Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GYQZ
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [01/2019 - 03/2019]
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P050031; Vehicle Speed Sensor "A" No Signal; 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]

DTC

P050031

Vehicle Speed Sensor "A" No Signal

DESCRIPTION

  • w/ Smart Key System
    • Vehicles, which are equipped with ABS (Anti-lock Brake System), detect the vehicle speed using the skid control ECU (brake actuator assembly) and speed sensor. The speed sensor monitors the wheel rotation speed and sends a signal to the skid control ECU. The skid control ECU detects the wheel speed of all 4 wheels and outputs a 4-pulse signal to the ECM via the certification ECU (smart key ECU assembly) and combination meter assembly. The ECM determines the vehicle speed based on the frequency of the pulse signal.
  • w/o Smart Key System
    • Vehicles, which are equipped with ABS (Anti-lock Brake System), detect the vehicle speed using the skid control ECU (brake actuator assembly) and speed sensor. The speed sensor monitors the wheel rotation speed and sends a signal to the skid control ECU. The 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.

HINT:

  • 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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P050031

Vehicle Speed Sensor "A" No Signal

Diagnosis condition:

  • Vehicle being driven. (for continuously variable transaxle models)
  • Fuel cut being performed. (for manual transaxle models)

Abnormal condition:

  • No vehicle speed sensor signal transmitted to ECM.

Malfunction time:

  • 5 seconds or more (for continuously variable transaxle models)
  • 5.7 seconds or more (for manual transaxle models)

Trip logic:

  • 2 trip detection logic

Detection conditions:

  • Continuous

Sensors/components used for detection (Main):

  • Vehicle speed sensor
  • Combination meter assembly
  • Certification ECU (smart key ECU assembly) (w/ Smart Key System)
  • Skid control ECU

Sensors/components used for detection (Related):

  • Park/neutral position switch assembly (for continuously variable transaxle models)
  • Clutch start switch assembly (for manual transaxle models)
  • Engine coolant temperature sensor
  • Crankshaft position sensor
  • Speed sensor
  • Throttle position sensor
  • Mass air flow meter sub-assembly
  • Open or short in speed signal circuit
  • Combination meter assembly
  • ECM
  • Speed signal circuit

Comes on

DTC stored

SAE Code: P0500

MONITOR DESCRIPTION

When the vehicle is being driven (for continuously variable transaxle models) or when the vehicle is being driven and fuel cut is being performed (for manual transaxle models), if no vehicle speed signal is received for 5 seconds or more (for continuously variable transaxle models) or for 5.7 seconds or more (for manual transaxle models), the ECM determines that the vehicle speed signal circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0500: Vehicle speed sensor verify pulse input

Required Sensors/Components (Main)

Vehicle speed sensor

Combination meter assembly

Certification ECU (smart key ECU assembly) (w/ Smart Key System)

Skid control ECU

Required Sensors/Components (Related)

Park/neutral position switch assembly (for continuously variable transaxle models)

Clutch start switch assembly (for manual transaxle models)

Engine coolant temperature sensor

Crankshaft position sensor

Speed sensor

Throttle position sensor

Mass air flow meter sub-assembly

Frequency of Operation

Continuous

Duration

5 seconds (for continuously variable transaxle models)

5.7 seconds (for manual transaxle models)

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

for Continuously Variable Transaxle Models:

Monitor runs whenever the following DTCs are not present

None

All of the following conditions are met

-

Battery voltage

8 V or higher

Ignition switch

ON

Starter

Off

Engine

Running

Time after ignition switch off to ON

3 seconds or more

Vehicle speed sensor monitor condition

Met

for Manual Transaxle Models:

Monitor runs whenever the following DTCs are not present

None

All of the following conditions are met

-

Battery voltage

8 V or higher

Ignition switch

ON

Starter

Off

Time after ignition switch off to ON

3 seconds or more

Fuel-cut

On

TYPICAL MALFUNCTION THRESHOLDS

Vehicle speed sensor signal

No signal

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

for Continuously Variable Transaxle Models:

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream 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 [A].
  7. Turn the Techstream on.
  8. Start the engine [B].
  9. Drive the vehicle at 24 km/h (15 mph) or more for a total of 30 seconds or more [C].

    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 [D].
  12. Read the pending DTCs.

    HINT:

    • 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. Proceed to the next screen and enter the DTC to be checked.
  15. 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [C] through [D] again.
    • [A] to [D]: Normal judgment procedure.

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

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

for Manual Transaxle Models:

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream 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 [A].
  7. Turn the Techstream on.
  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. Decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel-cut [C].
  11. Stop the vehicle.
  12. Enter the following menus: Powertrain / Engine / Trouble Codes [D].
  13. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  15. Proceed to the next screen and enter the DTC to be checked.
  16. 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [B] through [D] again.
    • [A] to [D]: Normal judgment procedure.

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

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

  • Read Freeze Frame Data using the Techstream. 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.
  • If DTC P050031 is output, perform troubleshooting for the transaxle first as the transaxle may have a mechanical malfunction. (for continuously variable transaxle models)

    Click here 2019 - 2020 MY Corolla Corolla Hatchback [06/2018 - 03/2019]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: MECHANICAL SYSTEM TESTS

PROCEDURE

1.

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

HINT:

This procedure confirms whether the speedometer is operating correctly.

(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 / Engine / Data List / Vehicle Speed.

Powertrain > Engine > Data List

Tester Display

Vehicle Speed

(e) Drive the vehicle.

(f) Read the value displayed on the Techstream.

Result

Proceed to

Values displayed on Techstream and speedometer display not equal

A

Values displayed on Techstream and speedometer display equal

B
B

CHECK FOR INTERMITTENT PROBLEMS

A

2.

CHECK COMBINATION METER SYSTEM

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

Click here 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 04/2020]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): Speed Signal Circuit

NEXT

3.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

(a) Disconnect the combination meter assembly connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I4-36 (+S) - A47-42 (SPD)

Always

Below 1 Ω
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR