Code No. P0500: Vehicle Speed Sensor System <M/T>

OPERATION

Power is supplied to the vehicle speed sensor from the engine control relay and is earthed to the engine-ECU (terminal code SENG) from the vehicle speed sensor.
A power voltage of 5 V is applied to the vehicle speed sensor from the engine-ECU (terminal code V/S).

FUNCTION

The vehicle speed sensor converts the vehicle speed to the voltage, and then input it into the engine-ECU.

TROUBLE JUDGMENT

Check Conditions

More than 2 seconds have passed since the engine starting sequence was completed.
Engine speed is more than 2,000 r/min and is less than 4,000 r/min.
Volumetric efficiency is more than 40 % and is less than 65 %.

Judgment Criterion

Vehicle speed sensor output voltage has not changed (no pulse signal is input) for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

None

PROBABLE CAUSE

Failed vehicle speed sensor
Open/short circuit or harness damage in vehicle speed sensor circuit or loose connector contact
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

Refer to Data List Reference Table .

Item 4: Vehicle speed sensor

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Go to Step 2.

STEP 2. Connector check: Vehicle speed sensor connector

Q. Is the check result normal?

	Go to Step 3.

	Repair or replace the connector.

STEP 3. Perform voltage measurement at vehicle speed sensor connector.

Disconnect connector, and measure at harness side.
Ignition switch: ON
Voltage between terminal No. 3 and earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 5.

	Go to Step 4.

STEP 4. Connector check: Engine control relay connector

Q. Is the check result normal?

	Check and repair harness between engine control relay connector and vehicle speed sensor connector. Check power supply line for open/short circuit.

	Repair or replace the connector.

STEP 5. Perform voltage measurement at vehicle speed sensor connector.

Disconnect connector, and measure at harness side.
Ignition switch: ON
Voltage between terminal No. 2 and earth.

OK: 4.9 - 5.1 V

Q. Is the check result normal?

	Go to Step 9.

	Go to Step 6.

STEP 6. Connector check: Engine-ECU connector

Q. Is the check result normal?

	Go to Step 7.

	Repair or replace the connector.

STEP 7. Check harness between vehicle speed sensor connector and engine-ECU connector (terminal code V/S).

Check output line for open/short circuit.

Q. Is the check result normal?

	Go to Step 8.

	Repair the damaged harness wire.

STEP 8. M.U.T.-III data list

Refer to Data List Reference Table .

Item 4: Vehicle speed sensor

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Replace the engine-ECU.

STEP 9. Perform resistance measurement at vehicle speed sensor connector.

Disconnect connector, and measure at harness side.
Resistance between terminal No. 1 and earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 12.

	Go to Step 10.

STEP 10. Connector check: Engine-ECU connector

Q. Is the check result normal?

	Go to Step 11.

	Repair or replace the connector.

STEP 11. Check harness between vehicle speed sensor connector and engine-ECU connector (terminal code SENG).

Check earthing line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 8.

	Repair the damaged harness wire.

STEP 12. Connector check: Engine-ECU connector

Q. Is the check result normal?

	Go to Step 13.

	Repair or replace the connector.

STEP 13. Check harness between engine control relay connector and vehicle speed sensor connector.

Check power supply line for damage.

Q. Is the check result normal?

	Go to Step 14.

	Repair the damaged harness wire.

STEP 14. Check harness between vehicle speed sensor connector and engine-ECU connector (terminal code V/S).

Check output line for damage.

Q. Is the check result normal?

	Go to Step 15.

	Repair the damaged harness wire.

STEP 15. Replace the vehicle speed sensor

After replacing the vehicle speed sensor, reconfirm whether the diagnosis code is set.

Q. Is the diagnosis code set?

	Replace the engine-ECU.

	Check end.