AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P050031

DTC Code DTC Name
P050031 Vehicle Speed Sensor "A" No Signal

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 ECM via the combination meter assembly. The ECM determines the vehicle speed based on the frequency of this pulse signal.

A01VW8VE02
*a 4-Pulse
*b from Speed Sensor
*c Skid Control ECU
*d Combination Meter Assembly
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P050031 Vehicle Speed Sensor "A" No Signal

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. Vehicle is being driven

  2. Vehicle speed signal is not input

  3. 2 seconds

  4. 1-trip detection logic

  • Open or short in vehicle speed signal circuit

  • Combination meter assembly

  • Skid control ECU (Brake control system)

  • ECM

 Comes on DTC stored

SAE Code:

P0500

MONITOR DESCRIPTION

The ECM 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 the vehicle speed signal is not input with these conditions satisfied, the ECM concludes that there is a vehicle speed signal malfunction, illuminates the MIL and stores this DTC.

WIRING DIAGRAM

When DTC P050031 is output, a short to ground in the wire harness connected to terminal SPD or an internal short to ground in the relevant ECU is suspected.

Refer to Speed Signal Circuit.

Click here

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

Click here

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the engine switch on (IG) and wait for 3 seconds or more.

  2. Perform the D Position Shift Test inspection in Road Test.

    Click here

  3. Check for DTCs again.

    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 diagnostic procedure for a malfunction of the speedometer.

    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 / Transmission / Data List / Vehicle Speed.


      Powertrain > Transmission > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Vehicle Speed Vehicle speed

      Min.: 0 km/h (0 MPH)

      Max.: 255 km/h (158 mph)

      		 Actual vehicle speed

      • This is the current vehicle speed.

      • The vehicle speed is detected using the wheel speed sensors.


        • Vehicle speed data is delayed when it is displayed. Therefore, even if the vehicle speed listed in the freeze frame data is 0 km/h (0 mph), this does not always mean that the malfunction occurred when the vehicle was stopped.

      Powertrain > Transmission > Data List
      Tester Display
      Vehicle Speed

    6. Drive the vehicle.

    7. According to the display on the GTS, read the Data List.

      OK
      Vehicle speeds displayed on the GTS and speedometer are equal.
      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK COMBINATION METER SYSTEM


    1. Check the circuits that send vehicle speed signals to this system in Combination Meter System.

      Click here

    2. During the above inspection, if there is a step that indicates to troubleshoot another system, proceed to the next step.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Disconnect the J10 combination meter assembly connector.

    2. Disconnect the A46 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J10-19 (+S) - A46-44 (SPD) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR