ECD SYSTEM, Diagnostic DTC:42

DTC Code DTC Name
42 Vehicle Speed Sensor Signal Circuit 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.

A01KG53E01
DTC No. DTC Detecting Condition Trouble Area
42

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

(a) Vehicle speed signal: 0 km/h (0 mph)

(b) Engine speed: 2,400 - 4,000 rpm

(c) Engine coolant temp.: 60°C (176°F) or more

(d) Accelerator pedal opening angle : 29 % or more

  • Open or short in vehicle speed sensor circuit

  • Vehicle speed sensor

  • Combination meter

  • ECM

WIRING DIAGRAM

A01KF7VE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using intelligent tester. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

PROCEDURE


  1. CHECK OPERATION OF SPEED METER

    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 display is normal.


    NG

    GO TO COMBINATION METER SYSTEM Click here

    OK

  2. CHECK ECM (CHECK VOLTAGE)


    1. A01KFGYE01

      Shift the shift lever to the neutral.

    2. Jack up the rear wheels.

    3. Turn the ignition switch ON.

    4. Measure the voltage between terminal SP1 of the ECM (E9) connector and E1 of the ECM (E7) connector when the wheel is turned slowly.

      Result
      Voltage is generated intermittently.

    NG

    CHECK AND REPLACE HARNESS AND CONNECTOR

    OK

    CHECK AND REPLACE ECM Click here