Monitor Description

The ECM optimizes the exhaust valve timing using the Variable Valve Timing (VVT) system to control the exhaust camshaft. The VVT system includes the ECM, cam timing oil control solenoid assembly, camshaft timing gear bolt (camshaft timing oil control valve assembly [for exhaust camshaft]) and camshaft timing exhaust gear assembly. The ECM sends a target duty-cycle control signal to the cam timing oil control solenoid assembly. The camshaft timing gear bolt (camshaft timing oil control valve assembly [for exhaust camshaft]) is operated to control the oil pressure supplied to the camshaft timing exhaust gear assembly based on this signal. The camshaft timing exhaust gear assembly can advance or retard the exhaust camshaft.

If the difference between the target and actual exhaust valve timing is large, and changes in the actual exhaust valve timing are small, the ECM interprets this as the camshaft timing exhaust gear assembly stuck malfunction and stores a DTC.

1. Example:
2. A DTC is stored when the following conditions are met:
   1. It takes 5 seconds or more to change the valve timing by 5°CA.
   2. After the above condition is met, the cam timing oil control solenoid is forcibly activated for 9.5 seconds*1 or 60 seconds*2.

      *1: except Mexico models.

      *2: for Mexico models.

DTC P0014-00 and P0024-00 (Advanced Camshaft Timing) is subject to 2 trip detection logic.

DTC P0015-00 and P0025-00 (Retarded Camshaft Timing) is subject to 1 trip detection logic.

These DTCs indicate that the camshaft timing exhaust gear assembly cannot operate properly due to a camshaft timing gear bolt (camshaft timing oil control valve assembly [for exhaust camshaft]) malfunction or the presence of foreign matter in the camshaft timing gear bolt (camshaft timing oil control valve assembly [for exhaust camshaft]).