DTC Advanced Diagnostics: P2652 (K20C1) - Honda Civic FC/FK 2016-2021

DTC Advanced Diagnostics: P2652

DTC P2652:Rocker Arm Oil Pressure Switch Stuck on

General Description

The powertrain control module (PCM) controls the switching of the exhaust valve timing by actuating the rocker arm oil control solenoid. The PCM monitors oil pressure in the hydraulic circuit of the VTEC mechanism using the rocker arm oil pressure switch. If the switching is not active despite there is a feedback from rocker arm oil pressure switch, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	5 seconds or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition	Minimum	Maximum
Elapsed time after starting the engine	5 seconds	–
Engine coolant temperature [ECT Sensor 1]	-238.07 °F (-150.04 °C)	302.1 °F (150.06 °C)
Engine oil temperature [Engine Oil Temperature]	49.93 °F (9.96 °C)	5,438.4 °F (3,003.56 °C)
Engine speed [Engine Speed]	80 rpm	–
12 volt battery voltage [Battery]	10 V	15.1 V

[ ]: HDS Parameter

Malfunction Threshold

Despite there is a feedback from rocker arm oil pressure switch, the switching is not active for at least 500 milliseconds.

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 stuck
	Rocker arm oil pressure switch VTMEX line short
	Rocker arm oil control valve failure

Confirmation Procedure

Operating Condition

Start the engine. Hold the engine speed [Engine Speed] at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

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.