DTC    P0500/42    Vehicle Speed Sensor Malfunction

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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.

G036498E01


DTC No.
DTC Detection Condition
Suspected Area
P0500/42
While the vehicle is being driven, no vehicle speed sensor signal to the ECM
(1 trip detection logic)
  1. Open or short in speed sensor circuit
  2. Vehicle speed sensor
  3. Combination meter
  4. ECM

MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven when the engine speed is more than 2,000 rpm and the Park/Neutral Position (PNP) switch has been OFF for 30 seconds. If there is no signal from the vehicle speed sensor when the vehicle is being driven, the ECM interprets this as a malfunction in the vehicle speed sensor. The ECM illuminates the Malfunction Indicator Lamp (MIL) and sets a DTC.

WIRING DIAGRAM


G034645E01


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1.CHECK OPERATION OF SPEEDOMETER

  1. Drive the vehicle. Check that the speedometer operation is normal.

    OK:
    Speedometer operation is normal.

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



NG
CHECK SPEEDOMETER CIRCUIT
OK


2.CHECK ECM (SPD VOLTAGE)
G034703E01

  1. Move the shift lever to the neutral position.

  1. Jack up one of the rear wheels.

  1. Turn the ignition switch ON.

  1. Turn the rear wheel slowly, and measure the voltage of the ECM connectors.

    Standard:
    Tester Connection
    		Specified Condition
    E10-8 (SPD) - E12-3 (E1)
    		Voltage is generated intermittently

    Tool Setting
    		Condition
    2 V/DIV., 10 msec./DIV.
    		Turn the rear wheel slowly

    HINT:
    The output voltage should fluctuate up and down (as shown in the illustration) when the wheel is turned slowly.



OK
REPLACE ECM
NG


3.CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - ECM)
G034704E02

  1. Disconnect the C8 combination meter connector.

  1. Disconnect the E10 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    C8-6 - E10-8 (SPD)
    		Below 1 Ω
    C8-6 or E10-8 (SPD) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY