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.

A018HOSE01
*a 4-Pulse
*b Skid Control ECU
*c from Speed Sensor
*d Combination Meter
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0500 Vehicle Speed Sensor "A" 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

 Comes on DTC stored

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 illuminate the MIL and store this DTC.

WIRING DIAGRAM

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.

Click here

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 ignition switch to ON.

    4. Turn the GTS on.

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


      Powertrain > ECT > Data List
      Tester Display
      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.
      Result
      Proceed to
      OK
      NG

    OK

    SYMPTOM SIMULATION AND DTC CHECK Click here

    NG

  2. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)


    1. Inspect the combination meter assembly using an oscilloscope.

      A018J6ZC03
      *a

      Component with harness connected

      (Combination Meter Assembly)

      		 - -

      1. Move the shift lever to N.

      2. Jack up the vehicle.

      3. Turn the ignition switch to ON.

      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
        F22-3 (+S) - Body ground Ignition 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.

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

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


    1. Disconnect the combination meter assembly connector.

    2. Disconnect the 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
      F22-3 (+S) - C3-3 (SPD) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TCM Click here

    NG

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