Vehicle Speed Sensor "A" (P0500)

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU.

The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of these pulse signals.

If there is no speed signal from the combination meter assembly even though the ECM determines that the vehicle is being driven, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and stores the DTC.

1. 1
   Connect the Techstream to the DLC3.
2. 2
   Turn the ignition switch to ON and turn the Techstream on.
3. 3
   Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).
4. 4
   Turn the ignition switch off and wait for at least 30 seconds.
5. 5
   Turn the ignition switch to ON and turn the Techstream on [A].
6. 6
   Start the engine.
7. 7
   Drive the vehicle at 24 km/h or more for a total of 30 seconds or more [B].

   CAUTION:

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

8. 8
   Stop the vehicle.
9. 9
   Enter the following menus: Powertrain / Engine / Trouble Codes [C].
10. 10
    Read the Pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. 11
    Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. 12
    Input the DTC: P0500.
13. 13
    Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
14. 14
    If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).
    

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

HINT:

Read freeze frame data using the Techstream. 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.

1. READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Drive the vehicle and check whether the operation of the speedometer in the combination meter assembly is normal.

HINT:

• The vehicle speed sensor is operating normally if the speedometer reading is normal.
• If the speedometer does not operate, check it by following the procedure described for a speedometer malfunction.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / Vehicle Speed.

(f) Drive the vehicle.

(g) Read the value displayed on the Techstream.

OK:

Vehicle speeds displayed on the Techstream and speedometer display are equal.

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

1. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

(a) Inspect the combination meter assembly using an oscilloscope. (1) Jack up the vehicle. (2) Move the shift lever to N. (3) Turn the ignition switch to ON. (4) Measure the voltage between the terminal of the combination meter assembly and the body ground while the wheel is turned slowly. Standard Voltage: Tester Connection Switch Condition Specified Condition E1-16 (+S) - Body ground Ignition switch ON Voltage generated intermittently Text in Illustration *1 Turn Wheel *a Rear view of wire harness connector (to Combination Meter Assembly) HINT: The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.

NG

GO TO METER / GAUGE SYSTEM

OK

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

(a) Disconnect the combination meter connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ASSEMBLY - ECM)