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

OPERATION

Power is supplied to the vehicle speed sensor (terminal No. 3) from the engine control relay (terminal No. 2) and is earthed to the engine-ECU (terminal No. 110) from the vehicle speed sensor (terminal No. 1).
A power voltage of 5 V is applied to the vehicle speed sensor (terminal No. 2) from the engine-ECU (terminal No. 109).

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.

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: B-105 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 B-105 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: A-33X engine control relay connector

Q. Is the check result normal?

	Check intermediate connector A-11, and repair if necessary. If intermediate connector is normal, check and repair harness between A-33X (terminal No. 2) engine control relay connector and B-105 (terminal No. 3) vehicle speed sensor connector. Check power supply line for open/short circuit.

	Repair or replace the connector.

STEP 5. Perform voltage measurement at B-105 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: B-09 engine-ECU connector

Q. Is the check result normal?

	Go to Step 7 .

	Repair or replace the connector.

STEP 7. Check harness between B-105 (terminal No. 2) vehicle speed sensor connector and B-09 (terminal No. 109) engine-ECU connector.

note

Before checking harness, check intermediate connector A-11, and repair if necessary.

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 B-105 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: B-09 engine-ECU connector

Q. Is the check result normal?

	Go to Step 11 .

	Repair or replace the connector.

STEP 11. Check harness between B-105 (terminal No. 1) vehicle speed sensor connector and B-09 (terminal No. 110) engine-ECU connector.

note

Before checking harness, check intermediate connector A-11, and repair if necessary.

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: B-09 engine-ECU connector

Q. Is the check result normal?

	Go to Step 13 .

	Repair or replace the connector.

STEP 13. Check harness between A-33X (terminal No. 2) engine control relay connector and B-105 (terminal No. 3) vehicle speed sensor connector.

note

Before checking harness, check intermediate connector A-11, and repair if necessary.

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 B-105 (terminal No. 2) vehicle speed sensor connector and B-09 (terminal No. 109) engine-ECU connector.

note

Before checking harness, check intermediate connector A-11, and repair if necessary.

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, re-check the trouble symptoms.

Q. Is the check result normal?

	Check end.

	Replace the engine-ECU.