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AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P050031

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

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of this pulse signal.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P050031 Vehicle Speed Sensor "A" No Signal

All of the following conditions are met (1-trip detection logic):


  • Park/neutral position switch D input signal is ON.

  • The counter gear speed is 300 rpm or more.

  • Any of the following conditions are met:


    1. Vehicle being driven in 1st gear:

      Transmission revolution sensor (NT) value is 1450 rpm or more.

    2. Vehicle being driven in 2nd gear:

      Transmission revolution sensor (NT) value is 840 rpm or more.

    3. Vehicle being driven in 3rd gear:

      Transmission revolution sensor (NT) value is 540 rpm or more.

    4. Vehicle being driven in 4th gear:

      Transmission revolution sensor (NT) value is 400 rpm or more.

    5. Vehicle being driven in 5th gear:

      Transmission revolution sensor (NT) value is 330 rpm or more.

    6. Vehicle being driven in 6th, 7th or 8th gear:

      Transmission revolution sensor (NT) value is 300 rpm or more.

  • No vehicle speed signal is transmitted to the ECM for 2 seconds.

  • Open or short in vehicle speed signal circuit

  • Combination meter system

  • ECM

 Comes on DTC stored

SAE Code:

P0500
Table 1. DTC Detection Condition Patterns:
  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnostic Condition Park/neutral position switch D input signal is ON. ○ ○ ○ ○
The counter gear speed is 300 rpm or more. ○ ○ ○ ○
When the vehicle is being driven in 1st gear, the transmission revolution sensor (NT) value is 1450 rpm or more. ○ - - -
When the vehicle is being driven in 2nd gear, the transmission revolution sensor (NT) value is 840 rpm or more. - ○ - -
When the vehicle is being driven in 3rd gear, the transmission revolution sensor (NT) value is 540 rpm or more. - - ○ -
When the vehicle is being driven in 4th gear, the transmission revolution sensor (NT) value is 400 rpm or more. - - - ○
Malfunction Condition No vehicle speed signal is transmitted to the ECM. ○ ○ ○ ○
Duration 2 seconds or more 2 seconds or more 2 seconds or more 2 seconds or more
Detection Logic 1-trip detection logic 1-trip detection logic 1-trip detection logic 1-trip detection logic
Table 2. DTC Detection Condition Patterns:
  Vehicle Condition
Pattern 5 Pattern 6 Pattern 7 Pattern 8
Diagnostic Condition Park/neutral position switch D input signal is ON. ○ ○ ○ ○
The counter gear speed is 300 rpm or more. ○ ○ ○ ○
When the vehicle is being driven in 5th gear, the transmission revolution sensor (NT) value is 330 rpm or more. ○ - - -
When the vehicle is being driven in 6th gear, the transmission revolution sensor (NT) value is 300 rpm or more. - ○ - -
When the vehicle is being driven in 7th gear, the transmission revolution sensor (NT) value is 300 rpm or more. - - ○ -
When the vehicle is being driven in 8th gear, the transmission revolution sensor (NT) value is 300 rpm or more. - - - ○
Malfunction Condition No vehicle speed signal is transmitted to the ECM. ○ ○ ○ ○
Duration 2 seconds or more 2 seconds or more 2 seconds or more 2 seconds or more
Detection Logic 1-trip detection logic 1-trip detection logic 1-trip detection logic 1-trip detection logic
Tip:

This DTC is stored when any of the above detection patterns is met.

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MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven when the transmission counter gear speed is 300 rpm or more. If there is no speed signal from the combination meter despite this condition being met, the ECM interprets this as a malfunction in the speed signal circuit, then illuminates the MIL and stores a DTC.

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CONFIRMATION DRIVING PATTERN

CAUTION:

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

Tip:

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. Drive the vehicle at 13 km/h (8 mph) or more for a total of 2 seconds or more.

  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
    Tip:

    • 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.

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WIRING DIAGRAM

Refer to SFI system DTC P050031.

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CAUTION / NOTICE / HINT

Note:

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

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PROCEDURE


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    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.

    5. Drive the vehicle.

    6. In accordance with the display on the GTS, read the Data List.


      1. 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.



      1. Powertrain > Transmission > Data List
        Tester Display
        Vehicle Speed




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

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    CHECK COMBINATION METER SYSTEM


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

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    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

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    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)


    1. Disconnect the K21 combination meter assembly connector.

    2. Disconnect the A23 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) - A23-39 (SPD) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE ECM


    1. Replace the ECM.

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      Result
      Proceed to
      NEXT