DTC Advanced Diagnostics: P2651: General Description
| Logic Decision | Rocker Arm Oil Pressure Sensor | |
|---|---|---|
| Low Oil Pressure(Oil pressure ' Threshold) | High Oil Pressure(Oil pressure ' Threshold) | |
| Rocker Arm Oil Control Solenoid Command 'ON' | Normal | Failure (P2651) |
| Rocker Arm Oil Control Solenoid Command 'OFF' | Failure (P2652) | Normal |
The variable cylinder management (VCM) system activates the rocker arm oil control solenoid with a command from the powertrain control module (PCM), and it charges/discharges the hydraulic circuit of the cylinder pause VTEC system mechanism that pauses the intake and exhaust valves on the rear banks. The PCM monitors oil pressure in the hydraulic circuit of the VTEC mechanism using the rocker arm oil pressure sensor downstream of the rocker arm oil control solenoid. If there is a difference between the oil pressure condition in the hydraulic circuit determined by the PCM command and the oil pressure condition determined by the status of the rocker arm oil pressure sensor, the system is considered faulty, and a DTC is stored.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 4.0 seconds or more |
| DTC Type | Two drive cycles, MIL on |