AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0500

DTC Code DTC Name
P0500 Vehicle Speed Sensor "A"

DESCRIPTION

The speed sensors detect the wheel speed and send the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the TCM via the combination meter. The TCM determines the vehicle speed based on the frequency of these pulse signals.

A01W4A0E70
*a 4-Pulse
*b from Speed Sensor
*c Skid Control ECU
*d Combination Meter
DTC No. DTC Detection Condition Trouble Area
P0500 When the ECT sensor is normal and the counter gear speed is 300 rpm or more, the vehicle speed signal is not input for 2 seconds or more.

  • Open or short in vehicle speed signal circuit

  • Combination meter

  • Vehicle speed sensor (Brake control system)

  • Skid control ECU (Brake control system)

  • TCM

MONITOR DESCRIPTION

The TCM assumes that the vehicle is being driven when the transmission counter gear indicates more than 300 rpm and over 30 seconds have passed since the park/neutral position switch assembly was turned off. If there is no vehicle speed signal with these conditions satisfied, the TCM concludes that there is a vehicle speed signal malfunction. The TCM will turn on the MIL and a DTC will be set.

WIRING DIAGRAM

Click here

When a DTC P0500 is output, a ground short in the wiring of terminal SPD or an internal ground short in the relevant ECU is suspected.

PROCEDURE


  1. READ VALUE USING GTS (VEHICLE SPEED)


    1. Drive the vehicle and check whether the operation of the speedometer in the combination meter assembly is normal.

      Tech Tips


      • The vehicle speed sensor is operating normally if the speedometer reading is normal.

      • If the speedometer does not operate, check it by following the procedure described for a speedometer malfunction.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / ECT / Data List / Vehicle Speed.

    6. Drive the vehicle.

    7. Read the value displayed on the GTS.

      OK
      Vehicle speeds displayed on tester and speedometer display are equal.

    OK

    SYMPTOM SIMULATION AND DTC CHECK Click here

    NG

  2. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)


    1. A01W0ZVE01
      Text in Illustration
      *a

      Component with harness connected

      (Combination Meter Assembly)

      Inspect the combination meter assembly using an oscilloscope.


      1. Move the shift lever to N.

      2. Jack up the vehicle.

      3. Turn the engine switch on (IG).

      4. Measure the voltage between the terminal of the combination meter assembly and the body ground while the wheel is turned slowly.

        Standard Voltage
        Tester Connection Condition Specified Condition
        H14-19 (+S) - Body ground Engine switch ON Voltage generated intermittently

        Tech Tips

        The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.

        As the vehicle speed increases, the width indicated by (A) in the illustration narrows.


    NG

    GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TCM)


    1. Disconnect the H14 combination meter assembly connector.

    2. Disconnect the A22 TCM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      H14-19 (+S) - A22-10 (SPD) Always Below 1 Ω

    4. Reconnect the H14 combination meter assembly connector.

    5. Reconnect the A22 TCM connector.


    OK

    REPLACE TCM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ASSEMBLY - TCM)