TECHNICAL DESCRIPTION
The ECM checks the variable valve timing system for malfunction.
DESCRIPTIONS OF MONITOR METHODS
The open timing of the intake valve is faster or slower than the specified value.
MONITOR EXECUTION
Continuous.
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
Sensor (The sensor below is determined to be normal)
- Camshaft position sensor
- Crankshaft position sensor
- Engine coolant temperature sensor
- Throttle position sensor
- Oil feeder control valve
DTC SET CONDITIONS
Check Conditions
- Engine speed is between 594 r/min and 1,500 r/min.
- Engine coolant temperature is between 20°C (68°F) and 88°C (190°F).
- Oil feeder control valve is OFF.
- 1 second has elapsed after the above mentioned conditions have been met.
Judgment Criterion
- The open timing of the intake valve is faster than –1.2°CA (ATDC) for 10 seconds.
or
- The open timing of the intake valve is slower than 16.6°CA (ATDC) for 10 seconds.
FAIL-SAFE AND BACKUP FUNCTION
None.
OBD-II DRIVE CYCLE PATTERN
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Timing chain in out of place.
- Loose timing chain.
- Intake V.V.T. sprocket tooth coming off.
- ECM failed.