Engine Control System: SFI System

1UR-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 pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of this pulse signal.









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 this condition being met, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and stores the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





- *: Only for 4WD vehicles

TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





1. Connect the 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 SPEED)

(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 the 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 combination meter connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:





HINT
If the wire has a short, check the speed signal circuit in other systems related to the vehicle speed signal (e.g. the tire pressure warning system, audio system, etc.).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (OTHER SYSTEMS RELATED TO SPEED SIGNAL)
OK -- Continue to next step.

4. INSPECT COMBINATION METER ASSEMBLY (+S VOLTAGE)





(a) Disconnect the 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:





HINT
A voltage of 5 or 12 V is output from each ECU and then input to the combination meter assembly.

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

5. INSPECT COMBINATION METER ASSEMBLY (SPD SIGNAL OUTPUT WAVEFORM)





(a) Move the shift lever to N.

(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.
* A voltage of 5 or 12 V is output from each ECU and then input to the combination meter assembly.

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

OK -- REPLACE ECM Removal

6. INSPECT COMBINATION METER ASSEMBLY (SPD SIGNAL INPUT 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 HARNESS AND CONNECTOR (COMBINATION METER - VSC ACTUATOR ASSEMBLY)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

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





(a) Disconnect the combination meter connector.

(b) Disconnect the skid control ECU connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE VSC ACTUATOR ASSEMBLY