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. The ECM determines the vehicle speed based on the frequency of these pulse signals.

B0057P8E02
*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 When the engine coolant temperature sensor is normal and the counter gear speed is 300 rpm or more, the vehicle speed signal is not input for 2 sec. or more (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: 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 there is no vehicle speed signal with these conditions satisfied, the ECM concludes that there is a vehicle speed signal malfunction. The ECM will illuminate the MIL and store this DTC.

WIRING DIAGRAM

B005AFDE06
*1 Combination Meter Assembly
*2 from Skid Control ECU

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. 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 / Transmission / Data List / Vehicle Speed.


      Powertrain > Transmission > Data List
      Tester Display
      Vehicle Speed

    6. Drive the vehicle.

    7. Read the value displayed on the GTS.

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

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK COMBINATION METER SYSTEM


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

      Click here

    2. During inspection for the meter section, if there is an instruction that indicates to go back to inspections for each system, proceed to the next step.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Disconnect the I10 combination meter assembly connector.

    2. Disconnect the A35 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I10-19 (+S) - A35-44 (SPD) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR