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 valve pause 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, OBD Status
Execution
Continuous
Sequence
None
Duration
2.0 seconds or more
DTC Type
Two drive cycles, MIL on
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
Minimum
Maximum
Engine coolant temperature
[ECT SENSOR 1]
104 °F (40 °C)
–
Engine speed
[ENGINE SPEED]
–
6,000 rpm
No active DTCs set (prevents monitor from running)
P0117, P0118, P0522
[ ]: 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 OP SENSOR 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, the MIL comes on and a Confirmed DTC and the freeze data are stored.

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.