SFI SYSTEM, Diagnostic DTC:P0500

DTC Code DTC Name
P0500 Vehicle Speed Sensor "A"

DESCRIPTION

The wheel speed sensor monitors the wheel rotation speed and sends a signal to the skid control ECU. The skid control ECU converts the wheel speed signal into a 4-pulse signal and transmits it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of the pulse signal.

Tech Tips


  • A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.

  • If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.

A017D4UE23
DTC No. DTC Detection Condition Trouble Area
P0500

While vehicle being driven, no vehicle speed sensor signal to ECM.

(1 trip detection logic)

  • Open or short in speed signal circuit

  • Combination meter

  • Skid control ECU

  • Vehicle speed sensor

  • Headlight beam level control ECU

  • Main body ECU

  • Radio receiver assembly

  • Navigation receiver assembly

  • Windshield wiper relay

  • Clearance warning ECU

  • ECM

WIRING DIAGRAM

A017DEJE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

PROCEDURE


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


    1. A017E90E06

      Disconnect the ECM connector.

    2. Disconnect the combination meter connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      E1-36 (+S) - D32-8 (SPD) Always Below 1 Ω

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter connector.


    NG

    CHECK HARNESS AND CONNECTOR (ECM - JUNCTION CONNECTOR) Click here

    OK

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    1. A017G2RE01

      Remove the combination meter.

    2. Connect the oscilloscope to terminal E1-9(+S) and body ground.

    3. Turn the ignition switch on (IG).

    4. Turn the wheel slowly.

    5. Check the signal waveform according to the condition(s) in the table below.

      Item Condition
      Tool setting 5 V / DIV., 20 ms / DIV.
      Vehicle condition Driving at approx. 20 km/h (12 mph)
      OK
      The waveform is displayed as shown in the illustration.

      Tech Tips

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.


    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

    REPLACE ECM Click here

  3. CHECK HARNESS AND CONNECTOR (ECM - JUNCTION CONNECTOR)


    1. A017FTYE02

      Disconnect the ECM connector.

    2. Disconnect the junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      D46-11 - D32-8 (SPD) Always Below 1 Ω

    4. Reconnect the ECM connector.

    5. Reconnect the junction connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - JUNCTION CONNECTOR)

    OK

    REPAIR OR REPLACE JUNCTION CONNECTOR (NO. 4 JUNCTION CONNECTOR)