Diagnostic Detection Logic

DIAGNOSTIC DETECTION LOGIC
Background Information
- When the engine is running, the camshaft position sensor outputs a pulse signal.
- The engine control module checks whether the pulse signal is input.
- The engine control module checks the pulse signal patterns of the camshaft position sensor.

When a Fault May Be Recorded
- Ignition switch: ON
- Engine speed is approx. 50 r/min. or more.

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

Other Times a Fault May Be Recorded
- Ignition switch: ON
- Engine is not cranking.

Effect on the Vehicle Systems
Vehicle enters Limp-in mode
- Injects fuel into all cylinders simultaneously. (After the ignition switch is turned to ON, the No. 1 cylinder top dead center is not detected at all.)
- Cuts off the fuel supply 4 seconds after a problem is detected. (After the ignition switch is turned to ON, the No. 1 cylinder top dead center is not detected at all.)

Probable Causes
- Camshaft position sensor failed.
- Open or shorted camshaft position sensor circuit, or loose connector.
- Engine control module failed.

TROUBLESHOOTING HINTS
Hint 1: If the camshaft position sensor does not function correctly, correct sequential injection is not being carried out, so that the engine may stall, run irregularly at idle or fail to accelerate normally.

Hint 2: If the sensor outputs a pulse signal when the ignition switch is turned ON (without starting the engine) , the cause is probably a malfunction of the camshaft position sensor or engine control module.