SFI SYSTEM, Diagnostic DTC:P0500

DTC Code DTC Name
P0500 Vehicle Speed Sensor Malfunction

DESCRIPTION

The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.

A01J77ZE01
DTC No. DTC Detection Condition Trouble Area
P0500

While vehicle is being driven, no vehicle speed sensor signal input to ECM

(2 trip detection logic)

  • Open or short in speed sensor circuit

  • Vehicle speed sensor

  • Combination meter

  • ECM

MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven when the engine speed is more than 2,000 rpm and the Park/Neutral Position (PNP) switch has been OFF for 30 seconds. If there is no signal from the vehicle speed sensor when the vehicle is being driven, the ECM interprets this as a malfunction in the vehicle speed sensor.

The ECM illuminates the Malfunction Indicator Lamp (MIL) and sets the DTC.

WIRING DIAGRAM

A01J3CZE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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. CHECK COMBINATION METER (OPERATION OF SPEEDOMETER)


    1. Drive the vehicle. Check that the speedometer operation is normal.

      OK
      Speedometer operation is normal.

      Tech Tips

      The vehicle speed sensor is operating normally if the speedometer reading is normal.


    NG

    CHECK SPEEDOMETER CIRCUIT

    OK

  2. CHECK ECM (SPD VOLTAGE)

    A01J5UEE01

    1. Move the shift lever to the neutral position.

    2. Jack up one of the rear wheels.

    3. Turn the ignition switch ON.

    4. Turn the rear wheel slowly, and measure the voltage of the ECM connectors.

      OK
      Tester Connection Specified Condition
      E13- 8 (SPD) - E17-1 (E1) Correct waveform is as shown
      Tool Setting Condition
      2 V/DIV., 20 msec./DIV. Driving at 20 km/h (12 mph)

      Tech Tips

      The output voltage should fluctuate up and down (as shown in the illustration) when the wheel is turned slowly.


    OK

    REPLACE ECM

    NG

  3. CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - ECM)

    A01J39DE07

    1. Disconnect the C27 combination meter connector.

    2. Disconnect the E13 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      C27-6 - E13-8 (SPD) Below 1 Ω
      C27-6 or E13-8 (SPD) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY