With Automatic Transmission

Scan Tool 35 (MIL 15) -- Automatic Transaxle:

Trouble Code Number
- Scan tool 35
- General scan tool P0500
- MIL 15

Fault Message
- No Vehicle Speed Sensor Signal

Background
- The vehicle speed sensor serves as a PCM input switching voltage between 0 and 5 volts.
- Once the vehicle is in motion and the throttle is open, information from the sensor is sampled every 11 milliseconds and compared to a minimum threshold equal to 1 mph.
- If the sensors output voltage indicates a speed higher than this threshold the sensor is considered to be operating normally.
- Failure of the sensor would be quite noticeable because the speedometer would fail to operate.
- Diagnostic features that depend on the speed sensor may never execute if this component fails.

Range of Check
- Engine coolant temperature: 83°C (180°F) or more
- Transaxle: Other than N or P range (A/T only).
- 31 seconds after starting engine
- Brakes not applied
- Throttle valve: Open
- Engine: 1,800 r/min or more
- Difference between the atmospheric pressure and intake manifold pressure: 34 kPa (10 in hg) or more

Set Condition
- Vehicle speed: Less than 1 mph for 11 seconds

Probable Cause
- Open or shorted signal circuit
- Speedometer pinion damaged
- Open 9-volt supply circuit
- Open sensor ground circuit
- Vehicle speed sensor failed
- PCM failed