DTC P2648

DTC P2648  : Rocker Arm Oil Control Solenoid Circuit Low Voltage

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

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

   VTEC TEST

   -4. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P2648 Rocker Arm Oil Control Solenoid Circuit Low Voltage

   Is DTC P2648 indicated?

   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 control solenoid and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot .

2. Rocker arm oil control solenoid internal resistance check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Rocker arm oil control solenoid 2P connector

   -3. At the rocker arm oil control solenoid side, measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rocker arm oil control solenoid 2P connector: disconnected
   Test point 1	Rocker arm oil control solenoid 2P connector No. 1 (rocker arm oil control solenoid side)
   Test point 2	Rocker arm oil control solenoid 2P connector No. 2 (rocker arm oil control solenoid side)

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

   Is there 14-30 Ω at room temperature?

   YES 

   Go to step 3.

   NO 

   Replace the rocker arm oil control valve .

3. Shorted wire check (VT SOL line)

   -1. Jump the SCS line with the HDS.

   -2. Disconnect the following connector.

   PCM connector C (51P)

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rocker arm oil control solenoid 2P connector: disconnected
   	PCM connector C (51P): disconnected
   Test point 1	PCM connector C (51P) No. 43
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the VT SOL wire between the rocker arm oil control solenoid and the PCM (C43).

   NO 

   The VT SOL wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P2648 goes away and the PCM was updated, troubleshooting is complete. If DTC P2648 goes away and the PCM was substituted, replace the original PCM .