DTC Troubleshooting: P2647 (22) (K20Z: M/T)

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 2.


NO - Adjust the engine oil to the proper level, then go to 17.


2.Turn the ignition switch ON (II).

3.Clear the DTC with the HDS.

4.Do the VTEC TEST in the INSPECTION MENU with the HDS.

Is the result OK?


YES - Intermittent failure, sytem 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/PCM.n


NO - Go to 5.


5.Check the result of 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 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 solenoid, then, go to 15.


6.Turn the ignition switch OFF.

7.Disconnect the rocker arm oil pressure switch 2P connector.

8.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 9.


NO - Replace the rocker arm oil pressure switch, then go to 16.


9.Turn the ignition switch ON (II).

10.Measure voltage between rocker arm oil pressure switch 2P connector terminal No. 1 and body ground.

 

Is there battery voltage?


YES - Repair open in the wire between the rocker arm oil pressure switch and G101, then go to 15.


NO - Go to 11.

11.Turn the ignition switch OFF.

12.Jump the SCS line with the HDS.

13.Disconnect ECM/PCM connector C (44P).

14.Check for continuity between rocker arm oil pressure switch 2P connector terminal No. 1 and ECM/PCM connector terminal C22.

 

Is there continuity?


YES - Go to 21.


NO - Repair open in the wire between the ECM/PCM (C22) and the rocker arm oil pressure switch, then go to 16.


15.Turn the ignition switch OFF.

16.Reconnect all connectors.

17.Turn the ignition switch ON (II).

18.Reset the ECM/PCM with the HDS.

19.Do the ECM/PCM idle learn procedure.

20.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2647 is indicated, check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Troubleshooting is complete.n


21.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

22.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2647 is indicated, check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n