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.

B00889HE21
*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 While the vehicle is being driven, the vehicle speed signal is not input for 2 seconds (1-trip detection logic).

  • Wire harness or connector

  • Open or short in vehicle speed signal circuit

  • Combination meter assembly

  • Vehicle speed sensor (Brake control system)

  • 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 330 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.

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Tech Tips

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the engine switch off and wait for 2 minutes or more.

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Start the engine.

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

    Click here

  8. Stop the vehicle.

  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

  10. Input the DTC: P050031.

  11. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

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.

Click here

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. READ VALUE USING GTS (VEHICLE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. 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.


        • There is a delay in when the vehicle speed data 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

    5. Drive the vehicle.

    6. Read the value displayed on the GTS.

      Result
      Result Proceed to
      Values displayed on GTS and speedometer display are not equal A
      Values displayed on GTS and speedometer display are equal B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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


    1. Disconnect the K21 combination meter assembly connector.

    2. Disconnect the A78 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-6 (+S) - A78-44 (SPD) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK COMBINATION METER SYSTEM


    1. Check the circuits that send vehicle speed signals to this system in the combination meter system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Transmission > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Start the engine.

    7. Turn the GTS on.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Transmission / Trouble Codes.

    10. Read the DTCs.


      Powertrain > Transmission > Trouble Codes

      Tech Tips

      If no DTCs (no pending DTCs) are output, the repair has been successfully completed.

      Result
      Proceed to
      NEXT

    NEXT

    END