DTC Advanced Diagnostics: P2654
DTC P2654:Rocker Arm Oil Control Solenoid B (Bank 1) Circuit High Voltage

General Description

The variable cylinder management (VCM) system switches the valve timing by opening and closing the oil passage to the cam switching mechanism. The oil passage is opened and closed by the rocker arm oil control solenoid B (bank 1), and the powertrain control module (PCM) controls the VCM system via the rocker arm oil control solenoid B (bank 1). The PCM outputs the signal and monitors the PCM output terminal voltage level. When an abnormal condition continues for a set time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Continuous
Sequence
None
Duration
2.0 seconds or more
DTC Type
One drive cycle, MIL on
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
Minimum
Maximum
Battery voltage [BATTERY]
10.0 V
–
No active DTCs set (prevents monitor from running)
P2653
[ ]: HDS Parameter

Malfunction Threshold
The return signal is ON (high) for at least 2.0 seconds when the PCM outputs the OFF (low) signal to rocker arm oil control solenoid B (bank 1).

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 B (bank 1) failure
Rocker arm oil control solenoid B (bank 1) CSS line open
Rocker arm oil control solenoid B (bank 1) CSS line short to power
Rocker arm oil control solenoid B (bank 1) ground line open
PCM internal circuit failure

Confirmation Procedure
Operating Condition
Start the engine, and let it idle for at least 2 seconds.

With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

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 battery.