DTC Advanced Diagnostics: P0523

DTC P0523:Rocker Arm Oil Pressure Sensor Circuit High Voltage

General Description

The rocker arm oil pressure sensor detects engine oil pressure in the VTEC system. When the voltage from the rocker arm oil pressure sensor is a set value for a specified time, the powertrain control module (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	Two drive cycles, MIL off

Enable Conditions

Condition	Minimum	Maximum
Engine coolant temperature [ECT SENSOR 1]	104 °F (40 °C)	–
Engine speed [ENGINE SPEED]	–	6,000 rpm

[ ]: HDS Parameter

Malfunction Threshold

The rocker arm oil pressure sensor output voltage [ROCKER ARM OIL PRESSURE SENSOR] is 4.79 V or more for at least 2.0 seconds.

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 pressure sensor OPSEN line open
	Rocker arm oil pressure sensor SG line open
	Rocker arm oil pressure sensor failure
	PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.

Conditions for clearing the DTC

The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.