SFI SYSTEM, Diagnostic DTC:P0500

DTC Code DTC Name
P0500 Vehicle Speed Sensor "A"

DESCRIPTION

The wheel 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.

Tech Tips


  • 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 in the diagram below will not operate normally.

A019KHEE55
DTC No. DTC Detection Condition Trouble Area
P0500

Both of the following conditions (A) and (B) are met

(1 trip detection logic)

(A) Either of the following conditions 1 or 2 is met


  1. All of the following conditions (a), (b) and (c) are met


    1. Engine coolant temperature is 20°C (68°F) or more

    2. Engine coolant temperature sensor circuit malfunction is not detected

    3. Time after NSW input signal on to off is 10 seconds or more

  2. All of the following conditions (a), (b) and (c) are met


    1. Engine coolant temperature is less than 20°C (68°F)

    2. Engine coolant temperature sensor malfunction is detected

    3. Time after NSW input signal on to off is 30 seconds or more

(B) While vehicle is being driven, no vehicle speed sensor signal is sent to ECM

  • Open or short in speed signal circuit

  • Combination meter assembly

  • Skid control ECU

  • Power management control ECU

  • Stereo component amplifier assembly

  • Multi-media module receiver assembly*1

  • Radio receiver assembly*2

  • Windshield wiper switch assembly*3

  • TCM

  • ECM

*1: w/ Navigation system

*2: w/o Navigation system

*3: w/ Auto wiper system

WIRING DIAGRAM

A019MCFE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. 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.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Vehicle Speed.

    5. Drive the vehicle.

    6. Read the value displayed on the tester.

      OK
      Vehicle speeds displayed on the tester and speedometer display are equal.

    NG

    CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)


    1. Inspect the combination meter assembly using an oscilloscope.


      1. Jack up the vehicle.

      2. Turn the engine switch on (IG).

      3. Move the shift lever to neutral position.

      4. A019O36E08
        Text in Illustration
        *a

        Component without harness connected

        (Combination Meter Assembly)

        Measure the voltage between the terminal of the combination meter assembly and body ground while the wheel is turned slowly.

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        F15-3 (+S) - Body ground Engine switch on (IG) Voltage generated intermittently

        Tech Tips

        When the system is functioning normally, one wheel revolution generates 4 pulses. As vehicle speed increases, the width indicated by (A) in the illustration narrows.


    NG

    CHECK METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT) Click here

    OK

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


    1. Disconnect the ECM connector.

    2. Disconnect the combination meter assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F15-3 (+S) - A70-15 (SPD) Always Below 1 Ω

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - COMBINATION METER ASSEMBLY)

    OK

    REPLACE ECM Click here