EMISSION CONTROL SYSTEM, Diagnostic DTC:42

DTC Code DTC Name
42 Vehicle Speed Sensor Signal Circuit Malfunction

DESCRIPTION

This sensor is mounted in the combination meter. It contains a magnet which is rotated by the speedometer cable.

Turning the reed switch ON and OFF 4 times for every revolution of the speedometer.

It is then transmitted to the ECU. The ECU determines the vehicle speed based on the frequency of these pulse signals.

A01KH87E01
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: 2,000 - 3,200 rpm

(c) Engine coolant temp.: 80°C (176°F) or more

(d) Load driving

  • Open or short in vehicle speed sensor circuit


  • Vehicle speed sensor


  • Combination meter


  • Emission ECU

Tech Tips

In the test mode, DTC 42 is output when the vehicle speed is 5 km/h (3 mph) or below.

WIRING DIAGRAM

A01KERTE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK SPEEDOMETER ASSEMBLY


    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 display is normal.


    NG

    CHECK AND REPLACE SPEEDOMETER ASSEMBLY

    OK

  2. CHECK SPEEDOMETER SENSOR


    1. Shift the shift lever to neutral.

    2. Jack up one of the front wheels.

    3. Turn the ignition switch ON.

    4. A01KHLFE09
      A01KEAHE01

      Measure the voltage between terminals SP1 and E1 of the emission ECU when the wheel is turned slowly.

      VOLTAGE
      PULSE GENERATION

    NG

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR (COMBINATION METER-EMISSION ECU)

    OK

    CHECK AND REPLACE EMISSION CONTROL ECU Click here