DTC Troubleshooting: P2647 (22)
DTC P2647:
 Rocker Arm Oil Pressure Switch Circuit High Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Check the engine oil level.
Is the level OK?
YES -
Go to Step 2 .
NO -
Adjust the engine oil to the proper level, then go to Step 17 .
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  1. Do the VTEC TEST in the INSPECTION MENU with the HDS.
Is the result OK?
YES -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the ECM.■
NO -
Go to Step 5 .
  1. Check the result of Step 4 .
    • VTEC Switch Failure
    • VTEC Switch Open
    • VTEC Switch SIG Line Open
    • VTEC Switch GND Line Open
Is the test result any of above?
YES -
Go to Step 6 .
NO -
Check for poor connections or loose terminals at the rocker arm oil pressure switch. If it is OK, replace the rocker arm oil control valve, then, go to Step 15 .
  1. Turn the ignition switch OFF.
  1. Disconnect the rocker arm oil pressure switch 2P connector.
  1. At the rocker arm oil pressure switch side, check for continuity between rocker arm oil pressure switch 2P connector terminals No. 1 and No. 2.
Is there continuity?
YES -
Go to Step 9 .
NO -
Replace the rocker arm oil pressure switch, then go to Step 16 .
  1. Turn the ignition switch ON (II).