle speed to 60 km/h" or 37 MPH.
    NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. See CLEARING MEMORY .

    CHECK: Does the speedometer indication increase as the Subaru Select Monitor data increases? 

    1. YES:  Go to step 8F12. 
    2. NO:  Go to step  8F19.
  12. 8F12: CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 
    1. Turn ignition switch to OFF.
    2. Disconnect connector from combination meter.
    3. Measure resistance of harness between TCM and combination meter connector.

    Connector & Terminal 

    (B55) No. 13 - (i11) No. 7: 

    Fig 11: Measuring Resistance Of Harness Between TCM & Combination Meter Connector
    G02003511

    CHECK: Is the resistance less than 1 ohm? 

    1. YES:  Go to step 8F13. 
    2. NO:  Repair open circuit in harness between TCM and combination meter connector, and poor contact in coupling connector.
  13. 8F13: CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 

    Measure resistance of harness between combination meter and chassis ground.

    Connector & Terminal 

    (i11) No. 7 - Chassis ground: 

    Fig 12: Measuring Resistance Of Harness Between Combination Meter & Chassis Ground
    G02003512

    CHECK: Is the resistance more than 1 Mohm? 

    1. YES:  Go to step 8F14. 
    2. NO:  Repair short circuit in harness between TCM and combination meter connector.
  14. 8F14: PREPARE OSCILLOSCOPE. 

    CHECK: Do you have oscilloscope? 

    1. YES:  Go to step  8F17.
    2. NO:  Go to step 8F15. 
  15. 8F15: PREPARE SUBARU SELECT MONITOR. 

    CHECK: Do you have a Subaru Select Monitor? 

    1. YES:  Go to step  8F18.
    2. NO:  Go to step 8F16. 
  16. 8F16: CHECK OUTPUT SIGNAL FOR TCM. 
    1. Connect all connectors.
    2. Lift-up or raise the vehicle and support with safety stand.
      CAUTION: On AWD models, raise all wheels off ground.
    3. Set vehicle in 10 km/h (6 MPH) condition.
      NOTE: The speed difference between front and rear wheels may light ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure on on-board diagnostics system. See CLEARING MEMORY .
    4. Measure voltage between TCM connector and chassis ground.

    Connector & Terminal 

    (B55) No. 13 - Chassis ground: 

    Fig 13: Measuring Voltage Between TCM Connector & Chassis Ground
    G02003513

    CHECK: Is the voltage less than 1 V <--> more than 4 V? 

    1. YES:  Even if "AT OIL TEMP" lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair harness or connector in the TCM.
    2. NO:  Go to step  8F19.
  17. 8F17: CHECK INPUT SIGNAL FOR TCM USING OSCILLOSCOPE. 
    1. Connect connectors to combination meter.
    2. Lift-up or raise the vehicle and support with safety stand.
      CAUTION: On AWD models, raise all wheels off ground.
    3. Set oscilloscope to TCM connector terminals.

      Positive probe; (B55) No. 13.

      Earth lead; (B55) No. 21.

      Fig 14: Setting Oscilloscope To TCM Connector Terminals
      G02003514
    4. Start the engine.
    5. Shift on the gear position, and keep the vehicle speed at constant.
    6. Measure signal voltage indicated on oscilloscope.
    NOTE:
    • If vehicle speed increases, the width of amplitude (W) decreases.
    • The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. See CLEARING MEMORY-ABS .
    Fig 15: Measuring Signal Voltage Indicated On Oscilloscope
    G02003515

    CHECK: Is the voltage more than AC 2 V? 

    1. YES:  Even if "AT OIL TEMP" lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair harness or connector in the TCM.
    2. NO:  Go to step  8F19.
  18. 8F18: CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR. 
    1. Connect all connectors.
    2. Lift-up or raise the vehicle and support with safety stand.
      CAUTION: On AWD models, raise all wheels off ground.
    3. Connect Subaru Select Monitor to data link connector.
      Fig 16: Identifying Location Data Link Connector (DLC)
      G02003516
    4. Turn ignition switch to ON and Subaru Select Monitor switch to ON.
    5. Start the engine, and drive all wheels.
    6. Read data of vehicle speed using Subaru Select Monitor.
      • Compare speedometer with Subaru Select Monitor indications.
      • Vehicle speed is indicated in "km/h" or "MPH".
    7. Slowly increase vehicle speed to 60 km/h or 37 MPH.
    NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. See CLEARING MEMORY-ABS .

    CHECK: Does the speedometer indication increase as the Subaru Select Monitor data increases? 

    1. YES:  Even if "AT OIL TEMP" lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair harness or connector in the TCM.
    2. NO:  Go to step 8F19. 
  19. 8F19: CHECK POOR CONTACT. 

    CHECK: Is there poor contact in vehicle speed sensor 2 circuit? 

    1. YES:  Repair poor contact.
    2. NO:  Replace TCM, see TRANSMISSION CONTROL MODULE (TCM) .
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