Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018BOZ
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P050031; Vehicle Speed Sensor "A" No Signal; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

P050031

Vehicle Speed Sensor "A" No Signal

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 conditions are met for 2 seconds or more (1 trip detection logic):

(a) Park/neutral position switch D input signal is ON.

(b) Any one condition is met.

  • Gear position is 1st:

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

  • Gear position is 2nd:

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

  • Gear position is 3rd:

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

  • Gear position is 4th:

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

  • Gear position is 5th:

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

  • Gear position is 6th, 7th or 8th:

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

(c) The counter gear speed is 300 rpm or more.

(d) No vehicle speed is transmitted to the ECM.
  • Open or short in vehicle speed signal circuit
  • Combination meter 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 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. The ECM then illuminates the MIL and stores the DTC.

MONITOR STRATEGY

Related DTCs

P0500: Vehicle speed sensor/Verify pulse input

Required sensors/components (Main)

Vehicle speed sensor, Combination meter, Skid control ECU

Required sensors/components (Sub)

Transmission revolution sensor (NT), ECT sensor

Frequency of operation

Continuous

Duration

2 seconds

MIL operation

Immediately

Sequence operation

None

TYPICAL ENABLING CONDITIONS

Battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

Engine

Running

Intermediate shaft speed sensor revolution

300 rpm or more

Shift change

Shift change is completed before starting next shift change operation

R position switch

OFF

D position switch

ON

Park/neutral position switch (NSW)

OFF

Pressure control solenoid circuit fail (P08C1, P08C2, P0962, P0963, P0966, P0967, P0970, P0971, P2720, P2721, P2814, P2815, P281D, P281E)

(Pending + MIL)

Not detected

Torque Converter Clutch Pressure Control Solenoid circuit fail (P2763, P2764)

(Pending + MIL)

Not detected

Torque Converter Clutch Solenoid circuit fail (P2769, P2770)

(Pending + MIL)

Not detected

One of the following conditions is met: Condition (A), (B), (C), (D), (E), (F), (G) or (H)

  • Condition (A)

    ECM selected gear

    1st

    Turbine speed sensor revolution

    1450 rpm or more

    Condition (B)

    ECM selected gear

    2nd

    Turbine speed sensor revolution

    840 rpm or more

    Condition (C)

    ECM selected gear

    3rd

    Turbine speed sensor revolution

    540 rpm or more

    Condition (D)

    ECM selected gear

    4th

    Turbine speed sensor revolution

    400 rpm or more

    Condition (E)

    ECM selected gear

    5th

    Turbine speed sensor revolution

    330 rpm or more

    Condition (F)

    ECM selected gear

    6th

    Turbine speed sensor revolution

    300 rpm or more

    Condition (G)

    ECM selected gear

    7th

    Turbine speed sensor revolution

    300 rpm or more

    Condition (H)

    ECM selected gear

    8th

    Turbine speed sensor revolution

    300 rpm or more

Either of the following conditions is met: Condition (I) or (J)

  • Condition (I)

    ECT

    20°C (68°F) or more

    ECT sensor circuit fail (P0117, P0118)

    (Pending + MIL)

    Not detected

    Time after park/neutral position switch ON to OFF

    2 sec. or more

    Condition (J)

    Either of the following conditions is met

    (1) or (2)

    (1) ECT

    Less than 20°C (68°F)

    (2) ECT sensor circuit fail (P0117, P0118)

    (Pending + MIL)

    Detected

    Time after park/neutral position switch ON to OFF

    30 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

Vehicle speed sensor signal

No signal

CONFIRMATION DRIVING PATTERN

CAUTION:

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

HINT:

  • 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.
  • When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

    Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Drive the vehicle at 12 km/h (7.46 mph) or more for a total of 2 seconds or more. [*1]

    HINT:

    [*1] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  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.

    Techstream 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

    HINT:

    • 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 normal judgment procedure again.

WIRING DIAGRAM

Refer to SFI system DTC P050031.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: P050031; Vehicle Speed Sensor "A" No Signal+

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: DTC CHECK / CLEAR

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

    Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: PRECAUTION

PROCEDURE

1.

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the Ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Transmission / Data List.

(e) Drive the vehicle.

(f) In accordance with the display on the Techstream, read the Data List.

Transmission:

Techstream 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.

OK:

Vehicle speed displayed on Techstream and speedometer display are equal.

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

2.

CHECK COMBINATION METER SYSTEM

(a) Check the circuits that send vehicle speed signals to this system in the meter system.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Speed Signal Circuit

(b) 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.

NEXT

3.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

(a) Disconnect the D145 combination meter assembly connector.

(b) Disconnect the A69 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D145-3 (+S) - A69-39 (SPD)

Always

Below 1 Ω

D145-3 (+S) or A69-39 (SPD) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

REPLACE ECM

(a) Replace the ECM.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: COMPONENTS

NEXT

PERFORM A/T CODE REGISTRATION