DTC P2651 (6-Speed A/T, 16-18 9-Speed A/T)

DTC P2651  : Rocker Arm Oil Pressure Switch B (Bank 1) Performance/Stuck off

Special Tools Required 

-Pressure Gauge Adapter 07NAJ-P07010A 

-A/T Low Pressure Gauge w/Panel 07406-0070301 

-A/T Pressure Test Hose 07AAJ-PY4A100 

-A/T Pressure Adapter 07MAJ-PY40120 

-Oil Pressure Hose 07ZAJ-S5AA200 

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .
• If DTC P2653 and/or P2654 are stored at the same time as DTC P2651, troubleshoot those DTCs first, then recheck for DTC P2651.

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 INSPECTION MENU with the HDS, then select the CDVEB TEST with the HDS.

   CDVEB 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 B (Bank 1) 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 - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

   NO 

   The failure is duplicated. Go to step 3.

3. Open wire check (VCMSW line)

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

   - 2. Disconnect the following connector.

   Rocker arm oil pressure switch B (Bank 1) 1P connector

   - 3. Turn the vehicle to the ON mode.

   - 4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Rocker arm oil pressure switch B (Bank 1) 1P connector: disconnected
   Test point 1	Rocker arm oil pressure switch B (Bank 1) 1P connector No. 1
   Test point 2	Body ground

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

   Is there any voltage?

   YES 

   The VCMSW wire is OK. Go to step 4.

   NO 

   Go to step 5.

4. VCM system oil pressure check

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

   - 2. Remove rocker arm oil pressure switch B (Bank 1) (A), and attach the special tools as shown, then attach rocker arm oil pressure switch B (Bank 1) to the oil pressure gauge adapter (B).

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

   - 3. Reconnect the following connector.

   Rocker arm oil pressure switch B (Bank 1) 1P connector

   - 4. Start the engine.

   - 5. Select the VTEC+VCM TEST in the INSPECTION MENU with the HDS, then select the CDVEB TEST with the HDS.

   CDVEB TEST

   Check the oil pressure.

   Is the oil pressure 45 kPa (0.46 kgf/cm 2, 6.5 psi) or more?

   YES 

   Replace the rear rocker arm oil control valve (rocker arm oil control solenoid B (Bank 1)) - Refer to: Rear Rocker Arm Oil Control Valve Removal and Installation .

   NO 

   Inspect the VCM system oil passage. If it is OK, replace the rear rocker arm oil control valve - Refer to: Rear Rocker Arm Oil Control Valve Removal and Installation .

5. Rocker arm oil pressure switch B (Bank 1) internal circuit check

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

   - 2. 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 B (Bank 1) 1P connector: disconnected
   Test point 1	Rocker arm oil pressure switch B (Bank 1) 1P connector No. 1 (rocker arm oil pressure switch side)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Replace rocker arm oil pressure switch B (Bank 1) - Refer to: Rocker Arm Oil Pressure Switch A (Bank 1) and Rocker Arm Oil Pressure Switch B (Bank 1) Removal and Installation .

   NO 

   Repair an open in the VCMSW wire between the PCM (C34) and rocker arm oil pressure switch B (Bank 1).