DTC Troubleshooting: P2648 (21) - KE/KG/TR/KQ models

DTC P2648:  Rocker Arm Oil Control Solenoid Circuit Low Voltage (KE, KG, TR, KQ models)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

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

Is the result OK?


YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM.n


NO - Go to 4.


4.Turn the ignition switch OFF.

5.Disconnect the rocker arm oil control solenoid 2P connector.

6.Measure resistance between the rocker arm oil control solenoid 2P connector terminals No. 1 and No. 2.

 

Is there 14-30 W at room temperature?


YES - Go to 7.


NO - Go to 10.

7.Jump the SCS line with the HDS.

8.Disconnect ECM/PCM connector B (44P).

9.Check for continuity between ECM/PCM connector terminal B34 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the ECM/PCM (B34) and the rocker arm oil control solenoid, then go to 11.


NO - Go to 18.


10.Replace the rocker arm oil control valve.

11.Reconnect all connectors.

12.Turn the ignition switch ON (II).

13.Reset the ECM/PCM with the HDS.

14.Do the ECM/PCM idle learn procedure.

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

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2648 is indicated, check for poor connections or loose terminals at 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's troubleshooting.


NO - Go to 17.


17.Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?


YES - Troubleshooting is complete.n


NO - If the screen indicates FAILED, go to 1 and recheck. If the screen indicates NOT COMPLETED, go to 15 and recheck.


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

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

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2648 is indicated, check for poor connections or loose terminals at 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's troubleshooting.


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