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P0500

Vehicle Speed Sensor Circuit:




Connectors:




CIRCUIT OPERATION
- A 5-volt voltage is applied to the vehicle speed sensor output terminal (terminal 3) from the PCM (terminal 80). The vehicle speed sensor generates a pulse signal when the output terminal is opened and grounded.

TECHNICAL DESCRIPTION
- The vehicle speed sensor converts the vehicle speed into pulse signals and inputs them to the PCM.
- The vehicle speed sensor outputs a pulse signal while the vehicle is driven.
- The PCM checks whether the pulse signal is output.

DTC SET CONDITIONS

Check Area
- Two seconds or more have passed since the engine was started.
- Closed throttle position switch: "OFF" <3.0L Engine>
- Throttle valve is more open than the idle position <3.5L Engine>
- Engine speed is at between 2,000 and 4,000 r/min.
- Volumetric efficiency is at between 40 and 75 percent.

Judgement Criteria
- Vehicle speed sensor output voltage has not changed (no pulse signal is input) for two seconds.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- Vehicle speed sensor failed.
- Open or shorted vehicle speed sensor circuit, or loose connector.
- PCM failed.

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 1. Using scan tool MB991502, check data list item 24: Vehicle Speed Sensor.
- Check that the speedometer and MUT-II display speed match when traveling at a vehicle speed of 40 km/h (25 mph).

If the displayed speeds do not match, go to Step 2.

If the displayed speeds match, it can be assumed that this malfunction is intermittent. Refer to vehicle level Testing and Inspection.

STEP 2. Check the vehicle speed sensor.
Refer to Combination Meters.

If correct, go to Step 3.

If incorrect, repair or replace the vehicle speed sensor. Then go to Step 9.

STEP 3. Check the power supply line at the vehicle speed sensor connector B-09.
1. Disconnect connector B-09 and measure at the harness side.
2. Turn the ignition switch "ON".




3. Measure voltage between terminal 1 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).

4. Turn the ignition switch "OFF".

If within specifications, go to Step 4.

If not within specifications, check the harness wire and connector between the vehicle speed sensor and the ignition switch, and repair or replace. Refer to vehicle level Testing and Inspection. Then go to Step 9.

STEP 4. Check the ground line at the vehicle speed sensor connector B-09.
1. Disconnect connector B-09 and measure at the harness side.




2. Check for continuity between terminal 2 and ground.
- There should be continuity (0 ohms).

If continuity, go to Step 5.

If no continuity, check the intermediate connector C-29, and repair or replace as needed. Refer to vehicle level Testing and Inspection. If the intermediate connector C-29 is in good condition, repair the harness wire between the vehicle speed sensor connector B-09 and the ground. Then go to Step 9.

STEP 5. Check the output line at the vehicle speed sensor connector B-09.
1. Disconnect connector B-09 and measure at the harness side.
2. Turn the ignition switch "ON".




3. Measure voltage between terminal 3 and ground.
- Voltage should be between 4.8 and 5.2 volts.

4. Turn the ignition switch "OFF".
If within specifications, go to Step 6.

If not within specifications, go to Step 7.







STEP 6. Check harness connector B-09 at the vehicle speed sensor for damage.
If harness connector B-09 is damaged, repair or replace it.

Refer to vehicle level Testing and Inspection.

If harness connector B-09 is in good condition, replace the PCM.

Then go to Step 9.










STEP 7. Check the harness wire between the vehicle speed sensor connector B-09 and PCM connector C-91.

NOTE: Check the wire after checking the intermediate connectors C-11, C-16 and C-29. If the intermediate connectors C-11, C-16 and C-29 are faulty, repair or replace. Refer to vehicle level Testing and Inspection. Then go to Step 8.

If the wire between the vehicle speed sensor connector B-09 and the PCM connector C-91 is not damaged, go to Step 8.

If the wire between the vehicle speed sensor connector B-09 and the PCM connector C-91 is damaged, repair it.

Then go to Step 9.




STEP 8. Check harness connector C-91 at the PCM for damage.
If harness connector C-91 is damaged, repair or replace it.

Refer to vehicle level Testing and Inspection.

If harness connector C-91 is in good condition, replace the PCM.

Then go to Step 9.

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 9. Using scan tool MB991502, check data list item 24: Vehicle Speed Sensor.
Check that the speedometer and MUT-II display speed match when traveling at a vehicle speed of 40 km/h (25 mph).



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