KX Models

Control System DTCs

DTC Troubleshooting: P2648

DTC P2648 : Rocker Arm Oil Control Solenoid Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information How To Troubleshoot The Fuel And Emissions Systems.

1. Problem verification:

Problem verification
-1. Turn the ignition switch to ON (II.).

-2. Clear the DTC with the HDS.

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

Is DTC P2648 indicated?
-YES- 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 switch, the rocker arm oil control solenoid, and the ECM/PCM.

2. Rocker arm oil control solenoid internal resistance check:

Rocker arm oil control solenoid internal resistance check
-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.





-3. At the rocker arm oil control solenoid side, check for continuity between test points 1 and 2.









Is there 14-30 Ohms at room temperature?
-YES- Go to step 3.
-NO- Replace the rocker arm oil control valve Service and Repair, then do the repair verification.

3. Shorted wire check (VT_SOL line):

Shorted wire check (VT_SOL line)
-1. Jump the SCS line with the HDS.

-2. Disconnect the following connector.





-3. Measure the voltage between test points 1 and 2.









Is there continuity?
-YES- Repair a short in the VT_SOL wire between the rocker arm oil control solenoid and the ECM/PCM (B33), then do the repair verification.
-NO- The VT_SOL wire is OK. Update the ECM/PCM ECM/PCM Update if it does not have the latest software, or substitute a known-good ECM/PCM Service and Repair, then do the repair verification.

Repair verification:

-1. Reconnect all connectors.

-2. Turn the ignition switch to ON (II.).

-3. Reset the ECM/PCM with the HDS How To Troubleshoot The Fuel And Emissions Systems.

-4. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.

-5. Do the VTEC TEST in the INSPECTION MENU with the HDS.

-6. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2648 indicated?
-YES- Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM Service and Repair, then recheck. If the ECM/PCM was substituted, go to step 1.
-NO- Troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.