J35Z1

DTC P2648: Rocker Arm Oil Control Solenoid (VTEC Solenoid Valve) Circuit Low Voltage (Engine Type: J35Z1)




General Description
The variable cylinder management (VCM) system switches the valve timing by opening and closing the oil groove to the cam switching mechanism.

The oil groove is opened and closed by the rocker arm oil control solenoid (VTEC solenoid valve), and the powertrain control module (PCM) controls the VCM system via the rocker arm oil control solenoid (VTEC solenoid valve). The PCM outputs the driving signal and monitors the PCM output terminal voltage level. When an abnormal condition continues for a set time, the PCM detects a malfunction and a DTC is stored.




Monitor Execution Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
The return signal is OFF (Low) for at least 2.0 seconds when the PCM outputs the ON (High) signal to the rocker arm oil control solenoid (VTEC solenoid valve).

Driving Pattern
Start the engine, and let it idle for at least 5 seconds.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the PCM memory.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.