Engine Control System: SFI System

1GR-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 vehicle speed measured by the output speed sensor (SP2) 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

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 the 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.

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 ASSEMBLY - ECM)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems

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

(a) Disconnect the combination meter connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

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

NG -- CHECK ALL SYSTEMS RELATED TO SPEED SENSOR SIGNAL AND REPAIR OR REPLACE MALFUNCTIONING HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK COMBINATION METER ASSEMBLY (+S VOLTAGE)

(a) Disconnect the combination meter assembly connector.

HINT
Disconnect the ECU connectors of other systems related to the speed signal, but do not disconnect the ECM connectors.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Text in Illustration

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

5. CHECK COMBINATION METER (SPD SIGNAL OUTPUT WAVEFORM)

(a) Remove the combination meter assembly.

(b) Connect the combination meter assembly connector.

(c) Move the shift lever to N.

(d) Jack up the vehicle.

(e) Turn the ignition switch to ON.

(f) Check the voltage between the terminal of the combination meter assembly and body ground while the wheels are turned slowly.

Standard Voltage:

HINT
* The output voltage fluctuates up and down, similarly to the diagram, when the wheels are turned slowly.
* A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly.

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

OK -- REPLACE ECM Removal

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

HINT
The output voltage fluctuates up and down, similarly to the diagram, when the wheels are turned slowly.

NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - VSC ACTUATOR WITH ACTUATOR BRACKET ASSEMBLY)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

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

(a) Disconnect the combination meter assembly connector.

(b) Disconnect the VSC actuator with actuator bracket assembly connector.

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE VSC ACTUATOR WITH ACTUATOR BRACKET ASSEMBLY Removal