DTC P0521

DTC P0521  : Rocker Arm Oil Pressure Sensor Out of Range

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. 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	Less than 0.46	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 (OP SENSOR line, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Rocker arm oil pressure sensor 3P connector

   -3. Turn the vehicle to the ON mode.

   -4. Check the parameter (s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   ROCKER ARM OIL PRESSURE SENSOR	Less than 0.46	V

   Do the current condition (s) match the threshold?

   YES 

   Go to step 5.

   NO 

   Go to step 3.

3. Determine possible failure area (rocker arm oil pressure sensor, others)

   -1. 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:

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5.0 V?

   YES 

   Replace the rocker arm oil pressure sensor .

   NO 

   Go to step 4.

4. Open wire check (VCC2 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 E (80P)

   -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 E (80P): disconnected
   Test point 1	Rocker arm oil pressure sensor 3P connector (female terminals) No. 3:
   Test point 2	PCM connector E (80P) No. 76

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The VCC2 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 P0521 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the VCC2 wire between the PCM (E76) and the rocker arm oil pressure sensor.

5. Shorted wire check (OP SENSOR 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 E (80P)

   -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 E (80P): disconnected
   Test point 1	Rocker arm oil pressure sensor 3P connector (female terminals) No. 2:
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Repair a short in the OP SENSOR wire between the PCM (E36) and the rocker arm oil pressure sensor.

   NO 

   The OP SENSOR 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 P0521 goes away and the PCM was substituted, replace the original PCM .