DTC P2652 (19-21 9-Speed A/T)

DTC P2652  : Rocker Arm Oil Pressure Switch B (Bank 1) Stuck on

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 P2652, troubleshoot those DTCs first, then recheck for DTC P2652.

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

   - 4. Turn the vehicle to the ON mode.

   - 5. 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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

   NO 

   The failure is duplicated. Go to step 3.

3. Shorted wire check (VCMSW line)

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

   - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

   - 3. Disconnect the following connector.

   PCM connector E (80P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector E (80P): disconnected
   Test point 1	PCM connector E (80P) No. 33 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021)
   Test point 2	Body ground

   Is there continuity?

   YES 

   Go to step 5.

   NO 

   Go to step 4.

4. VCM system oil pressure check

   - 1. 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.

   - 2. Reconnect the following connectors.

   PCM connector E (80P)

   Rocker arm oil pressure switch B (Bank 1)

   - 3. Exit the SCS mode with the HDS.

   - 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 - 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. Disconnect the following connector.

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector E (80P): disconnected
   	Rocker arm oil pressure switch B (Bank 1) 1P connector: disconnected
   Test point 1	Rocker arm oil pressure switch B (Bank 1) 1P connector (male terminal) No. 1 (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 a short in the VCMSW wire between the PCM (E33) and rocker arm oil pressure switch B (Bank 1).