SFI SYSTEM, Diagnostic DTC:P050031

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

DESCRIPTION

Vehicles, which are equipped with ABS (Anti-lock Brake System), detect the vehicle speed using the brake actuator assembly (skid control ECU) and wheel speed sensor. The wheel speed sensor monitors the wheel rotation speed and sends a signal to the brake actuator assembly (skid control ECU). The brake actuator assembly (skid control ECU) converts the wheel speed signal into a 4-pulse signal and transmits it to the ECM via the combination meter assembly. The ECM determines the vehicle speed based on the frequency of the pulse signal.

Tech Tips


  • Various systems use the vehicle speed signal distributed from the combination meter assembly. Check all the components possibly related to speed signal.

  • A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly.

    The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective system based on the pulse signal.

  • If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems using the speed signal will not operate normally.

A005QEIE13
*a 4-Pulse
*b from Wheel Speed Sensor
*c Brake Actuator Assembly (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 vehicle being driven, no vehicle speed sensor signal transmitted to ECM (2 trip detection logic).

  • Open or short in speed signal circuit

  • Combination meter assembly

  • Brake actuator assembly (Skid control ECU)

  • ECM

 Comes on DTC stored

SAE Code:

P0500

MONITOR DESCRIPTION



MONITOR STRATEGY

Required Sensors/Components (Main)

Vehicle speed sensor

Combination meter assembly

Brake actuator assembly (Skid control ECU)
Required Sensors/Components (Related)

Park/Neutral position switch*

Engine coolant temperature sensor

Crankshaft position sensor

Throttle position sensor

Mass air flow meter
Frequency of Operation Continuous

TYPICAL ENABLING CONDITIONS

for CVT
Engine Running
for Manual Transaxle
Fuel cut On

TYPICAL MALFUNCTION THRESHOLDS

Vehicle speed sensor signal No signal

CONFIRMATION DRIVING PATTERN


A005PLLE36

  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON.

  3. Turn the GTS on.

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

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

  6. Turn the ignition switch to ON.

  7. Turn the GTS on [A].

  8. Start the engine.

  9. Drive the vehicle at 24 km/h (15 mph) or more for a total of 30 seconds or more [B].

    CAUTION:

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

  10. Stop the vehicle.

  11. Enter the following menus: Powertrain / Engine / Trouble Codes [C].

  12. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  14. Input the DTC: P050031.

  15. 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.


A005PGCE35

  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON.

  3. Turn the GTS on.

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

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

  6. Start the engine.

  7. Turn the GTS on [A].

  8. Drive the vehicle at 24 km/h (15 mph) or more for a total of 30 seconds or more [B].

    CAUTION:

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

  9. Decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel cut [C].

  10. Stop the vehicle.

  11. Enter the following menus: Powertrain / Engine / Trouble Codes [D].

  12. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  14. Input the DTC: P050031.

  15. 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

A005P92E11
*a from Brake Actuator Assembly (Skid Control ECU)
*b Combination Meter Assembly
*c to Other ECUs

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING GTS (VEHICLE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / All Data / Vehicle Speed.


      Powertrain > Engine > 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 not equal A
      Values displayed on GTS and speedometer display equal B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. CHECK COMBINATION METER SYSTEM (SPEED SIGNAL CIRCUIT)


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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition 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 / Engine / Trouble Codes.


      Powertrain > Engine > Trouble Codes

      Tech Tips

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

      Result
      Proceed to
      NEXT

    NEXT

    END