DTC P0523 (19-21 9-Speed A/T)

DTC P0523  : Rocker Arm Oil Pressure Sensor Circuit High Voltage

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

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	More than 4.79	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 - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

2. 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:

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

   - 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 4.79	V

   Do the current condition(s) match the threshold?

   YES 

   Go to step 3.

   NO 

   Replace the rocker arm oil pressure sensor .

3. Determine possible failure area (SG2 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:

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

   Is there about 5.0 V?

   YES 

   Go to step 5.

   NO 

   Go to step 4.

4. Open wire check (SG2 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. 1:
   Test point 2	PCM connector E (80P) No. 58 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) .

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

   Is there continuity?

   YES 

   The SG2 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) , then recheck. If DTC P0523 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) .

   NO 

   Repair an open in the SG2 wire between the PCM (E58) and the rocker arm oil pressure sensor.

5. Open 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	PCM connector E (80P) No. 36 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021)

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

   Is there continuity?

   YES 

   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 - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) , then recheck. If DTC P0523 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) .

   NO 

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