Diagnostic Detection Logic

DIAGNOSTIC DETECTION LOGIC
Background Information
- The vehicle speed sensor outputs a pulse signal while the vehicle is driven.
- The engine control module checks whether the pulse signal is output.

When a Fault May Be Recorded
- Ignition switch : ON
- Excluding 60 seconds after the ignition switch is turned to ON or immediately after the engine starts.
- Closed throttle position switch : OFF
- Engine speed is 3000 r/min. or more.
- Driving under high engine load conditions.

What Abnormality Sets This Code
Sensor output voltage does not change for 4 seconds (no pulse signal input).

Effect on the Vehicle Systems
No limp-in
Vehicle should run, but may stall when vheicle is stopped.

Probable Causes
- Vehicle speed sensor failed.
- Open or shorted vehicle speed sensor circuit, or loose connector.
- Engine control module failed.

TROUBLESHOOTING HINTS
If there is damaged or disconnected wiring or a short-circuit in the vehicle speed sensor signal circuit, the engine may stall when the vehicle speed is reduced and the vehicle is stopped.