СИСТЕМА ECD, Diagnostic DTC:P0502, P0503

DTC Code DTC Name
P0502 Vehicle Speed Sensor "A" Circuit Low
P0503 Vehicle Speed Sensor "A" Intermittent / Erratic / High

DESCRIPTION

Vehicles which are equipped with ABS (Anti-lock Brake System) detect the vehicle speed using the skid control ECU and wheel speed sensor. 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.

A012FHLE02
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0502 Vehicle Speed Sensor "A" Circuit Low

No vehicle speed sensor signal to ECM

(2 trip detection logic)

  • Open or short in speed signal circuit

  • Combination meter

  • ECM

 Comes on DTC stored
P0503 Vehicle Speed Sensor "A" Intermittent / Erratic / High

Vehicle speed exceeds threshold

(2 trip detection logic)

  • Open or short in speed signal circuit

  • Combination meter

  • ECM

 Comes on DTC stored
Table 1. DTC Detection Drive Pattern
DTC No. DTC Detection Drive Pattern

P0502

P0503

 Vehicle is driven with engine under high load
Table 2. Related Data List
DTC No. Data List

P0502

P0503

 Vehicle Speed

WIRING DIAGRAM

A012H0UE01
Table 3.
*a from Skid Control ECU (Brake Actuator Assembly)
*b Combination Meter Assembly
*c To Other ECUs

CAUTION / NOTICE / HINT

Note:

When replacing the ECM, perform ECM Initialization and Registration.

Click here Нажмите здесь

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition 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, and other data from the time the malfunction occurred.

PROCEDURE

  1. READ VALUE USING GTS (VEHICLE SPEED)

    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Vehicle Speed.

      Powertrain > Engine and ECT > Data List
      Tester Display
      Vehicle Speed

    4. Drive the vehicle.

    5. Read the value displayed on the GTS.

      OK
      Vehicle speeds displayed on the GTS and the speedometer display are equal.
      Result
      Proceed to
      OK
      NG
    OK

    CHECK FOR INTERMITTENT PROBLEMS Click hereНажмите здесь

    NG

  2. CHECK COMBINATION METER SYSTEM

    1. Inspect the circuit that sends vehicle speed signals to the combination meter system.

      Click here Нажмите здесь

      Result
      Proceed to
      NEXT
    NEXT

  3. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Start the engine.

    6. Drive the vehicle with the engine under high load and in high gear.

      ОСТОРОЖНО

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    7. Enter the following menus: Powertrain / Engine and ECT/ Trouble Codes / Pending.

    8. Confirm that the pending DTC is not output again.

      Powertrain > Engine and ECT > Trouble Codes
      Tip:

      If no DTCs (no pending DTCs) are output to the GTS, the repair has been successfully completed.

      Result
      Proceed to
      NEXT
    NEXT

    END