DTC P2648

DTC P2648  : Rocker Arm Oil Control Solenoid Circuit Low Voltage

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Enter the maintenance mode, then start the engine .

   -5. Hold the engine speed at 3000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.

   -6. Do the VTEC TEST in the Function Test Menu with the HDS.

   VTEC TEST

   -7. Check for Pending or Confirmed DTCs with the HDS.

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

   DTC (PGM-FI)

   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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the 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 (male terminals) No. 1 (solenoid side):
   Test point 2	Rocker arm oil control solenoid 2P connector (male terminals) No. 2 (solenoid side):

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

   Is there 13.9-16.9 Ω at room temperature?

   YES 

   Go to step 3.

   NO 

   Replace the rocker arm oil control valve .

3. Shorted wire check (VTS line)

   -1. Jump the SCS line with the HDS, and wait more than 1 minute.

   -2. Disconnect the following connector.

   PCM connector E (80P)

   -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 E (80P): disconnected
   Test point 1	PCM connector E (80P) No. 65
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the VTS wire between the PCM (E65) and the rocker arm oil control solenoid.

   NO 

   The VTS wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P2648 goes away and the PCM was substituted, replace the original PCM .