Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Vehicle Speed Sensor "A" No Signal (P050031)

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 Code

DTC Detection Condition

Trouble Area

SAE

P050031

All conditions are met for 5 seconds or more (1 trip detection logic):

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

(b) Either condition is met.

  • Gear position is 1st:

    Transmission revolution sensor (NT) value is 1310 rpm or more.

  • Gear position is 2nd, 3rd, 4th, 5th or 6th:

    Transmission revolution sensor (NT) value is 760 rpm or more.

(c) Transmission revolution sensor (SP2) value is 9 km/h (5.59 mph) or more.

(d) No vehicle speed is transmitted to the ECM.

  • Open or short in vehicle speed signal circuit
  • Combination meter system
  • ECM

P0500

MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven when the indicated vehicle speed is 9 km/h (5.59 mph) 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 (SP2), ECT sensor

Frequency of operation

Continuous

Duration

5 sec.

MIL operation

Immediately

Sequence operation

None

TYPICAL ENABLING CONDITIONS

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF

Engine

Running

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

Time after ignition switch OFF to ON

3 sec. or more

Pressure control solenoid circuit fail (P0748, P0778, P0798, P2716, P2810)

Not detected

Vehicle speed at output speed sensor

9 km/h (5.59 mph) or more

Either of the following conditions is met

Conditions 1 or 2

1. All of the following conditions are met

-

ECM selected gear

1st

Turbine speed sensor revolution

1310 rpm or more

2. All of the following conditions are met

-

ECM selected gear

Not 1st

Turbine speed sensor revolution

760 rpm 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 (See page ).
  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 9 km/h (5.59 mph) or more for a total of 5 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 (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs (See page Perform registration and/or initialization when parts related to the ).
  • Perform registration and/or initialization when parts related to the automatic transmission are replaced (See page ).

PROCEDURE

1.

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the Ignition switch 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 (See page (b) During inspection for the meter section, if there is an instruction that ).

(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 C9 combination meter assembly connector.

(b) Disconnect the E13 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C9-40 (+S) - E13-24 (SPD)

Always

Below 1 Ω

C9-40 (+S) or E13-24 (SPD) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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