AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0500

DTC Code DTC Name
P0500 Vehicle Speed Sensor "A"

DESCRIPTION

The speed sensors detect the wheel speed and send the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a pulse signal and outputs it to the TCM via the combination meter. The TCM determines the vehicle speed based on the frequency of this pulse signal.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0500 Vehicle Speed Sensor "A" When the engine coolant temperature sensor is normal and the counter gear speed is 300 rpm or more, the vehicle speed signal is not input for 2 seconds or more (1-trip detection logic).

  • Open or short in vehicle speed signal circuit

  • Combination meter system

  • TCM

 Comes on DTC stored

MONITOR DESCRIPTION

The TCM assumes that the vehicle is being driven when the transmission counter gear speed is more than 300 rpm and over 30 seconds have passed since the park/neutral position switch was turned off. If there is no vehicle speed signal with these conditions satisfied, the TCM concludes that there is a vehicle speed signal malfunction. The TCM will turn on the MIL and store the DTC.

WIRING DIAGRAM

A01V9GHE01
for LHD
*a from Skid Control ECU
*b Combination Meter
*c No. 20 Junction Connector
A01V9GHE02
for RHD
*a from Skid Control ECU
*b Combination Meter
*c No. 24 Junction Connector

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

Click here

PROCEDURE


  1. READ VALUE USING GTS (VEHICLE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / ECT / Data List.

    5. Drive the vehicle.

    6. Read the value displayed on the GTS.


      Powertrain > ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Vehicle Speed Vehicle speed

      Min.: 0 km/h (0 mph)

      Max.: 255 km/h (158 mph)

      		 Actual vehicle speed -

      Powertrain > ECT > Data List
      Tester Display
      Vehicle Speed
      OK
      Vehicle speed displayed on GTS and speedometer display are equal.
      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK COMBINATION METER SYSTEM


    1. Inspect the circuits that send vehicle speed signals to this system in the meter system.

      Click here

    2. During inspection for the meter section, if there is an instruction that indicates to go back to inspections for each system, proceed to the next step.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TCM)


    1. Disconnect the G16 combination meter assembly connector.

    2. Disconnect the B79 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G16-6 (+S) - B79-3 (SPD) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TCM Click here

    NG

  4. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - TCM)


    1. for LHD:

      Disconnect the G108 No. 20 junction connector.

    2. for RHD:

      Disconnect the G112 No. 24 junction connector.

    3. Disconnect the B79 TCM connector.

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

      Standard Resistance
      for LHD:
      Tester Connection Condition Specified Condition
      G108-15 - B79-3 (SPD) Always Below 1 Ω
      for RHD:
      Tester Connection Condition Specified Condition
      G112-8 - B79-3 (SPD) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE JUNCTION CONNECTOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR