DTC P2647

DTC P2647  : Rocker Arm Oil Pressure Switch A (Bank 1) Circuit High Voltage

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• If DTC P2648 and/or P2649 are stored at the same time as DTC P2647, troubleshoot those DTCs first, then recheck for DTC P2647.

DTC (PGM-FI)

1. Oil level check

   -1. Check the engine oil level .

   Is the level OK?

   YES 

   Go to step 2.

   NO 

   Adjust the engine oil to the proper level .

2. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Select the VTEC+VCM TEST in the Function Test Menu with the HDS, then select the VEB VTEC TEST with the HDS.

   VEB VTEC TEST

   Does the HDS indicate Normal?

   YES 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at rocker arm oil pressure switch A (Bank 1) 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 .

   NO 

   The failure is duplicated. Go to step 3.

3. Rocker arm oil pressure switch A (Bank 1) internal circuit check

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

   -2. Disconnect the following connector.

   Rocker arm oil pressure switch A (Bank 1) 2P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	Rocker arm oil pressure switch A (Bank 1) 2P connector: disconnected
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector (male terminals) No. 1 (switch side):
   Test point 2	Rocker arm oil pressure switch A (Bank 1) 2P connector (male terminals) No. 2 (switch side):

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

   Is there continuity?

   YES 

   Go to step 4.

   NO 

   Replace rocker arm oil pressure switch A (Bank 1) .

4. Open wire check (VTMB1 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 pressure switch A (Bank 1) 2P connector: disconnected
   	PCM connector E (80P): disconnected
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector (female terminals) No. 2:

   Test point 2

   PCM connector E (80P) No. 31

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

   Is there continuity?

   YES 

   Go to step 5.

   NO 

   Repair an open in the VTMB1 wire between the PCM (E31) and rocker arm oil pressure switch A (Bank 1).

5. Open wire check (VTMB1 LG/PHC GND line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Rocker arm oil pressure switch A (Bank 1) 2P connector: disconnected
   	PCM connector E (80P): disconnected
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector (female terminals) No. 1:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   The VTMB1 LG/PHC GND 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 P2647 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the VTMB1 LG/PHC GND wire between rocker arm oil pressure switch A (Bank 1) and G101.