Engine Control System: SFI System

3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0500: Vehicle Speed Sensor "A"
P0500 - Vehicle Speed Sensor "A"

DESCRIPTION

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.

MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven when the indicated vehicle speed is more than 9 km/h (5.6 mph). If there is no speed signal from the combination meter despite these conditions being met, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and sets the DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

HINT
*: Only for 4WD specification vehicle

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

1. Connect Techstream to the DLC3.

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

3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

4. Turn the ignition switch off and wait for at least 30 seconds.

5. Turn the ignition switch to ON and turn the Techstream on [A].

6. Start the engine.

7. Drive the vehicle at 24 km/h (15 mph) or more for a total of 30 seconds or more [B].

8. Stop the vehicle.

9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].

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. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

12. Input the DTC: P0500.

13. Check the DTC judgment result.

HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

14. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

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

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. CHECK OPERATION OF SPEEDOMETER

(a) Drive the vehicle and check whether the operation of the speedometer in the combination meter 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 in Speedometer Malfunction Speedometer Malfunction.

NG -- GO TO MALFUNCTION IN SPEEDOMETER Speedometer Malfunction
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (VEHICLE SPD)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream ON.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Vehicle Speed.

(e) Drive the vehicle.

(f) Read the value displayed on the Techstream.

OK:

Vehicle speeds displayed on Techstream and speedometer display are equal.

NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems

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

(a) Disconnect the J28 combination meter connector.

(b) Disconnect the A24 ECM connector.

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

Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- CHECK COMBINATION METER ASSEMBLY (+S VOLTAGE)

4. CHECK COMBINATION METER ASSEMBLY (+S VOLTAGE)

(a) Disconnect the J28 combination meter connector.

(b) Turn the ignition switch to ON.

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

Standard voltage:

NG -- REPLACE ECM Removal
OK -- Continue to next step.

5. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)

(a) Move the shift lever to the neutral position.

(b) Jack up the vehicle.

(c) Turn the ignition switch to ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard voltage:

HINT
The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.

NG -- CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL INPUT WAVEFORM))

OK -- REPLACE ECM

6. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL INPUT WAVEFORM))

HINT
The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.

NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE ACTUATOR)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

7. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE ACTUATOR)

(a) Disconnect the combination meter connector.

(b) Disconnect the brake actuator connector.

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

Standard Resistance:

NG -- END

OK -- REPLACE BRAKE ACTUATOR ASSEMBLY