J35Z2

Advanced Diagnostics

DTC P2648: Rocker Arm Oil Control Solenoid A (Bank 1) Circuit Low Voltage (Engine Type: J35Z2)







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, and the powertrain control module (PCM) controls the VCM system via the rocker arm oil control solenoid. 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 1.0 second when the PCM outputs the ON (high) signal to the rocker arm oil control solenoid A (bank 1).

Confirmation Procedure with the HDS
Do the VTEC TEST in the INSPECTION MENU with the HDS.

Driving Pattern
1. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on. 2. Drive the vehicle in a lower gear at 3,300 rpm or more for at least 10 seconds.

- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

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.