Dtc 42 Vehicle Speed Sensor Signal Circuit Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK SPEEDOMETER (OPERATION)

CHECK ECM (SP1 VOLTAGE)

CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)

DTC 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.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 42 Vehicle Speed Sensor Signal Circuit Malfunction


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 to 3,300 rpm
  3. Engine coolant temperature: 70°C (158°F) or more
  4. Accelerator pedal opening angle: 60% or more
  1. Open or short in vehicle speed sensor circuit
  2. Vehicle speed sensor
  3. Combination meter
  4. ECM

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 42 Vehicle Speed Sensor Signal Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK SPEEDOMETER (OPERATION)

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


NG
CHECK SPEEDOMETER CIRCUIT
OK


2.CHECK ECM (SP1 VOLTAGE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 42 Vehicle Speed Sensor Signal Circuit Malfunction

  1. Move the shift lever to the neutral position.

  1. Jack up the vehicle.

  1. Turn the ignition switch ON.

  1. Measure the voltage between the terminals SP1 and E1 of the ECM connector when the wheel is turned slowly.

    OK:
    Tester Connection
    		Specified Condition
    E20-9 (SP1) - E23-14 (E1)
    		Correct waveform is as shown


OK
REPLACE ECM
NG


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


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 42 Vehicle Speed Sensor Signal Circuit Malfunction

  1. Disconnect the E23 ECM connector.

  1. Disconnect the C10 combination meter connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E23-9 (SP1) - C10-6
    		Below 1 Ω
    E23-9 (SP1) or C10-6 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM