DTC Troubleshooting: P2649
DTC P2649: Rocker Arm Oil Control Solenoid Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2649 Rocker Arm Oil Control Solenoid Circuit High Voltage
      

1.
Problem verification:

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.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2649 Rocker Arm Oil Control Solenoid Circuit High Voltage
      

Is DTC P2649 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:

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)


Is there 14?30 ? at room temperature?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Open wire check (PG3 line):

Open wire check (PG3 line)
?1.
Check for continuity 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. 2
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The PG3 line is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the PG3 wire between the rocker arm oil control solenoid and the G101.?
4.
Open wire check (VTS line):

Open wire check (VTS line)
?1.
Jump the SCS line with the HDS.


?2.
Disconnect the following connector.
PCM connector B (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 B (51P): disconnected
Test point 1
Rocker arm oil control solenoid 2P connector No. 1
Test point 2
PCM connector B (51P) No. 18


Is there continuity?

     
YES
     
     
     
The VTS wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P2649 goes away and the PCM was updated, troubleshooting is complete. If DTC P2649 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the VTS wire between the PCM (B18) and the rocker arm oil control solenoid.?