DTC Troubleshooting: P2649
DTC P2649: Rocker Arm Oil Control Solenoid (VTEC Solenoid Valve) (A) Circuit High Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2649 Rocker Arm Oil Control Solenoid (VTEC Solenoid Valve) (A) Circuit High Voltage
      

1.
Problem verification:

Problem verification
?1.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2649 Rocker Arm Oil Control Solenoid (VTEC Solenoid Valve) (A) 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.?
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), or press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
At the rocker arm oil control solenoid side, measure the resistance between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
Rocker arm oil control solenoid A 2P connector: disconnected
Test circuit
VTS, PG
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 (PG line):

Open wire check (PG line)
?1.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
Rocker arm oil control solenoid 2P connector: disconnected
Test circuit
PG
Test point 1
Rocker arm oil control solenoid 2P connector No. 2 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The PG line is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the PG wire between the rocker arm oil control solenoid and the G101, then do the repair verification.
4.
Open wire check (VTS line):

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


?2.
Disconnect the following connector.

?3.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
Rocker arm oil control solenoid 2P connector: disconnected
 
PCM connector B (51P): disconnected
Test circuit
VTS
Test point 1
Rocker arm oil control solenoid 2P connector No. 1 (PNK)
Test point 2
PCM connector B (51P) No. 18 (PNK)


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 do the repair verification.
     
NO
     
     
     
Repair an open in the VTS wire between the rocker arm oil control solenoid and the PCM (B18), then do the repair verification.
Repair verification:

?1.
Reconnect all connectors.

?2.
Exit the SCS mode with the HDS.


?3.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.
Reset the PCM with the HDS.


?5.
Do the PCM idle learn procedure.

?6.
Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2649 Rocker Arm Oil Control Solenoid (VTEC Solenoid Valve) (A) Circuit High Voltage
      


Is DTC P2649 indicated?

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