SFI System

1GR-FE ENGINE CONTROL: 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 assembly. 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 higher than 9 km/h (5.6 mph). If there is no speed signal from the combination meter assembly 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

HINT
*: 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 and warm it up until the ECT reaches 75°C (167°F) or higher [B].

7. Accelerate the vehicle to 74 km/h (46 mph) or higher [C].

8. Maintain the vehicle speed at 74 km/h (46 mph) or higher for 10 seconds or more [D].

9. Decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform fuel cut [E].

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

10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].

11. Read pending DTCs.

HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.

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

13. Input the DTC: P0500.

14. Check the DTC judgment result.

HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.

15. If the 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
* Various systems use the vehicle speed signal distributed from the combination meter. Check all the components possibly related to speed signal.
* 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 assembly is normal.

OK:

The operation of the speedometer 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 / 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 (ECM - COMBINATION METER ASSEMBLY)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems

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

(a) Disconnect the ECM connector.

(b) Disconnect the combination meter assembly connector.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

HINT
If the wire 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.).

(d) Reconnect the ECM connector.

(e) Reconnect the combination meter assembly connector.

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

4. CHECK COMBINATION METER ASSEMBLY (VOLTAGE)

(a) Disconnect the combination meter assembly connector.

HINT
Disconnect the ECU connectors on the other systems related to the speed signal (but the ECM connectors must be connected).

(b) Turn the ignition switch to ON.

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

Standard Voltage:

(d) Reconnect the combination meter assembly connector.

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

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

(a) Remove the combination meter assembly Removal.

(b) Connect the combination meter assembly connector.

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

(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 the body ground while the wheel is turned slowly.

Standard Voltage:

Text in Illustration

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

(g) Reinstall the combination meter assembly Installation.

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

OK -- REPLACE ECM Removal

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

Text in Illustration

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

(g) Reinstall the combination meter assembly Installation.

NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

7. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU)

(a) Disconnect the skid control ECU connector.

(b) Disconnect the combination meter assembly connector.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

(d) Reconnect the skid control ECU connector.

(e) Reconnect the combination meter assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU)

OK -- REPLACE MASTER CYLINDER SOLENOID Disassembly