DTC P2EC7 (2021)
DTC P2EC7: Cold Start Rocker Arm Oil Control System Problem
General Description
| Logic Decision | Rocker Arm Oil Pressure Switch | |
|---|---|---|
| 'ON' | 'OFF' | |
| Rocker Arm Oil Control Solenoid Command 'OFF' | Normal | Failure |
The cold start emission reduction process controls the air fuel ratio to lean when the engine is cold to lower emissions as the catalyst is not warmed up. If there is a difference between the oil pressure condition in the hydraulic circuit and the status of the rocker arm oil switch as determined by the power control module (PCM), the system is considered faulty, and a DTC is stored.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 7 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery] | 10.5 V | - |
| Engine coolant temperature [ECT Sensor 1] | 14 deg.F (-10 deg.C) | 176 deg.F (80 deg.C) |
| High voltage battery capacity (SOC) | 20 % | |
| Quick warm-up system | Operation | |
| Accelerator pedal position | Released | |
| Other | Vehicle stopped | |
[ ]: HDS Parameter
Malfunction Threshold
When the rocker arm oil control solenoid is OFF, the rocker arm oil pressure switch remains OFF.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Rocker arm oil control solenoid failure
- Rocker arm oil control solenoid VTS line open
- Rocker arm oil control solenoid VTS line short
- Rocker arm oil pressure switch failure
- Rocker arm oil pressure switch VTM line open
- Rocker arm oil pressure switch VTM line short
- Oil passage clogged
Confirmation Procedure
Operating Condition
- Leave the vehicle to cool the engine.
- Enter the maintenance mode, then start the engine, and let it idle for at least 7 seconds.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.