ECD SYSTEM, Diagnostic DTC:42

DTC Code DTC Name
42 Vehicle Speed Sensor Signal Circuit Malfunction

DESCRIPTION

The vehicle speed sensor outputs a pulse signal according to the 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 this pulse signal.

A01DOQNE06
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: 2000 to 3300 rpm.

  3. Engine coolant temperature: 70°C (158°F) or higher.

  4. Accelerator pedal opening amount: 60% or more.

  • Open or short in vehicle speed sensor circuit

  • Vehicle speed sensor

  • Combination meter

  • ECM

WIRING DIAGRAM

A01DN88E02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK SPEEDOMETER (OPERATION)


    1. Drive the vehicle and check if the operation of the speedometer in the combination meter assembly 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 Click here

    OK

  2. CHECK ECM (SP1 VOLTAGE)


    1. A01DPECE09
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Move the shift lever to N.

    2. Jack up the vehicle.

    3. Turn the ignition switch to ON.

    4. Check the waveform between the specified terminals of the ECM connectors as the rear wheels are turned slowly.

      OK
      Tester Connection Switch Condition Specified Condition
      G61-9 (SPD) - C101-14 (E1) Ignition switch ON Correct waveform is as shown

    NG

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

    OK

    REPLACE ECM Click here

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


    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
      G61-9 (SPD) - G6-32 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G61-9 (SPD) or G6-32 - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here