TECHNICAL DESCRIPTION
The ECM checks the variable valve timing system for malfunction.
DESCRIPTIONS OF MONITOR METHODS
The close timing of the exhaust valve is faster or slower than the specified value.
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
- Engine oil 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).
- Exhaust engine oil control valve is "OFF".
- 1 second has passed after the above mentions have been met.
Judgment Criterion
- The close timing of the exhaust valve is less than -6.0 degrees (ATDC) for 10 seconds.
or
- The close timing of the exhaust valve is more than 14.0 degrees (ATDC) for 10 seconds.
FAIL-SAFE AND BACKUP FUNCTION
OBD-II DRIVE CYCLE PATTERN
- Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 3 .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Timing chain in out of place.
- Exhaust variable valve timing sprocket tooth coming off.
- Exhaust engine oil control valve failed.