DTC Troubleshooting: P0523
DTC P0523: Rocker Arm Oil Pressure Sensor Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0523 Rocker Arm Oil Pressure Sensor Circuit High Voltage
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
ROCKER ARM OIL PRESSURE SENSOR
More than 4.73
V
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil pressure sensor and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Determine possible failure area (rocker arm oil pressure sensor, others):

Determine possible failure area (rocker arm oil pressure sensor, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Rocker arm oil pressure sensor 3P connector

?3.
Connect terminals A and B with a jumper wire.
Terminal A
Rocker arm oil pressure sensor 3P connector (female terminals) No. 1:
Terminal B
Rocker arm oil pressure sensor 3P connector (female terminals) No. 2:


?4.
Turn the vehicle to the ON mode.

?5.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
ROCKER ARM OIL PRESSURE SENSOR
More than 4.73
V
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Determine possible failure area (SG5 line, others):

Determine possible failure area (SG5 line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Remove the jumper wire from the rocker arm oil pressure sensor 3P connector.

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Rocker arm oil pressure sensor 3P connector: disconnected
Test point 1
Rocker arm oil pressure sensor 3P connector (female terminals) No. 1:
Test point 2
Rocker arm oil pressure sensor 3P connector (female terminals) No. 3:


Is there about 5.0 V?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 4.
4.
Open wire check (SG5 line):

Open wire check (SG5 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connector.
PCM connector No. 1 (96P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Rocker arm oil pressure sensor 3P connector: disconnected
PCM connector No. 1 (96P): disconnected
Test point 1
Rocker arm oil pressure sensor 3P connector (female terminals) No. 1:
Test point 2
PCM connector No. 1 (96P) No. 29


Is there 1.0 ? or less?

     
YES
     
     
     
The SG5 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0523 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the SG5 wire between PCM connector No. 1 terminal No. 29 and the rocker arm oil pressure sensor.?
5.
Open wire check (OPSEN line):

Open wire check (OPSEN line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connector.
PCM connector No. 1 (96P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Rocker arm oil pressure sensor 3P connector: disconnected
PCM connector No. 1 (96P): disconnected
Test point 1
Rocker arm oil pressure sensor 3P connector (female terminals) No. 2:
Test point 2
PCM connector No. 1 (96P) No. 47


Is there 1.0 ? or less?

     
YES
     
     
     
The OPSEN wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0523 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the OPSEN wire between PCM connector No. 1 terminal No. 47 and the rocker arm oil pressure sensor.?