DTC P2647

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

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 , then do the repair verification.

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 INSPECTION 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.

   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 circuit	VTMB1, VTMB1 LG
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector No. 1 (rocker arm oil pressure switch side)
   Test point 2	Rocker arm oil pressure switch A (Bank 1) 2P connector No. 2 (rocker arm oil pressure 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) , then do the repair verification.

4. Open wire check (VTMB1 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 pressure switch A (Bank 1) 2P connector: disconnected
   	PCM connector C (51P): disconnected
   Test circuit	VTMB1
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector No. 2 (PUR)
   Test point 2	PCM connector C (51P) No. 22 (PUR)

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

   Is there continuity?

   YES 

   Go to step 5.

   NO 

   Repair an open in the VTMB1 wire between rocker arm oil pressure switch A (Bank 1) and the PCM (C22), then do the repair verification.

5. Open wire check (VTMB1 LG 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
   Test circuit	VTMB1 LG
   Test point 1	Rocker arm oil pressure switch A (Bank 1) 2P connector No. 1 (BRN)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   The VTMB1 LG 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 VTMB1 LG wire between rocker arm oil pressure switch A (Bank 1) and G101, then do the repair verification.

6. Repair verification

   -1. Reconnect all connectors.

   -2. Exit the SCS mode with the HDS.

   -3. Turn the vehicle to the ON mode.

   -4. Reset the PCM with the HDS .

   Reset PCM

   -5. Do the PCM idle learn procedure .

   -6. Start the engine, and let it idle.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P2647 Rocker Arm Oil Pressure Switch A (Bank 1) Circuit High Voltage

   DTC (PGM-FI)

   Is DTC P2647 indicated?

   YES 

   Check for poor connections or loose terminals at rocker arm oil pressure switch A (Bank 1) 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.