СИСТЕМА ECD, Diagnostic DTC:42

DTC Code DTC Name
42 Vehicle Speed Sensor Signal Circuit Malfunction

DESCRIPTION

The speed sensor for skid control ECU detects the wheel speed and sends the appropriate signals to the skid control ECU.

The ECM converts these signals into a 4-pulse signal and outputs it to the combination meter.

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.

A01BEMTE01
DTC No. DTC Detection Condition Trouble Area
42

All conditions below are detected continuously for 8 sec. or more:


  1. Vehicle speed signal: 0 km/h (0 mph)

  2. Engine speed: 2,000 - 3,300 rpm

  3. Engine coolant temp.: 70°C (158°F) or more

  4. Accelerator pedal opening angle : 60 % or more

  • Open or short in vehicle speed sensor circuit

  • Vehicle speed sensor

  • Combination meter

  • ECM

WIRING DIAGRAM

A01BFBNE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK OPERATION OF SPEEDOMETER


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

      OK
      The speedometer operates normally according to vehicle speed.

      Tech Tips

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


    NG

    CHECK SPEEDOMETER CIRCUIT

    OK

  2. INSPECT ECM (CHECK VOLTAGE)


    1. A01BGBJE01

      Shift the shift lever to the neutral position.

    2. Jack up the vehicle.

    3. Turn the ignition switch ON.

    4. Measure the voltage between the terminals SPD and E1 of the ECM connector when the wheel is turned slowly.

      OK
      Tester Connection Specified Condition
      SPD (B10-9) - E1 (D2-14) Correct waveform shown

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) Click here

    OK

    REPLACE ECM

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


    1. A01BB0ME01

      Disconnect the combination meter connector.

    2. Disconnect the ECM B10 connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      +S (H20-9) - SPD (B10-9) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      SPD (B10-9) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM