SFI SYSTEM (w/ Secondary Air Injection System), Diagnostic DTC:P0500

DTC Code DTC Name
P0500 Vehicle Speed Sensor "A"

DESCRIPTION

Vehicles, which are equipped with ABS (Anti-lock Brake System), detect the vehicle speed using the skid control ECU and wheel speed sensor. 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. The ECM determines the vehicle speed based on the frequency of the pulse signal.

A01BFVTE04
DTC No. DTC Detection Conditions Trouble Areas
P0500

  • ECM detects following conditions simultaneously 500 times

    (2 trip detection logic)


    • No SP1 (speed sensor) signal while ECM detects SP2 (No.2 speed sensor) signal

    • Vehicle speed 9 km/h (6 mph) or more for 4 seconds

    • Park/Neutral position switch OFF (shift lever in any positions other than P and N positions)

  • Open or short in speed signal circuit

  • Combination meter

  • ECM

  • Skid control ECU

MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven, while the vehicle speed sensor signal is being transmitted by the combination meter. If there is no signal from the combination meter, despite the ECM detecting the speed signal from the speed sensor No.2, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and sets the DTC.

WIRING DIAGRAM

A01BEZEE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using an 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK OPERATION OF SPEEDOMETER


    1. Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.

      Tech Tips

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


    NG

    CHECK SPEEDOMETER CIRCUIT

    OK

  2. INSPECT ECM (SPD VOLTAGE)


    1. A01BC47E01

      Shift the transmission gear selector lever to the neutral position.

    2. Jack up the vehicle.

    3. Turn the ignition switch to the ON position.

    4. Measure the voltage between the terminals of the ECM connectors as the wheel is turned slowly.

      Standard
      Tester Connections Specified Conditions
      SPD (B7-8) - E1 (D1-3) Voltage generated intermittently

      Tech Tips

      The output voltage should fluctuate up and down similarly to the diagram in the illustration when the wheel is turned slowly.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM