DTC Advanced Diagnostics: P2653 (3.5L Engine)
DTC P2653: Rocker Arm Oil Control Solenoid B (Bank 1) Circuit Low 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
| Execution | Continuous |
| Sequence | None |
| Duration | 2.0 seconds or more |
| DTC Type | One drive cycle, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery] | 10.0 V | - |
[ ]: HDS Parameter
Malfunction Threshold
The return signal is OFF (low) for at least 2.0 seconds when the PCM outputs the ON (high) signal to rocker arm oil control solenoid B (bank 1).
Possible Cause
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 short to ground
- PCM internal circuit failure
Confirmation Procedure
Operating Condition
- Start the engine. Hold the engine speed [Engine Speed] at 3, 000 RPM without load (in P or N) until the radiator fan comes on.
- Drive the vehicle at a steady speed of 12 mph (19 km/h) or more at a steady engine speed [Engine Speed] between 1, 220 - 3, 300 RPM for at least 2 seconds
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
Select the VTEC+VCM TEST in the Function Test, then select SOLENOID A of the SOL.V.ACTIVATION with the HDS.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot 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, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.